Plumbing Questions? Ask a Plumber and Get Answers ASAP.
turn the heater off at the switch for 2 min and turn it back on
if it dont go back on check the spill switch at the flue ( silver pipe ) it should have a red dot
depending on the model and year thay had a bad run of switches and it may need to be replaced
sorry the power switch to the unit ( the main switch )
i understand the power is fine what i need you to do is shut the power off ( un plug ) the unit wait 2 min and re plug it if the unit dont go on and stay on you have a bad sensor that needs to be replaced