Most modern RV water heaters are the DSI (Direct Spark Ignition) type, which has no pilot light. When you switch on the water heater in LP Gas mode, the gas mode thermostat will call for it to be heated as needed. When heating is called for, the heater control circuit board opens the gas valve and activates the igniter, making a spark at the front of the heater’s gas burner tube, and [hopefully] igniting the flame. At the same time, the control board starts sensing for a flame [the igniter doubles as a flame sensor]. When the burner flame is sensed, the ignition sequence is complete. If no flame is detected after a preset time (about 15 seconds), the gas valve is closed, the igniter is turned off, and the system “locks out,” meaning it won’t allow another attempt at restarting until the system is reset by turning it off and on again. Usually a red indicator light will show at the LP Gas Mode switch if the heater fails to light when needed.
Problem - No sparks on electrodes
For more tips about RV maintenance and service, contact Mike at firstname.lastname@example.org
or call (800) 551-9149 ext. 2030
Posted on 8/18/2014 at 3:00:00 AM