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.

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."

Turn the battery disconnect OFF every time you store the RV. Then recharge the battery fully and test again after a week.

Even with the disconnect ON, some items draw power constantly. Has the battery been sitting connected for more than a few days?

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.

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.

You've worked through this the same way a technician would — starting with the simplest causes and moving toward deeper ones.

This is the first thing a technician would ask. Whether you're plugged in or not completely changes where the problem is coming from.

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.

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.

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.

Loose or corroded battery terminals can prevent the battery from charging properly — even when everything else is fine.

Corrosion can be cleaned with a wire brush or a baking soda and water mix. Tighten any loose clamps after cleaning. Then retest.

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.

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.

Choose the option that sounds closest. This helps separate airflow problems from ignition problems — they point to different causes.

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.

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.

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.

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.

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.

Set your multimeter to DC Volts. Touch the red probe to the + battery terminal and black to the −. Read the display.

Charge or shore-power the battery first, then try the furnace again. A lot of furnace "failures" resolve completely once voltage is restored.

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.

Clear any blockage from vents or return air, then try the furnace again. Blocked airflow is a surprisingly common cause of furnace no-ignition.

You've checked more than most RV owners would — and in the right order. That puts you ahead going into a service call.

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.

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.

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.

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.

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.

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.

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.

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.

No problem — we'll start simple. These three checks resolve the majority of furnace no-heat complaints before needing any technical diagnosis.

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.

Choose what sounds closest. This helps separate a sensor reading issue from a real tank drainage issue — they need different fixes.

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.

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.

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.

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.

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.

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.

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.

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.

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.

When you open the valve to dump, how does the flow seem compared to normal?

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.

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.

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.

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.

No problem. We'll assume the tank was emptied and check the simplest explanation first — dirty sensors giving a false reading.

Use this guide when your leveling system or landing legs won't retract, won't level, or stop with an error. Start by choosing the system you're dealing with — this separates two very different diagnostic paths.

Pick the option that best describes what happens when you try to operate the leveling system.

When a leveling system gives no response at all, the problem is almost always a power issue — not the jacks or control board. Check these in order.

If voltage is reaching the system but nothing responds, the most likely next step is a wiring connection issue or a controller that has stopped communicating.

Before checking anything else, do a known starting point reset. This is the single most important step when jacks move but won't complete a cycle — and it solves the problem more often than anything else.

Before looking at mechanical causes, consider the setup. Some incomplete retraction problems have nothing to do with the jacks themselves.

When one jack behaves differently from the rest, the problem is localized. This is when a mechanical issue — including possible physical damage — becomes worth looking at directly.

You've done the reset, ruled out site and setup issues, and confirmed all jacks are behaving similarly. At this point the most likely causes are a sensor or control board issue, or a system at or near stroke limit.

When a leveling system starts, moves, and then stops on its own — with or without an error code — the cause is often the system's reference point, not a physical failure.

This is the most important step for a system that stops mid-cycle or throws errors. It re-establishes the position reference the controller relies on.

Check the control panel for any displayed error code or fault message. If you see one, it narrows the direction significantly.

Choose the error that best matches what the panel is showing. Error code language varies by brand, but these are the most common categories.

An out-of-stroke error means the system believes one or more jacks have reached their maximum travel limit.

The leveling system is reporting that battery voltage is too low to operate safely. This can happen even while plugged into shore power.

The auto-level system ran its sequence but couldn't bring the coach to level within its operating range.

A system that stops mid-cycle without displaying an error has usually hit an internal condition it can't resolve — but isn't flagging it as a named fault.

Auto level failure is almost always one of three things: the site is beyond the system's range, the system has lost its position reference, or the sensor reading tilt is giving wrong data.

Choose the option that best describes what happens when you operate the landing legs.

Landing legs that give no response at all are almost always a power issue. Work through these checks before assuming anything mechanical.

When one leg moves and one doesn't, it's tempting to assume the non-moving leg is bent or broken. In most cases, the problem is in the drive system — not the leg itself.

A stripped cross-shaft connection, failed gearbox, or disconnected drive linkage is the most common cause of one-leg-only behavior. This is a mechanical repair that needs hands-on access to the drive system.

When both legs move but are slow, labored, or stalling, the cause is almost always power or load — not mechanical failure.

If you can hear the motor running but the legs aren't moving, the drive connection between the motor and the legs has failed. The motor is spinning — but nothing is turning the legs.

Uneven travel or binding during operation is the point where physical damage to the leg becomes more likely — but check setup and alignment before assuming damage.

Start by confirming the type of awning. Manual and power awnings fail in completely different ways — this separates the diagnostic path immediately.

Pick the option that best matches what happens when you try to operate it.

These narrow the likely cause before we start checking components.

Based on what you described, here are the three most likely places to start — in the order a technician would check them.

Manual awnings have fewer parts to fail, but the failure modes are specific. Here's where to look first.

Slide systems fail in very different ways depending on how they're built. Identifying the type first points us at the right causes immediately.

These three factors cause more slide problems than anything mechanical — ruling them out first saves a lot of chasing.

Pick the option that best describes the symptom.

Before chasing type-specific causes, these checks apply across all slide systems and resolve a significant portion of problems without mechanical diagnosis.

Absorption fridges and 12V compressor fridges fail in completely different ways. Identifying the type first puts us on the right path immediately.

Before checking the fridge itself, these are the most common causes of absorption cooling problems that have nothing to do with a failed component.

Norcold and Dometic absorption fridges share the same basic technology but have different failure patterns and different diagnostic approaches.

Before assuming a failed cooling unit, these checks resolve the majority of absorption cooling complaints.

Compressor fridges are mechanically simpler than absorption units but have their own specific failure points. Start with power and airflow before looking at the compressor itself.

Rooftop units and mini-splits fail differently. Identifying the system type first puts us on the right diagnostic path immediately.

The majority of rooftop AC problems that look like unit failures are actually power quality problems or owner-side issues. Ruling these out first prevents misdiagnosis.

Pick the option that best describes what happens when you try to run the AC.

A completely unresponsive AC unit — no fan, no display, no click — is almost always a power or control communication issue rather than a failed AC component.

A breaker that trips the moment the compressor tries to start is telling you the startup current draw exceeded what the circuit can supply. That's either a power supply problem or a failed capacitor making the compressor work too hard to start.

An AC that runs continuously but can't reach the set temperature is almost always an airflow or heat-rejection problem — not a refrigerant or compressor issue. Start outside before looking at the unit itself.

Ice on the evaporator is almost never a sign that the AC has failed. It's almost always caused by restricted airflow or operating conditions the unit wasn't designed to handle continuously.

Mini-splits in RVs are a newer and growing category. The diagnostic approach follows standard HVAC principles, with some RV-specific considerations around power supply and installation.

Before identifying the system type, check these two things. They are the most common causes of no-hot-water complaints across every water heater type — and both are owner-side issues that have nothing to do with the heater itself.

Each system type has its own failure patterns. Choose the one that matches your setup.

Choose what best describes what the water heater is doing.

A rotten egg smell from hot water taps almost always points to the anode rod. It is rarely a plumbing or water supply problem.

Tankless water heaters only fire when water flows through them above a minimum threshold. Understanding this is essential before diagnosing a no-hot-water complaint.

The Truma Combi is a combined space heater and water heater. It is a sophisticated, error-code-driven system — the diagnostic path almost always starts with reading the fault code from the control panel or TrumaApp.

The Aqua-Hot is a diesel-fired hydronic system that simultaneously heats the living space and provides domestic hot water through a single fluid circulation loop. It is a complex, high-value system — most deeper diagnosis requires a technician familiar with hydronic heating.