Water heater problem

Had it happen twice and both times a paper wasp took up residency in the burner orifice.

Spark Electrode is typically used for High Voltage Spark to ignite the gas AND for Flame Proving Signal return path

You replaced the spark electrode.......is it fully engulfed in flame when the flame does light....must be in order for Flame proving signal to be sensed by circuit board.


Course a 2000 year RV could have thermocouple which is used to keep gas valve open

BUT W/O brand/model ALL responses are GUESSES

Bad thermocouple
Partially clogged burner orifice
Defective control bard
Bad wire between control board and ignightor/sensor, .

Thanks for responding guys, I will look for blockages and I should have told you it worked fine the first couple trips out this year then it started acting up.
This is the part I changed already

Check for an obstruction in the burner tube, like a spider nest. Also, check the fire chamber for a wasp nest. Very common

Sounds like the thermocouple is bad to me.