What is RV Water Heater DSI Fault?

If you see a fault code that indicates a DSI fault, then your water heater is not working most likely because of no incoming gas.

Your DSI may fail because of these reasons:

  • control board issues
  • check valve
  • no airflow
  • no water in tank
  • bad ECO
  • faulty thermostat
  • Boiler Safety Circuit board is bad
  • out of gas

DSI is direct spark ignition which adds flame to the gas in your RV. FLT means fault.It is an improved way to light the pilot and shuts off gas flow if it is not ignited as a safety feature.

DSI control system turns off ignition once the room temperature is what you want.


You can fix it yourself

You can reset the water heater by pressing reset button.
Note you may hear a clicking sound, that is normal.

You will find it in the panel and will need a screw driver. Each RV is different so
get details from your owners manual.

Here is a video showing how to do it:


You may have air in the line and it needs to be flushed out try running all stove burners for a minute to bleed it out.

A replacement control board will cost about $200.