Not generic search results. Not forum guesses.
Structured diagnostic thinking from a real RV technician —
to help you find the likely cause, understand your system,
and know what to check next.
Whether you're dealing with a problem right now, trying to understand how something works, or staying ahead of issues — there's a place to start.
01
🚨Something's Wrong Right Now
Urgent Problem Help
RV problems rarely happen at a convenient time. Get calm, structured guidance through the most logical diagnostic steps — so you're not throwing parts at it or making things worse.
Slide stuck outLeveling jacks won't retractNo heat or coolingPower issueAwning won't close
Problems feel less scary when you understand the system. We explain sequences of operation, common failure points, what controls what — in plain English, not service manual jargon.
Leveling system sequenceSlide room mechanics12V vs 120V systemsPropane appliance logic
What is the system doing — or not doing? We start with what you're seeing and experiencing, not assumptions.
02
Separate Likely from Possible
Not every symptom has one cause. We show you the most common patterns a technician would expect first — then what else to rule out.
03
Know What to Test Next
We tell you what to check and why that check matters — so you're moving logically through the system, not randomly.
04
Understand the System
Every diagnosis comes with context — how the system works, what controls what, and why this failure makes sense.
05
Know When to Call a Tech
Sometimes a professional is the right answer. We'll tell you that honestly, and explain what information to have ready.
⚙ Diagnostic Philosophy
"We're here to guide you through the problem, show the most logical and common reasons you may be seeing this failure, and explain what to test next — and why."
This is technician-guided help. Not a magic answer machine. Real diagnostics sometimes don't have one neat answer — boards fail, sensors shift, harness issues happen. We work from what's most likely, not what sounds most reassuring.
📏 Leveling System Rule
Before calibration or any advanced reset: fully retract all jacks and hold retract several seconds after they stop. On fifth wheels, hook to the truck first to remove load from the landing legs before retracting and retrying auto level.
Tool Basics
Using a Multimeter Beginner Guide
A multimeter helps you understand what your RV power is doing. You don't need to be an expert — we'll keep this simple.
⚡
Checking Voltage
Voltage tells you how much electrical pressure is available. In an RV, this helps you understand battery condition and power problems.
01Set your meter to DC Volts (look for a V with a straight line)
02Touch the red probe to + and black probe to − on the battery terminals
03Read the number on the display
~12.6VFully charged battery ✅
~12.0VGetting low — recharge soon
<11.8VVery low — needs attention
Why this matters: Low voltage is one of the most common causes of RV problems that seem unrelated to power.
🔔
Checking Continuity
Continuity tells you if a wire or connection is complete — meaning electricity can flow through it. It helps you find broken connections without guessing.
01Set your meter to the continuity symbol (looks like a sound wave or diode icon)
02Touch one probe to each end of the wire or fuse you're testing
03Listen and watch the display
Beep 🔔Connection is complete — good
No beepBreak in the connection — investigate
When to use this: Checking fuses, testing a wire you think is broken, or confirming a connection before reassembly.
📊
Understanding Amperage
Amperage measures how much power is actually being used or drawn at a given moment. Most beginners don't need to measure this right away — but it helps to understand it.
Think of it this way: Voltage is the pressure in a hose. Amperage is how much water is actually flowing through it.
When amperage matters:
Something is drawing too much power and tripping a breaker
You're trying to find what's draining your battery overnight
You want to confirm a circuit is within its safe limit
Note: Measuring amperage requires connecting the meter differently than voltage. Start with voltage — that covers most beginner situations.
🗓
When Should I Use This?
You don't need a multimeter for every problem — but it gives you real answers instead of guesses. These are the most common situations where it helps.
Battery not charging or draining too fast
No power in part of the RV
Checking if a fuse is blown
Confirming shore power is reaching the RV
Troubleshooting a 12V accessory not working
Checking battery condition before a long trip
Good to know: A basic digital multimeter costs $15–25 and is one of the most useful tools an RV owner can carry.
⚠️Always be careful around electricity. Work on one connection at a time, keep probes away from each other while in use, and if anything feels unsafe — stop and get help from a qualified technician.
Why This Is Different
Better Than Random Search Results
Generic search and forums give you possibilities. We give you technician-pattern thinking — structured, prioritized, honest.
Generic Search / Forums
✕Random possibilities with no priority order
✕No explanation of how the system works
✕Confident-sounding answers that may not fit your situation
✕No guidance on what to test or in what order
✕People throwing parts at the problem
✕Fear-based framing — worst case first
The Pocket RV Tech
✓Likely causes ranked by real-world frequency
✓System education built into every guide
✓Honest about what we can and can't determine remotely
✓Structured next steps with reasoning, not just steps
✓Logic-first: eliminate causes before replacing parts
✓Calm, practical — reduce anxiety while giving real direction
The Pocket RV Tech was built by a Journeyman-certified RV technician with over two decades working on RV systems — everything from leveling systems and slide rooms to propane appliances, 12V wiring, and everything in between.
After years of watching people spend money on the wrong parts, wait weeks for service appointments, and feel completely in the dark about their own rigs — this is the resource that should have existed already.
This is not generic AI content. Not assembled from forum posts. This is real technician pattern recognition — the same thinking that gets applied in a shop bay, put into a format that helps you work through problems yourself.
We don't pretend to have every answer. Hidden issues happen. Sensors shift. Boards fail. The goal is to get you to the most logical place to look first — not to pretend certainty that doesn't exist.
21yr
Hands-on RV industry experience
JM
Journeyman RV Technician certification
3
Entry paths: urgent, learning, maintenance
∞
Free guidance — no paywall for the basics
⚖️
A Note on What We Can and Can't Know
Remote diagnostics have real limits. We can tell you what's most likely based on your symptom, what to test, and what pattern a technician would expect to see. But hidden faults happen — a harness problem, a failed board, a factory defect. We'll always tell you when the logical next step is a professional inspection, and what to tell that technician when you call.
Access Options
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Start with real help at no cost. Upgrade when you need deeper tools.
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Get Started
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Real diagnostic help, no tricks. We believe in earning your trust before asking for anything.
You mentioned a gas smell, smoke, sparks, or burning smell. Do not continue troubleshooting. Do not use any switches or outlets.
Get everyone out of the RV. Ventilate immediately. Contact emergency services or a qualified technician.
Arrival Scenario · Start Here
Just Arrived and Nothing Works?
This is one of the most common situations RV owners run into. Most of the time it's something simple.
We'll check the easy things first — one step at a time.
💡Do you smell gas, smoke, or anything burning? Tap here first if so.
Step 1 of many · Identify the Problem
What's Happening?
Pick the option that sounds closest to your situation. Not sure? Choose the closest match — we'll narrow it down.
Branch A · Step 1 of 4
First Check: Shore Power
Most total blackouts at a campsite come down to one thing — the RV isn't receiving power from the pedestal. This is very common.
Why this matters: Your RV uses campsite power (shore power) for outlets and appliances. If it's not connected, nothing 120V will work.
01
Walk outside and check the power cord
It should be fully plugged into the campsite pedestal. Push it in firmly — a loose plug is more common than you'd think.
Branch A · Quick Fix
Plug In and Try Again
Connect the power cord fully to the pedestal. Push it in firmly — it should seat all the way and feel secure.
💡 What most people miss
Make sure you're plugged into the correct amp service — 30-amp and 50-amp receptacles look similar but are different. Also check that the pedestal breaker is in the ON position before connecting.
Branch A · Step 2
Check the Pedestal Breaker
At the campsite power pedestal, there's a breaker for your outlet. It can trip from a surge or previous camper — and it looks like it's still on when it isn't.
01
Find the breaker on the pedestal
It's a switch or breaker near the outlets on the post.
02
Flip it fully OFF, then back ON
Don't just check it — reset it. A tripped breaker often looks "on" but sits in the middle.
✅
That Fixed It
A tripped pedestal breaker is the most common cause of total power loss at a campsite. You're good to go.
💡 Good to know
If the breaker trips again shortly after, you may be pulling more power than the site provides. Check if high-draw appliances (AC, microwave, electric water heater) are running at the same time.
Branch A · Step 3 of 4
Check the RV Main Breaker
Inside your RV there's a breaker panel. A tripped breaker stops power to everything downstream — even if shore power is fine.
Why this matters: One tripped breaker inside your RV can kill all outlets and lights on that circuit.
01
Find your RV breaker panel
Check near the entry door, under a dinette seat, in a bedroom cabinet, or behind a panel near the water heater.
02
Look for any tripped breaker
A tripped breaker sits in the middle — not fully on or off. Reset it fully off first, then back on.
✅
Breaker Reset
A tripped interior breaker is common after a surge or overload. Power should be restored to those circuits now.
💡 If it trips again
A breaker that keeps tripping is telling you something is overloaded or there's a fault in that circuit. Don't keep resetting it — that's when a technician should take a look.
Branch A · Step 4 of 4
Check the Battery Disconnect Switch
Most RVs have a battery disconnect switch. If it's off, your 12V system won't work — even with shore power connected. This is very commonly left off after storage or towing.
Why this matters: Lights, slides, and other 12V systems won't respond if the disconnect is off.
01
Find the disconnect switch
Common locations: battery compartment, entry step area, outside storage bay, or a panel near the main entry.
02
Make sure it's switched ON
Some are a physical knife switch, some are a push button, some are a rotary knob. It should be in the connected/on position.
✅
That Was It
Battery disconnect left off after travel or storage — happens all the time. Your 12V system should be back online now.
Branch A · Step 4 of 4 · Deeper Issue
Likely a Battery or Converter Issue
You've checked the main causes. Here's what's most likely happening at this point:
A
Dead or heavily discharged batteries
Low battery voltage can prevent the RV from responding even when shore power is connected.
B
Failed converter
The converter turns shore power into 12V and charges your batteries. If it's failed, your 12V side won't work.
C
Blown main fuse
Check the main 12V fuses near the battery bank — a blown fuse here can cut the whole 12V system.
⚙ Before you call a tech — tell them:
Shore power amperage you're using · whether the converter fan runs at all · approximate age of your batteries. This saves time on the service call.
Branch B · Lights OK · Outlets Dead
Lights Work, But Outlets Don't
This is very common. Your RV lights and outlets don't always run the same way. We'll check the simple things first.
✅The lights being on is actually a good sign — it tells us part of the system is working.
Branch B · Step 1 of 5 · Understanding
Why This Happens
In most RVs, lights can run on battery power. Most outlets need shore power or inverter power. That means part of the RV can work while another part does not.
Why this matters: Knowing this tells us exactly where to look — the 120V side of your system, not the batteries.
Branch B · Step 2 of 5
Are You Plugged Into Campsite Power?
If you're not plugged into shore power, your outlets usually won't work. Let's start there.
Why this matters: Shore power is what runs 120V outlets. Without it, most outlets in the RV stay dead even if the lights are on.
Branch B · Not Plugged In
Plug In and Test Again
Your lights may still work from battery power. Your outlets usually need shore power. Plug in your power cord, then test an outlet again.
💡 Quick tip
Push the plug in firmly — a half-seated cord can power some things but not others. Also check that the pedestal breaker is switched on before you test.
✅
Good News
That was the issue. This is one of the most common beginner RV power mix-ups — lights run on batteries, outlets need shore power.
Branch B · Step 3 of 5
Check the Campground Pedestal Breaker
The campground power post usually has its own breaker. If it's off or tripped, your RV may be plugged in but still not getting power.
Why this matters: A tripped pedestal breaker is one of the most common causes of dead outlets — even when you're plugged in.
Branch B · Pedestal Explained
What to Look For
The pedestal is the power box at your campsite — the post you plugged your cord into. Open the cover and look for a breaker switch, similar to a house breaker.
01
Find the breaker switch inside the pedestal
It will be labeled by amp (30A or 50A). It should be in the full ON position.
02
Flip it fully OFF, then back ON
A tripped breaker often looks "on" but sits slightly in the middle. Always reset it — don't just check it.
Branch B · Step 3 of 5
Did That Fix It?
After checking or resetting the pedestal breaker — do your outlets work now?
✅
Great
The RV was plugged in, but campground power wasn't actually getting through. You found a very common problem.
Branch B · Step 4 of 5
Next: Check the Reset Outlet
One reset outlet can shut off several outlets in your RV. This is another very common cause of dead outlets that most people miss.
Why this matters: RVs use GFCI outlets for safety. One tripped GFCI can cut power to an entire group of outlets in the bathroom, kitchen, or outside.
Branch B · Step 4 of 5
Check for a Reset Outlet
Look for an outlet with small TEST and RESET buttons. It's often in the bathroom, kitchen, or outside compartment.
01
Find the outlet with TEST / RESET buttons
Check every room — bathroom and kitchen are the most common spots.
02
Press RESET firmly
It should click in and stay. If it pops back out, there's still a fault on that circuit.
Branch B · Step 4 of 5
Press RESET
Press the RESET button firmly. Then test the outlets again.
💡This is one of the most commonly missed causes of dead outlets — don't feel bad if this is it.
✅
Nice Work
That reset outlet was protecting the others. This is one of the most common outlet problems in an RV — and one of the easiest to fix.
Branch B · Step 5 of 5
Let's Check One More Thing
If your RV has an inverter, it may affect certain outlets. We'll check that next.
Branch B · Step 5 of 5
Does Your RV Have an Inverter?
Some RVs use an inverter to power certain outlets. If it's off or not passing power through, some outlets may stop working.
💡 Not sure if you have one?
Look for a panel or switch labeled "Inverter" or "Inverter/Charger" — often near the main panel or in a storage bay. Many newer RVs have one built in.
Branch B · Inverter Check
Check Whether the Inverter Is On
Make sure the inverter is powered on and doesn't show a fault or error light. Then test the outlet again.
Why this matters: Some outlets in your RV are wired through the inverter. If the inverter is off or in fault, those outlets won't work even with shore power connected.
✅
Good Catch
That outlet depended on inverter power or inverter pass-through. Now that the inverter is on, it's working correctly.
Branch B · Breaker Panel
Check the RV Breaker Panel
The main breaker panel controls 120V power in the RV. A tripped breaker can shut off outlets in one area or throughout the whole RV.
Why this matters: Even if shore power and the pedestal are fine, a tripped breaker inside the RV will stop power to the circuits it protects.
Branch B · Breaker Panel Explained
What It Looks Like
It usually looks like a small house-style breaker panel inside the RV. Check for any breaker not fully in the ON position.
01
Common locations
Near the entry door, under a dinette seat, in a bedroom cabinet, or behind a panel near the water heater.
02
Look for any breaker in the middle position
A tripped breaker sits halfway — not fully on or off. Flip it fully OFF first, then back ON.
Branch B · Breaker Panel
Did Resetting a Breaker Fix It?
✅
Great
A tripped breaker was stopping power to those outlets. You found it and fixed it — well done.
💡 If it trips again
A breaker that keeps tripping means something is overloaded or there's a fault in that circuit. Don't keep resetting it — that's a job for a technician.
Branch B · Next Steps
You've Checked the Main Causes
Your lights working tells us the battery side is at least partly active. Since outlets still don't work after the main checks, this may need a technician to look at it in person.
⚙ Tell the technician
Lights work but outlets don't. You already checked: shore power connection, pedestal breaker, reset outlet (GFCI), inverter, and main breaker. That information saves time and helps them arrive prepared.
Branch C · Step 1 of 3
AC and Microwave Need More Power
AC units and microwaves draw a lot of power. They need a dedicated breaker — and enough amperage from your campsite hookup to run at all.
Why this matters: On a 30-amp connection, running AC alone can use most of your available power. A 50-amp site gives you much more headroom.
Branch C · Step 1
What Amperage Are You Connected To?
Branch C · 30-Amp
30-Amp Has Limits
On 30-amp service, you have roughly 3,600 watts total. A single rooftop AC unit uses 1,500–2,000 watts. Running the AC and microwave together can easily trip the breaker.
01
Turn off other high-draw items first
Electric water heater, second AC, electric heat strip — turn them off before trying the AC or microwave.
02
Check the dedicated breaker for AC
The AC unit usually has its own breaker in the panel — look for one labeled AC, Air, or by roof unit location.
03
Using a 30-to-50 amp adapter?
An adapter doesn't increase power — you're still limited to 30 amps. A 50-amp RV on 30-amp will have reduced capability.
Branch C · 50-Amp
On 50-Amp — Check the Dedicated Breaker
On 50-amp service you have plenty of power for AC and microwave simultaneously. If they're still not working, the issue is likely a tripped breaker or a fault in the appliance itself.
01
Find and reset the AC breaker
In your RV breaker panel — flip it fully off, then back on.
02
Check the thermostat / control panel
Make sure the AC is set to a temperature that requires cooling and the fan is set to AUTO or ON.
Branch C · Next Steps
Likely an Appliance or Circuit Fault
If you've confirmed power is available and the breaker is fine, the issue is likely inside the appliance itself or in the wiring feeding it.
⚙ Before you call a tech
Note: the exact appliance not working, your shore power amperage, whether the appliance makes any sound when you try it, and any error codes on the thermostat or display.
Branch D · Water System
How Are You Getting Water?
RVs can use two different water sources. The checks are different for each — pick the one that applies.
Branch D · City Water
City Water Quick Checks
01
Is the spigot turned on?
The campsite water spigot valve — turn it fully on counterclockwise.
02
Is the hose kinked?
Walk the hose and straighten any kinks. A single kink can stop flow completely.
03
Check your pressure regulator
Most RVers use an inline pressure regulator. If it's failed or clogged, it can block flow entirely. Try removing it temporarily to test.
04
Is your water pump switched off?
When on city water, the pump should be off. But a stuck-open pump bypass valve can sometimes interfere. Check that the pump switch is off.
Branch D · Fresh Tank + Pump
Fresh Tank Quick Checks
01
Is the fresh tank actually filled?
Check the tank monitor panel. A pump running a dry tank will burn out — so this check matters.
02
Is the water pump switched ON?
Look for a pump switch on the control panel — often labeled "Water Pump" or "Pump." It must be on for tank water to work.
03
Do you hear the pump running?
Turn on a faucet and listen. You should hear a brief hum or buzzing when the pump kicks on.
Branch D · Pump Runs, No Flow
Pump Runs But No Water
If the pump runs but nothing comes out, the most likely causes are a dry tank, a closed valve somewhere in the line, or a winterization bypass that wasn't reversed.
💡 Winterization check
If the RV was recently de-winterized, check that all bypass valves are returned to normal position. Pink antifreeze in lines can also cause temporary low flow until it's flushed.
Branch D · No Pump Sound
Pump Isn't Running at All
If you don't hear any pump sound, the pump isn't getting power. This is usually a simple fuse or the pump switch not being engaged.
01
Check the pump fuse
Find the 12V fuse panel and look for a fuse labeled "Water Pump" or "Pump." A blown fuse is cheap and easy to replace.
02
Verify 12V power is on
The pump runs on 12V. Make sure the battery disconnect is on and batteries have charge.
Branch D · Next Steps
Water System Needs Closer Inspection
You've worked through the common causes. At this point the issue may be a failed pump, a closed valve in an unusual location, or a plumbing fault that needs hands-on diagnosis.
⚙ Before you call a tech
Be ready to say: city water or tank, whether the pump runs or not, your water tank level, and whether the RV was recently winterized. This helps a tech arrive prepared.
Branch E · Different Issue
Let's Find a Starting Point
No problem. Start with these three quick checks — they solve more problems than you'd expect.
01
Battery disconnect is ON
Often left off after storage or towing. Check the battery compartment or entry area.
02
Shore power cord is plugged in and pedestal breaker is ON
Confirm the cord is fully seated and the pedestal breaker hasn't tripped.
03
Check your control panel for error codes
Write down any codes you see — they're valuable for diagnosis.
Take a breath — this is usually something simple. We'll check the most common causes step by step.
✅The pump running is actually a good sign — it means power is reaching it.
Water Pump · Step 1 of 4
Is Your Fresh Water Tank Filled?
The pump pulls water from your tank. If the tank is empty, nothing will come out — even if the pump runs perfectly.
Why this matters: Running a pump dry can damage it over time. Always check the tank level first.
Water Pump · Fill First
Fill the Tank and Try Again
Fill your fresh water tank, then turn on a faucet and test again.
💡 Quick tip
After filling, it may take a few seconds for the pump to prime and push water through the lines. Leave the faucet open for 20–30 seconds.
✅
Good News
Empty tank — that's one of the most common causes. You found it quickly.
Water Pump · Step 2 of 4
Does the Pump Run Continuously?
When you open a faucet, listen carefully to the pump. Does it run non-stop without stopping, or does it run briefly then stop?
Why this matters: A pump that runs non-stop usually means it can't build pressure — often air in the lines or a blockage. A pump that won't run at all is a different issue.
Water Pump · Step 3 of 4
Likely Air in the Lines
When air gets trapped in the water lines, the pump runs continuously but can't build pressure to push water out. This is very common after filling an empty tank.
Why this matters: Opening a faucet fully lets the pump push the air out and prime the system with water.
01
Open a faucet fully
Turn the hot and cold on fully and let it run for at least one full minute.
02
Be patient — it may sputter first
You may hear spitting or see bursts of air. That's normal — it's the air being pushed out.
✅
Air Purged — Fixed
Air in the lines is very common after filling a tank or any time the system runs dry. All sorted.
Water Pump · Step 4 of 4
Check the Water Filter
A clogged or blocked inline water filter can restrict flow enough that the pump can't push water through. This is easy to miss.
Why this matters: Even a partially clogged filter can drop pressure to nearly nothing.
Water Pump · Filter Location
What to Look For
The inline water filter is usually near the water pump or along the water line coming from the tank. It's a small canister — often white or clear.
01
Look near the pump
Check around the fresh water pump in the utility bay or under a cabinet.
02
Check if it looks dirty or blocked
If it's visibly discolored or clogged, try bypassing or replacing it temporarily to test.
Water Pump · Filter Check
Did That Fix It?
✅
Clogged Filter Fixed It
A blocked filter was stopping the flow. Replace or clean it — and consider checking it seasonally.
Water Pump · Step 3 of 4
Check the Pump Power
If the pump runs weakly or barely at all, it may not be getting enough power — or the pump switch may not be fully on.
Why this matters: A pump needs solid 12V power to build proper water pressure. A weak connection or blown fuse can cause low or no flow.
Water Pump · Power Check
What to Check
01
Make sure the pump switch is fully ON
Look for a switch labeled "Water Pump" or "Pump" on your control panel. It must be in the ON position.
02
Check the pump fuse
Find your 12V fuse panel and look for a fuse labeled "Water Pump." A blown fuse is cheap and easy to replace.
03
Check battery disconnect is ON
The pump runs on 12V. If the battery disconnect is off, the pump won't get power at all.
Water Pump · Power Check
Did That Fix It?
✅
Power Issue Fixed It
A switch, fuse, or disconnect was cutting power to the pump. Good catch — that's a common and easy fix.
Water Pump · Next Steps
You've Checked the Main Causes
This is likely a deeper issue — a failed pump, a stuck valve, or a plumbing fault that needs hands-on inspection. You've already done more than most RV owners would.
⚙ Tell the technician
Pump runs but no water comes out. You already checked: tank level, air purging, inline filter, pump switch, fuse, and battery disconnect. That saves time on the service call.
Battery · Start Here
Battery Draining or Not Holding Charge
This is one of the most common RV battery complaints. The first thing a technician does is figure out when it drains — because each situation points to a completely different type of problem.
What this tells us:
· Drains while sitting → battery age or a hidden draw
· Drains while in use → high load or not enough charge
· Not charging while plugged in → converter or connection issue
⚠ Common mistake
Many owners assume the battery is bad — when it's actually just not being charged properly. We'll check the charging side first before drawing any conclusions about the battery itself.
Battery · Sitting Drain · Step 1 of 4
Check the Battery Disconnect Switch
When your RV is stored, is the battery disconnect switch turned OFF? Many RVs still draw a small amount of power even when everything looks "off."
Why this matters: Even a small constant draw — as little as a few milliamps — will drain a battery completely over days or weeks. This is the first thing any tech would ask about.
💡This is one of the most overlooked storage habits. A lot of owners don't know the disconnect should be turned off.
Battery · Quick Fix First
Turn the Disconnect OFF When Stored
Turn the battery disconnect OFF every time you store the RV. Then recharge the battery fully and test again after a week.
💡 Where to find it
Common locations: outside storage bay near the battery, step area, or a switch panel inside near the entry door. It may be a knife switch, push button, or rotary knob.
✅
Simple Fix
Leaving the disconnect on was allowing a slow drain over time. Turning it off during storage is one of the best habits an RV owner can build.
Battery · Sitting Drain · Step 2 of 4
Check for Hidden Power Draws
Even with the disconnect ON, some items draw power constantly. Has the battery been sitting connected for more than a few days?
Technician thinking: If the battery drains with the disconnect on, something is bypassing it. That points to a faulty component or a wiring issue drawing more than it should. We're narrowing this down step-by-step.
01
Propane / LP detector
Always-on safety device. Draws a small but constant amount of 12V power — this is normal and expected.
02
Stereo memory / radio
Keeps presets and clock active — small but constant draw.
03
Control boards and slide / leveling controllers
Some stay awake and draw power even when not in use. A faulty board can draw far more than normal.
💡 Best practice
If storing for more than a few days, use the battery disconnect. If it still drains with the disconnect OFF, there's a component bypassing the disconnect — that needs a technician with an ammeter to track down.
Battery · Sitting Drain · Step 3 of 5
Optional: Check Battery Voltage
If you have a multimeter, this is a good moment to check what the battery is actually doing. You don't need one — but if you have it, this step gives you real information instead of guesses.
What this tells us: Voltage at rest tells you whether the battery still holds a charge at all. A battery reading below 12.0V after sitting fully disconnected has likely lost significant capacity — regardless of age.
~12.6VFully charged — battery is healthy
~12.0VLow — needs charging before testing
<11.8VVery low — battery may be failing
💡 How to check
Set the multimeter to DC Volts. Touch red probe to the + terminal and black to the − terminal. Read the display. See the Multimeter Basics guide on this site if you need step-by-step help.
Battery · Sitting Drain · Step 3 of 4
How Old Is the Battery?
Battery age is one of the most overlooked causes of drain problems. An old battery may still work — but it can't hold much charge anymore, and it gives it up fast.
Technician thinking: At this point we've ruled out the disconnect habit and visible draws. If those are fine, the battery itself is the next most likely culprit. Age is the quickest indicator of whether it's worth keeping.
1–2 yrsShould be holding well
3–4 yrsWatch for performance drops
5+ yrsLikely end of useful life
🔧 Optional: Voltage check
If you have a multimeter, this is a good time to check battery voltage. Set it to DC Volts and touch the probes to the terminals. A healthy resting battery reads ~12.6V. Below 12.0V at rest means it's already low or failing to hold charge. See the Multimeter Basics guide on this site for help with this step.
Battery · Sitting Drain · Summary
You've Checked the Right Things
You've worked through this the same way a technician would — starting with the simplest causes and moving toward deeper ones.
✅Most people wouldn't know to separate storage drain from in-use drain. You're checking the right things first.
✓
You've now checked:
Battery disconnect habit · Hidden draws (propane detector, stereo, control boards) · Battery voltage at rest · Battery age
→
If still draining, the likely remaining causes are:
Battery capacity has declined with age · A component is drawing more than it should (needs ammeter test) · A wiring fault bypassing the disconnect
✓
Use the disconnect every time you store
This alone prevents most storage drain problems.
✓
Fully charge before storing
A partially charged battery deteriorates faster.
✓
Replace if 4+ years old
At that age, a new battery often resolves persistent drain issues immediately.
⚙ If calling a technician
Tell them: battery drains while sitting. You already checked: disconnect habit, common parasitic draws, resting voltage, and battery age. Whether it drains with the disconnect ON or OFF. That tells them exactly what's already ruled out — and where to focus next.
Battery · In-Use Drain · Step 1 of 4
Are You Plugged Into Shore Power?
This is the first thing a technician would ask. Whether you're plugged in or not completely changes where the problem is coming from.
Technician thinking: If plugged in but still draining — that points to a charging failure (converter). If on battery only — that points to high load or a battery that can't hold enough charge. Two very different paths.
Battery · In-Use Drain · Step 2 of 4
Check the Converter
The converter turns shore power into 12V and charges your battery while plugged in. If it's not working, the battery drains — even with the cord connected.
Technician thinking: A battery draining while plugged in is almost always a converter problem. Either it's failed, it has a blown fuse, or it's not producing enough output voltage to charge. This is a very common and fixable issue.
01
Are your lights dimming while plugged in?
Dimming 12V lights while on shore power is a reliable sign the converter isn't keeping the battery charged.
02
Does the converter fan run?
The converter usually has a small cooling fan. Completely silent when plugged in usually means it's not operating.
03
Check the converter fuse or breaker
Converters often have a dedicated fuse. A blown fuse cuts all charging output completely — and is a quick easy fix.
🔧 Optional: Voltage check while plugged in
If you have a multimeter, check battery voltage while plugged into shore power. Set to DC Volts, touch probes to battery terminals.
· 13.0–13.8V = converter is charging ✅
· ~12.6V or lower while plugged in = converter is NOT charging
If voltage does not rise when plugged in, that confirms the converter is the problem — not the battery itself. This is the most common mistake: replacing a good battery when the converter is the real issue.
Battery · Converter Issue
Likely a Converter Problem
A converter that isn't charging means the battery is doing all the work — even while you're plugged in. The good news: this is a well-understood and fixable problem.
✅You've already done the right diagnostic step. Knowing it's a converter issue saves a lot of time when you call a technician.
⚙ Tell the technician
Battery drains while plugged into shore power. Lights dim when using 12V items. Converter fan may not be running. You already ruled out: pedestal power, cord connection, and basic shore power delivery. Battery age if known. That tells them exactly where to start — and rules out a lot of the guesswork.
Battery · In-Use Drain · Step 3 of 4
Check What's Drawing Power
On battery only, some systems draw a lot more power than people expect. Running several things at once can drain even a healthy battery quickly.
Technician thinking: Before assuming the battery is bad, it's worth eliminating the load as the cause. A normal battery draining fast under high load is not a battery problem — it's a usage problem. This step separates those two possibilities.
01
Furnace / heater
The furnace blower fan draws significant 12V power every time the heat cycles on. Cold nights with a running furnace can drain a battery by morning.
02
Inverter
An inverter running appliances off battery can drain it very quickly. Even when idle, many inverters draw power just being on.
03
Lighting — especially older incandescent bulbs
Incandescent fixtures draw much more power than LED. Multiple lights running overnight adds up fast.
💡 Quick test
Turn off everything you can and observe. Then switch items on one at a time. If the battery drops noticeably when one item comes on — that's your high draw. This is exactly how a technician isolates a load problem.
Battery · In-Use Drain · Step 4 of 4
Check Battery Terminals and Connections
Loose or corroded battery terminals can prevent the battery from charging properly — even when everything else is fine.
Why this matters: Corrosion creates resistance. That resistance means less charging current reaches the battery, and power can't flow out efficiently either.
01
Look at the terminals visually
White or bluish-green buildup on the terminals is corrosion. It needs to be cleaned off.
02
Try to wiggle the terminal clamps
They should be completely firm. Any movement means the connection is loose.
Battery · Connection Issue
Clean the Terminals
Corrosion can be cleaned with a wire brush or a baking soda and water mix. Tighten any loose clamps after cleaning. Then retest.
⚙ Safety note
Always disconnect the negative (−) terminal first and reconnect it last. Work carefully and avoid shorting the terminals together.
✅
Connection Fixed It
Corroded or loose terminals are a very common cause of charging and drain problems. Clean connections make a real difference.
💡 Going forward
Apply a thin coat of dielectric grease or terminal protector spray after cleaning to slow future corrosion buildup.
Battery · In-Use Drain · Summary
You've Checked the Most Common Causes
You've done this in the right order — the same way a technician works through it. That means anything remaining is a deeper issue, not a beginner miss.
✓
You've now checked:
Shore power connection · Converter operation (fan, dimming, fuse) · High-draw load (furnace, inverter, lights) · Battery terminal condition · Voltage while plugged in (if multimeter available)
→
If still not resolved, the likely remaining causes are:
Battery capacity has degraded and can't hold enough charge · Converter is failing to charge properly · A wiring or connection issue reducing charging efficiency
✅At this point you've ruled out the most common beginner-level causes. What remains is deeper electrical testing — that's a technician's job, not something to troubleshoot alone.
⚙ Tell the technician
Battery drains while in use. Already ruled out: shore power delivery, converter operation (fan running, no dimming lights), high-load items, terminal condition. Whether plugged in or on battery only. Battery age if known. Voltage reading if you took one. This saves significant diagnostic time — they can go straight to deeper testing instead of starting from zero.
Furnace · Start Here
Furnace Fan Runs, But No Heat
Take a breath — this is a very common RV furnace complaint. The fan starting tells us part of the system is working. Now we need to figure out what is stopping ignition.
✅The fan running is actually helpful information. It means power is reaching the furnace — the issue is in the ignition sequence, not a complete failure.
Furnace · Step 1 · Identify Symptom
What Is the Furnace Doing?
Choose the option that sounds closest. This helps separate airflow problems from ignition problems — they point to different causes.
Furnace · Branch A · Step 1 of 4
Check Propane Supply
The furnace needs propane to ignite. If propane is off or the tank is empty, the blower may run — but no flame will ever start.
What this tells us: If propane is the issue, it means the furnace is missing fuel — not power. The fan running correctly actually confirms the electrical side is working.
Furnace · Propane Fix First
Restore Propane and Try Again
Turn on the propane valve or refill the tank. Then set the thermostat a few degrees above the current temperature and wait about 30 seconds for the furnace to cycle.
💡 After restoring propane
It can take a minute or two for propane pressure to fully restore in the lines. If the first ignition attempt fails, try once more before moving on.
✅
Propane Was the Issue
No propane means no ignition — the fan will still run but the flame can never start. One of the most common furnace complaints has one of the simplest fixes.
Furnace · Branch A · Step 2 of 4
Check Other Propane Appliances
Try the stove burner or water heater if it's safe to do so. If they also fail to work, the problem may be propane delivery — not the furnace itself.
What this tells us: If other propane appliances work fine, the furnace is isolated as the issue. If nothing propane works, we're looking at a supply problem — regulator, valve, or low tank.
Furnace · Propane Supply Issue
Likely a Propane Supply Problem
When no propane appliances work, the issue is upstream of the furnace — not in the furnace itself. Common causes: tank is actually empty, main valve is closed, regulator has tripped, or a line issue.
01
Check tank gauge and main valve
Main valve should be fully open (counterclockwise). Tank gauge should show fuel.
02
Check if the regulator has tripped
Some regulators have a safety trip that requires resetting. Turn all appliances off, close the tank valve, wait 30 seconds, then slowly reopen.
Furnace · Branch A · Step 3 of 4
Battery Voltage Matters Here
RV furnaces need good 12V power even when burning propane. Low battery voltage can let the fan run but prevent the ignition sequence from completing.
What this tells us: This is one of the most common hidden causes — the furnace appears to be trying, but the control board or igniter isn't getting enough voltage to finish the job.
Furnace · Voltage Check
Check Battery Voltage
Set your multimeter to DC Volts. Touch the red probe to the + battery terminal and black to the −. Read the display.
~12.6VStrong — battery is not the issue
~12.0VLow — may affect furnace ignition
<11.8VVery low — charge before testing furnace
💡 Why voltage matters for furnace
Most RV furnaces need at least 10.5V to complete ignition. Below that, the control board may run the fan but refuse to open the gas valve or fire the igniter. See the Multimeter Basics guide on this site for help.
Furnace · Low Voltage
Charge the Battery and Retest
Charge or shore-power the battery first, then try the furnace again. A lot of furnace "failures" resolve completely once voltage is restored.
💡 Good to know
Running the furnace on a low battery is a very common reason it won't ignite. The fan motor runs at lower voltage — but the ignition circuit often needs closer to full voltage to operate correctly.
✅
Low Voltage Was the Issue
Low battery voltage preventing furnace ignition is one of the most commonly missed causes — and one of the easiest to fix. Good catch.
Furnace · Branch A · Step 4 of 4
Check Airflow
If the blower runs but airflow is weak, the furnace may not allow ignition. Dust, pet hair, or a blocked return can affect a small switch inside the furnace.
What this tells us: RV furnaces use a sail switch — a small flap that confirms airflow is present before allowing gas and ignition. No airflow signal = no ignition, even if everything else is fine.
01
Check the furnace intake and exhaust vents outside
Look on the exterior of the RV for the furnace vent. Make sure it isn't blocked by debris, mud, or a pest nest.
02
Check the interior return air opening
The furnace pulls air from inside. Check that the return grill isn't blocked by furniture, bedding, or stored items.
Furnace · Airflow Cleared
Clear the Blockage and Retest
Clear any blockage from vents or return air, then try the furnace again. Blocked airflow is a surprisingly common cause of furnace no-ignition.
✅
Airflow Fixed It
A blocked vent or return was preventing the sail switch from confirming airflow — so the furnace refused to ignite. Clear vents are easy to overlook and worth checking every season.
Furnace · Branch A · Summary
You've Checked the Most Common Causes
You've checked more than most RV owners would — and in the right order. That puts you ahead going into a service call.
✓
You've now checked:
Propane supply · Other propane appliances · Battery voltage · Airflow / vent blockages
→
If still no heat, the likely remaining causes are:
Ignition failure (igniter or electrode) · Flame sensor issue · Sail switch fault · Control board problem · Gas valve not opening
⚙ Tell the technician
Fan runs but no heat. You already confirmed: propane supply is good, other propane appliances work, battery voltage is adequate, and vents are clear. Whether you hear any clicking. This rules out the beginner-level causes and points directly to the ignition or control sequence.
Furnace · Branch B · Step 1 of 3
This Often Points to a Shutdown Condition
If the furnace starts the blower and then gives up, it may not be completing its normal startup sequence. The furnace is trying — but something is stopping it from moving to the next step.
What this tells us: This pattern usually points more toward airflow, voltage, or a safety shutdown than a thermostat problem. We'll check those first.
✅The fact that it starts at all means the control board and fan circuit are working. We're narrowing this down.
Furnace · Branch B · Step 2 of 3
Check Battery / 12V Strength
Low battery voltage is a common reason the furnace starts its sequence but shuts down before completing it. The fan motor will start at lower voltage — but ignition circuits need more.
What this tells us: A furnace that starts then stops is often protecting itself. Low voltage is one of the most common triggers for an early safety shutdown.
Furnace · Low Voltage
Charge Battery and Retest
Charge the battery or connect to shore power, then try the furnace again. If it completes its startup and runs normally, low voltage was the cause.
Furnace · Branch B · Step 3 of 3
Check for Blocked Vents or Weak Airflow
Restricted airflow can stop the furnace from moving to the next step in its startup sequence. The sail switch needs to see adequate airflow before allowing ignition.
01
Check exterior vent openings
Look for debris, insects, or nesting blocking the furnace vent on the outside of the RV.
02
Check interior return air
The return grill should be free of obstruction. Items stored against it reduce airflow significantly.
Furnace · Branch B · Summary
You've Checked the Right Things
You've checked the most common causes for a furnace that starts but shuts off early. You've checked more than most RV owners would.
✓
You've now checked:
Battery / 12V voltage · Exterior vent blockages · Interior return air
→
If still shutting off, the likely remaining causes are:
Sail switch fault · High-limit safety switch tripping · Ignition lockout from repeated failed attempts · Control board issue
⚙ Tell the technician
Fan starts then shuts off before heating. You already confirmed: battery voltage is adequate, vents are clear, and the furnace shuts down consistently. Whether you hear any clicking before shutdown. This points to an internal furnace sequence issue.
Furnace · Branch C · Step 1 of 2
Clicking Means the Furnace Is Trying
Clicking usually means the ignition sequence is actively trying to light. That tells us the furnace is not completely dead — the igniter is firing, but the flame isn't catching.
What this tells us: This separates "no attempt to ignite" from "trying but failing." A furnace that clicks is further along in its sequence than one that simply blows air — which actually narrows the problem.
✅Clicking is actually a useful clue. It means the control board is running the sequence — we just need to figure out why it's not completing.
Furnace · Branch C · Step 2 of 2
Check Propane Supply and Battery Voltage
Both fuel and 12V power matter even when the igniter is clicking. A weak spark, insufficient propane pressure, or a flame sensor issue can all prevent a successful light-off.
01
Confirm propane valve is open and tank has fuel
Low propane pressure — especially in cold weather — can cause ignition attempts to fail.
02
Confirm battery voltage is not low
Low voltage can produce a weak spark that won't reliably ignite the burner.
03
Try cycling the thermostat off and back on
After repeated failed attempts, some furnaces enter a lockout state. Turning the thermostat off for 30 seconds then back on can reset it.
Furnace · Branch C · Summary
Ignition Is Trying — But Not Completing
If you hear repeated clicking but never get heat, the furnace is actively trying to light but something is preventing a successful ignition. You've already ruled out the simple causes.
✓
You've now checked:
Propane supply and pressure · Battery voltage · Thermostat lockout reset
→
If still clicking with no ignition, the likely causes are:
Weak or failed igniter electrode · Flame sensor not detecting a flame · Gas valve not opening fully · Ignition lockout requiring reset
⚙ Tell the technician
Furnace clicks during startup but never ignites. You confirmed: propane is adequate, battery voltage is good, and thermostat was cycled. Number of clicks before shutdown if you noticed. This points directly to the igniter, flame sensor, or gas valve — all testable components.
Furnace · Start with Basics
Let's Start With the Most Common Checks
No problem — we'll start simple. These three checks resolve the majority of furnace no-heat complaints before needing any technical diagnosis.
01
Confirm propane is on
Tank valve open, tank not empty. Try a stove burner to confirm propane delivery.
02
Confirm battery is not low
Are lights bright? Is the 12V system behaving normally? Low battery is a hidden furnace killer.
03
Notice what the fan does
Does it run steadily, start and stop, or do you hear clicking? That detail helps narrow the cause.
Tank Monitor · Start Here
Tank Says Full After Dumping
Take a breath — this is one of the most common RV complaints. In most cases, the tank is not actually full. The monitor is usually the issue, not the tank.
Important to understand: The monitor does not measure liquid level directly. It reads sensors inside the tank. If those sensors are dirty or coated, they give false readings — even when the tank is empty.
✅Most RV owners deal with this at some point. We'll figure out what's happening step by step.
Tank Monitor · Step 1
What Are You Seeing?
Choose what sounds closest. This helps separate a sensor reading issue from a real tank drainage issue — they need different fixes.
Tank Monitor · Branch A · Step 1
This Is Usually a Sensor Issue
If the tank was just dumped, it is very likely not actually full. The monitor reading "full" after a dump almost always means the sensors inside the tank are dirty or coated.
What this tells us: This helps us avoid chasing a problem that isn't really there. The tank is probably fine — we just need to clean the sensors so they can read accurately again.
💡This is the most common tank monitor complaint in RVs. You are not alone in this.
Tank Monitor · Branch A · Step 2
What Causes This?
Toilet paper, waste, and residue can build up on the sensors inside the tank over time. Once coated, the sensors read "full" regardless of actual tank level.
What this tells us: Cleaning the sensors — not replacing the monitor — is the first step. This is a maintenance issue, not a system failure.
01
Residue sticks to sensor probes
The sensors are small probes on the tank wall. Coating them is enough to make the monitor read incorrectly.
02
This gets worse over time
The longer the buildup sits, the harder it is to remove with a simple rinse.
Tank Monitor · Branch A · Step 3
Try a Tank Rinse
Add several gallons of water to the tank, then dump again. If your RV has a built-in tank flush system, use it — let it run for several minutes before dumping.
Why this matters: Water and movement help loosen the buildup coating the sensors. One good rinse often restores accurate readings immediately.
💡 No flush system?
Add water through the toilet, then drive the RV a short distance or let it sit and rock slightly. Movement helps break up buildup against the tank walls and sensor probes.
Tank Monitor · No Flush System
No Problem — Here's What to Do
Add several gallons of water through the toilet. Then drive the RV around the block or let it sit for a few hours. Movement and soak time help break up buildup.
💡 Tank treatment products
Tank treatment products (available at any RV store) are designed to break down buildup and reduce sensor fouling. Adding one regularly helps prevent this from recurring.
Tank Monitor · Branch A · Result
Did the Reading Improve?
✅
Sensors Are Reading Correctly
A rinse cleared the buildup off the sensors. Keeping the tank treated and rinsing regularly will help prevent this from coming back.
💡 Prevent it next time
Use a tank treatment product after each dump and always leave some water in the tank during use. This keeps sensors cleaner and reduces buildup over time.
Tank Monitor · Branch A · Still Reading Full
What This Tells Us
If cleaning didn't fix the reading, the sensors may have heavy buildup or may be permanently fouled. This is very common in older tanks — and it doesn't mean the tank is broken.
Important to know: The tank can still be used normally even if the monitor isn't accurate. Many RV owners with fouled sensors simply track usage instead of relying on the gauge.
Tank Monitor · Practical Tip
How to Manage This
Many experienced RV owners don't fully trust their tank monitors — especially black tank sensors. Instead, they estimate usage based on time and number of people.
01
Track by days and usage
Most RV tanks hold enough for 3–5 days for 2 people. Dump before you think you need to, not after.
02
Repeat treatments over time
Multiple tank treatments and rinses over several dump cycles can sometimes restore sensor accuracy gradually.
03
Sensor replacement is possible
If accurate monitoring matters to you, aftermarket external sensors (mounted outside the tank) are available and much more reliable than internal probes.
✅ You've checked the right things
You've ruled out a real full tank, tried sensor cleaning, and understand what's actually happening. That puts you ahead of most RV owners dealing with this.
Tank Monitor · Branch B · Step 1
This May Be a Real Tank Issue
If the tank isn't draining fully, the monitor may actually be right — or partly right. We need to check whether the valve is opening fully and whether flow is normal.
What this tells us: Poor drainage can leave waste behind, which causes both real and sensor-related readings. We'll check the simplest cause first.
Tank Monitor · Branch B · Step 2
Check the Dump Valve
Make sure the dump valve is fully open when you pull it. A valve that's only partially open will restrict flow and leave waste in the tank.
01
Pull the handle all the way out
It should pull firmly to a fully extended stop. If it feels like it's stopping short, the valve may be partially blocked or stuck.
02
Black tank first, then grey
Always dump black water first, then grey. The grey water flow helps flush the hose.
Tank Monitor · Valve Issue
Valve May Be Sticking or Partial
A dump valve that won't open fully is a common issue — especially if the RV sat for a long time. Dry seals and debris can cause it to stick or not travel its full range.
⚙ What to do
Try pulling firmly and then pushing and pulling the handle a few times to work it loose. If it won't move freely, a technician may need to inspect the gate valve — a stuck valve is a fixable mechanical problem.
Tank Monitor · Branch B · Step 3
How Is the Flow?
When you open the valve to dump, how does the flow seem compared to normal?
What this tells us: Strong flow with a full reading usually points to sensors. Weak flow with a full reading usually points to a real blockage or partial drainage.
Tank Monitor · Strong Flow
Flow Is Fine — Back to Sensors
If the tank drains quickly and completely but the monitor still reads full, the tank is almost certainly empty. This is a sensor issue, not a drainage issue.
✅Good news — your tank is emptying properly. The monitor just needs sensor cleaning.
Tank Monitor · Branch B · Step 4
Possible Blockage or Buildup
Weak flow usually means something is restricting drainage. This can be a partial blockage in the tank, a buildup pyramid near the drain outlet, or a restricted hose connection.
What this tells us: Buildup can physically block the outlet and leave waste behind — causing both real tank fullness and sensor fouling at the same time.
Tank Monitor · Branch B · Step 5
Try Breaking It Up
Add water to the tank and let it sit for several hours or overnight. Then dump again. If you have a flush system, use it before dumping.
01
Fill tank with water
Add enough to cover the bottom of the tank — several gallons minimum.
02
Let it soak
Several hours is better than a few minutes. Overnight is ideal for heavy buildup.
03
Drive if possible
Movement sloshes the water against the walls and helps break up the blockage.
Tank Monitor · Branch B · Result
Did That Improve Flow?
✅
Flow Restored
The soaking and rinse broke up the blockage. Regular tank treatment and rinsing will help prevent this from building up again.
💡 Going forward
Always keep enough water in the black tank during use — a dry tank encourages pyramid buildup near the outlet. Tank treatment products help break down waste and keep sensors and drains cleaner.
Tank Monitor · Branch B · Summary
What This Tells Us
If flow is still poor after soaking and rinsing, there may be a heavier blockage or a physical issue with the valve or drain outlet. This is beyond what a rinse can fix.
✓
You've now checked:
Valve operation · Flow strength · Soaking and rinse attempt
→
Likely remaining causes:
Heavy pyramid buildup blocking the outlet · Stuck or damaged gate valve · Partial obstruction in the drain line
⚙ If calling a technician
Tell them: black tank not draining fully. You already tried: valve check, soak and rinse. Flow is weak or stopped. They'll likely inspect the gate valve and check for a pyramid blockage near the outlet.
✅You've checked the most common causes — that puts you ahead of most RV owners dealing with this.
Tank Monitor · Not Sure
Start With the Most Common Cause
No problem. We'll assume the tank was emptied and check the simplest explanation first — dirty sensors giving a false reading.
💡In most cases where a tank reads full after dumping, sensor buildup is the cause. That's where we'll start.