How to Reset DSI Fault on an RV Water Heater

Few things ruin a road trip faster than stepping into your RV for a warm shower and finding only cold water waiting. That little red DSI fault light on your control panel is more than a warning—it’s your water heater’s way of saying something has gone wrong.

For many RV owners, the DSI fault is one of the most common yet confusing issues to deal with. It means your water heater’s ignition system failed to light or keep the flame burning. Nearly 40% of RV water heater problems come from ignition or flame-sensing issues.

The main challenge is figuring out why it happened and how to reset it safely. Sometimes the propane tank is empty, sometimes there’s air in the line, and other times the control board just needs a reset. Most cases are simple and can be fixed in minutes without calling a technician.

Knowing how to reset DSI fault on an RV water heater saves time, money, and frustration. It also ensures you’ll always have hot water ready when you need it most. By understanding what triggers the fault and how to prevent it, you’ll keep your system working smoothly and avoid cold showers on the road.

What Is a DSI Fault on an RV Water Heater?

A DSI fault happens when your RV water heater’s Direct Spark Ignition system fails to ignite or maintain a steady flame. The control board automatically shuts off the burner to prevent unsafe gas buildup.

Modern RV water heaters, such as those made by Suburban or Atwood, use electronic ignition instead of a manual pilot flame. When the system tries to ignite, it sends a spark to light the propane burner. If no flame is detected after several seconds, the system locks out and activates the DSI fault light.

This lockout is a built-in safety feature. It prevents raw propane from flowing unburned into the combustion chamber.

What does “DSI fault” actually mean?
It means the ignition system failed to light or keep the flame on during startup.

Does the DSI fault light mean something serious?
Not always. It often results from temporary issues like air in the propane line or low gas pressure.

Which RV heaters use DSI systems?
Most modern models from Suburban, Atwood, and Dometic rely on direct spark ignition technology.

How does the heater detect flame?
A small sensor or thermocouple sends a signal to the control board when the flame is present.

Can the DSI fault clear itself?
No. Once the system locks out, it must be manually reset.

Common Causes of a DSI Fault on an RV Water Heater

Understanding what causes a DSI fault helps you prevent it from happening again. The most common reasons include propane supply issues, dirty components, or electrical faults.

In many cases, the heater fails to ignite because the propane tank is empty or air has entered the line. Dirt, insects, or corrosion can also block the burner and prevent proper ignition.

Can running out of propane trigger a DSI fault?
Yes. When propane runs out, air enters the line and stops the burner from lighting.

Does a blocked burner cause the fault?
Yes. Dirt, rust, or spider webs in the burner or vent can interrupt ignition.

Can bad wiring or sensors be responsible?
Absolutely. Damaged wires or corroded connectors can stop power from reaching the igniter.

Can moisture cause a DSI fault?
Yes. Condensation around the control board or igniter can cause temporary malfunctions.

Does switching propane tanks too fast affect it?
Yes. If air enters the line during tank changes, ignition will fail and trigger the fault.

Step-by-Step: How to Reset DSI Fault on an RV Water Heater

Resetting the DSI fault is a simple process, but you should follow the steps carefully to avoid damage.

1. Turn off the RV water heater at the control panel.
   
2. Wait about one minute to allow the control board to reset.
   
3. Make sure the propane tank is full and the valve is open.
   
4. Inspect the burner compartment for dirt, debris, or insects.
   
5. Turn the water heater back on and watch if the burner ignites properly.
   

If the DSI fault light stays off, the reset was successful.

What should you do first when resetting?
Always shut off power and gas to safely clear the system’s lockout.

How do you verify propane flow?
Briefly light a stove burner to confirm propane is reaching the appliances.

What if the fault light comes back?
Check the flame sensor, wiring, and burner assembly for damage or dirt.

Is there a reset button on the heater?
Most RV heaters don’t have one; the reset happens by turning the switch off and back on.

Can you reset it multiple times?
You shouldn’t. If the fault reappears more than twice, there’s likely a deeper issue that needs attention.

Preventing Future DSI Faults on Your RV Water Heater

Prevention is the best fix for a DSI fault. Simple maintenance steps can keep your water heater reliable for years.

Regular cleaning, checking propane lines, and protecting components from moisture go a long way in avoiding ignition issues.

How often should you clean the burner?
Clean it every 6 to 12 months, or more often if you camp in dusty or humid areas.

How can you prevent air from entering propane lines?
Turn off the heater before switching tanks and open valves slowly.

Do insects cause DSI faults?
Yes. Spiders and wasps love nesting inside burner tubes, blocking airflow.

Should you check wiring regularly?
Definitely. Loose or corroded wires interrupt signals between the igniter and control board.

Can weather conditions affect ignition?
Cold temperatures can reduce propane pressure, making it harder for the system to ignite.

When to Call a Professional for DSI Fault Issues

While most DSI faults can be fixed with a simple reset, some require expert help. Persistent faults or signs of electrical damage should be checked by a certified technician.

Ignoring repeated faults can lead to gas leaks or carbon monoxide risks. A professional can test the control board, sensors, and ignition circuit to find the root cause.

When is it time to call a technician?
If your water heater fails to ignite after two resets or shows no spark or clicking sound.

How much does professional repair cost?
Minor repairs like cleaning sensors are inexpensive, but control board replacement can cost a few hundred dollars.

Can a technician test the board and sensors?
Yes. They can measure voltage, ignition signals, and flame detection accuracy.

What certifications should you look for?
Always choose an RVIA-certified or trained technician for gas system repairs.

Is it safe to use the heater with the fault light on?
No. Always turn it off until the issue is fixed to avoid dangerous gas buildup.

Conclusion

Resetting a DSI fault on an RV water heater is easier than most people think. It usually comes down to fixing gas flow or cleaning ignition parts.

By understanding how the DSI system works and performing regular maintenance, you can prevent future lockouts and enjoy worry-free hot water. If the fault keeps returning, don’t ignore it—get a technician’s help before it becomes a costly repair.

Learning how to reset DSI fault on an RV water heater means you’ll never be caught off guard again. Keep your system clean, your propane full, and your next shower perfectly warm.