If you own an RV, the water heater is one appliance you rely on every day. Hot water lets you enjoy showers, clean dishes, and feel at home wherever you park. For many RVs, the Suburban water heater is the heart of this comfort. But what happens when you turn on the tap and get only cold water? Or when you smell gas but don’t hear the familiar whoosh of ignition? Troubleshooting these issues can be stressful, especially for new RV owners. The good news is, most common Suburban RV water heater problems are simple to diagnose—and often, even beginners can fix them without calling a technician.
This guide will walk you through everything you need to know to troubleshoot your Suburban RV water heater. You’ll learn how the system works, how to spot problems, and which steps to take for safe and effective repairs. With clear explanations and practical tips, you can save time, money, and keep your adventures comfortable.
How Suburban Rv Water Heaters Work
Understanding how your water heater works is the first step to fixing it. Suburban RV water heaters usually come in two main types: gas-only and gas/electric combo models. Both use a tank (usually 6 or 10 gallons) to heat water, but the heating method can differ.
- Gas models use propane and a spark igniter to heat water. A thermostat monitors the temperature and tells the system when to ignite.
- Combo models have both a propane burner and an electric heating element. You can use electricity when connected to shore power, or switch to gas when off-grid.
Water heaters have basic safety features like pressure relief valves and ECO (energy cut-off) sensors. They are designed to prevent overheating or dangerous pressure build-up.
Key Components
- Igniter: Creates a spark to ignite propane.
- Thermostat: Monitors water temperature.
- ECO Switch: Shuts off the heater if it gets too hot.
- Heating Element: Heats water using electricity (combo models).
- Control Board: Manages ignition and safety functions.
- Pressure Relief Valve: Releases water if pressure is too high.
Knowing these parts helps you identify where things can go wrong.
Safety First: Precautions Before Troubleshooting
Before you begin, always put safety first. Working with gas and electricity is risky if you don’t follow basic steps.
- Turn off all power: Disconnect the RV from shore power and switch off the breaker for the water heater.
- Shut off the propane: Close the main propane valve before any work.
- Let the system cool: Hot water or steam can cause burns.
- Ventilate: If you smell propane, open windows and doors before investigating.
Never ignore these steps. Many RV accidents happen because owners skip basic precautions. If you’re unsure or uncomfortable, always call a qualified RV technician.
Common Problems With Suburban Rv Water Heaters
Problems can range from simple to complex. Let’s look at the most frequent issues and what they usually mean.
1. No Hot Water
This is the most common complaint. It can happen for several reasons:
- Pilot won’t light (older manual models)
- No ignition (DSI/automatic models)
- Burner won’t stay lit
- Electric element not heating (combo models)
- Thermostat or ECO fault
2. Water Heater Leaks
Leaks can come from:
- Loose drain plug
- Damaged pressure relief valve
- Cracked tank
3. Burner Won’t Ignite Or Stay Lit
This often means:
- No propane supply
- Air in the line
- Faulty igniter
- Dirty burner tube
- Bad control board
4. Smelly Or Discolored Water
Possible causes:
- Anode rod corrosion
- Bacterial growth
- Old water in the tank
5. Water Too Hot Or Not Hot Enough
Usually a problem with:
- Thermostat setting
- Thermostat failure
- ECO switch failure
Quick Troubleshooting Steps
If you’re facing a problem, start with these basic checks. Many times, the fix is faster than you expect.
Step 1: Check Power And Propane
- Make sure your RV battery is charged (for DSI models).
- Verify the circuit breaker is ON.
- Check that the propane tank is full and valve is open.
- Try lighting the stove to confirm propane is flowing.
Step 2: Inspect The Switches
- Most Suburban heaters have an on/off switch inside, and sometimes a second switch outside.
- Both must be ON for the heater to work.
Step 3: Listen And Look
- Turn on the heater and listen for the click-click of the igniter, then the whoosh of ignition.
- If you hear nothing, power is likely the issue.
- If you hear clicks but no ignition, it’s often a gas or spark problem.
Step 4: Check The Reset Buttons
- Many models have small reset buttons on the outside panel, near the thermostat.
- Press to reset the system.
Step 5: Examine For Leaks
- Check around the drain plug and pressure relief valve for drips.
- Look for rust or water stains.
If these steps don’t solve your problem, it’s time for a deeper diagnosis.
Diagnosing No Hot Water Issues
When you get only cold water, you’ll need to figure out why. The cause depends on your heater type.
Gas Models
- No spark? Check for 12V power at the igniter. If none, test the fuse or wiring.
- No gas? Make sure the valve is open, and lines are bled (run a stove burner).
- Clicks but no flame? Remove the burner tube, clean out soot or spider webs.
- Burner lights but goes out? Could be a bad thermocouple or dirty flame sensor.
Electric Models
- No heat? Check for 120V at the heating element. If none, test the switch and circuit breaker.
- Element gets power but no heat? The heating element may be burned out. Replace it.
- Tank fills but water never heats? The thermostat or ECO switch may be faulty.
Combination (gas/electric) Models
If both systems fail:
- Test each system separately.
- If both are dead, the problem is likely with the control board or a power supply issue.
Example
A common beginner mistake: forgetting to turn on both the inside and outside switches. Many RVs have an outside switch hidden behind the heater panel. If this switch is OFF, your heater won’t work, no matter what you do inside.
Fixing Leaks In Suburban Rv Water Heaters
Leaks can ruin your RV trip and damage the interior. Most leaks are simple to find and fix if you know where to look.
Drain Plug Leaks
- Turn off power and water.
- Remove and check the drain plug (usually a nylon or metal plug).
- Wrap threads with Teflon tape and reinstall snugly (do not over-tighten).
- Replace the plug if it is cracked or worn.
Pressure Relief Valve Leaks
- Check if water drips from the valve when the heater is running.
- Some dripping is normal as pressure changes. Constant leaks mean the valve may be bad.
- Replace with the correct RV-rated valve.
Tank Leaks
- Look for rust, corrosion, or water under the heater.
- If the tank itself leaks, replacement is usually the only option.
Common Mistake
Over-tightening fittings can crack the tank or valve threads. Always use the correct torque.
Burner And Ignition Troubleshooting
If you hear clicking but no flame, or the burner won’t stay lit, check these areas.
Igniter And Flame Sensor
- Remove the outside heater panel.
- Inspect the igniter electrode: The tip should be clean and about 1/8 inch from the burner.
- Clean with a fine file if sooty or corroded.
- Check the ceramic insulator for cracks—replace if damaged.
Burner Tube
- Remove the burner tube.
- Blow out any debris (spiders love these tubes).
- Clean soot or rust from the tube and orifice.
Control Board
- If everything else checks out, the control board may be faulty.
- Test with a multimeter for 12V power in and out.
- Control boards can fail without warning—carry a spare if you travel often.
Pro Tip
Many RVers carry a spare igniter and control board. These are the most common failure points, and a quick swap can save your trip.
Electric Element And Thermostat Problems
When using shore power, the electric element is your main heater. Problems here are usually electrical.
Heating Element
- Turn off all power.
- Remove the element access cover.
- Test the element with a multimeter (should read 10-20 ohms resistance).
- If open (infinite resistance), replace the element.
Thermostat And Eco
- Test the thermostat for continuity when cold—it should close the circuit.
- The ECO switch should open if the water gets too hot.
- Replace both if faulty.
Example
Many Suburban heaters use a dual-thermostat setup. Replacing both at once saves time and avoids repeat failures.
Water Quality Issues: Smelly Or Discolored Water
If your hot water smells like rotten eggs or is rusty, it’s time to check the tank.
Anode Rod
- Suburban tanks use a magnesium anode rod to prevent corrosion.
- Over time, the rod dissolves and needs replacing (usually once a year).
- A worn rod can cause sulfur smells and tank rust.
Flushing The Tank
- Drain the heater and flush with fresh water using a wand.
- This removes sediment that can cause odors and reduce heating efficiency.
Sanitizing
- Fill the tank with a mix of water and a little household bleach.
- Let sit for a few hours, then flush thoroughly.
- This kills bacteria that create bad smells.
Non-obvious Insight
If you store your RV with water in the tank, always drain and flush before your next trip. Stagnant water is a common cause of smells and corrosion.
Water Temperature Problems
Water that’s too hot or not hot enough is not just uncomfortable—it can be dangerous.
Thermostat Setting
- Most Suburban RV water heaters are set at the factory to about 130°F (54°C).
- If the water is hotter, the thermostat may be stuck or the ECO switch is failing.
Fluctuating Temperatures
- Check for loose wiring at the thermostat or heating element.
- Inconsistent propane pressure can also cause temperature swings.
Scalding Risk
- Always test water temperature before using, especially if children are present.
- Install a mixing valve if the water is consistently too hot.
Pro Tip
Always carry a digital thermometer. It helps diagnose thermostat issues and keeps your family safe.
Comparison: Suburban Water Heater Vs. Atwood
Many RVers wonder how Suburban heaters compare with other brands. Here is a simple comparison:
| Feature | Suburban | Atwood |
|---|---|---|
| Tank Material | Steel (with anode rod) | Aluminum (no anode rod) |
| Anode Rod Needed | Yes | No |
| Longevity | 10-15 years (with maintenance) | 8-12 years |
| Common Issues | Sediment, anode rod wear | Element corrosion |
Suburban heaters require more regular maintenance (anode rod replacement), but can last longer if cared for.
Essential Tools And Parts For Suburban Water Heater Repair
Carrying the right tools and spare parts saves frustration on the road.
Must-have Tools
- Screwdriver set (Phillips and flat-head)
- Adjustable wrench
- Multimeter (for testing voltage and resistance)
- Teflon tape
- Small wire brush or file
Useful Spare Parts
- Anode rod (Suburban-specific)
- Igniter electrode
- Control board
- Thermostat/ECO set
- Heating element
Data Table: Common Spare Parts And Average Costs
| Part | Average Cost (USD) | Replacement Frequency |
|---|---|---|
| Anode Rod | $10 – $20 | Yearly |
| Igniter | $15 – $40 | 3-5 years |
| Control Board | $60 – $120 | Rarely |
| Thermostat/ECO | $20 – $40 | 5-10 years |
| Heating Element | $30 – $50 | 5-10 years |
Preventative Maintenance For Suburban Rv Water Heaters
Regular maintenance keeps your heater running well for years.
Seasonal Care
- Drain and flush the tank at the end of each camping season.
- Inspect and replace the anode rod if more than 75% worn.
- Lubricate the pressure relief valve.
Before Each Trip
- Test the system on both gas and electric.
- Check all switches and wiring for damage.
- Inspect for leaks around fittings and the drain plug.
Yearly Deep Clean
- Remove the anode rod and flush out sediment.
- Test heating element and thermostat.
- Inspect burner tube and clean if needed.
Non-obvious Insight
Many failures happen after long periods of non-use. Always perform a quick test run before heading out, even if your water heater worked fine last season.
When To Call A Professional
Some problems are best left to certified RV technicians.
- Tank leaks: Replacement requires special tools and knowledge.
- Persistent propane smell: Can indicate a dangerous gas leak.
- Repeated electrical failures: May point to wiring issues beyond the heater.
Don’t risk your safety—if in doubt, get expert help.
Troubleshooting At A Glance
Here’s a quick reference table for common problems and likely causes:
| Problem | Likely Cause | Quick Fix |
|---|---|---|
| No hot water (gas) | No propane, bad igniter | Check gas, clean igniter |
| No hot water (electric) | Burned out element | Replace element |
| Water leak | Loose plug, bad valve | Tighten/replace |
| Smelly water | Old anode rod, bacteria | Replace rod, sanitize tank |
| Water too hot | Bad thermostat | Replace thermostat |
Frequently Asked Questions
Why Does My Suburban Rv Water Heater Keep Tripping The Reset Button?
This often means the thermostat or ECO switch is faulty, or the water temperature is too high. Check for loose wiring and replace the thermostat/ECO if needed.
How Often Should I Replace The Anode Rod In My Suburban Water Heater?
Replace the anode rod once a year or when it’s more than 75% worn. This protects the tank from rust.
Is It Safe To Run The Water Heater On Both Gas And Electric At The Same Time?
Yes, most combo models are designed to run both systems together for faster heating. Check your owner’s manual for your specific model.
Why Does My Hot Water Smell Like Rotten Eggs?
This is usually caused by a worn anode rod and bacteria in the tank. Replace the rod and sanitize the tank to remove the smell.
Where Can I Find The Official Suburban Rv Water Heater Manual?
You can find official manuals and support at the Suburban/Airxcel website.
Taking care of your Suburban RV water heater means you’ll always have hot water on your adventures. With regular checks, simple tools, and this troubleshooting guide, you can solve most problems yourself. Remember, small issues caught early rarely turn into big repairs—so stay alert, stay safe, and enjoy worry-free travels.
