Originally Posted by penne
Thank you. We did try that as we noticed a few spiders on the houseboat but had no luck
Sounds though the unit is getting power to the gas valve, therefore the thermostat, the high temp limit is allowing it to go. However the ignitor and thermocouple are not powered and therefore the gas valve trips on a timer. In short there is an electronic board on the front of the heater that controls these steps. I'd locate the nameplate data inc serial number and give Suburban tech service a call for your next step, they are quite friendly. You didn't mention age but if less than 2 years its a warranty problem.