Atwood water heater malfunction
My Atwood 10 gal. WH is acting strange. I usually run it on 110v, but right now it is on propane. Worked fine for a few days and then I shut it off for about 36 hrs. When I turned it back on, it fired up on gas just fine, ran for about 3-4 min. and shut off (too soon to reach temp), then re-fired in about 4 sec. This repeated maybe 6 times before I just shut it down.
I've looked at the manual. Problem can't be with the 'thermal cutoff' because that is a one-time only safety fuse. Problem could be with the main thermostat, I've checked that it is in direct contact with the tank, so it could be stuck closed. But according to the manual, the 'ECO' should open and lockout the system, requiring power reset. But the system keeps cycling on and off. Probability of both sensors failing at the same time seems very low. So, maybe it is the circuit board? Or maybe just the main thermostat not staying open once the water is up to temp?
Based on the manual, symptoms should be the same on 110v, but just harder to detect without a meter hooked up to it. In 25 yrs, this is the first WH problem I've had. Anyone have any thoughts or suggestions?
I've looked at the manual. Problem can't be with the 'thermal cutoff' because that is a one-time only safety fuse. Problem could be with the main thermostat, I've checked that it is in direct contact with the tank, so it could be stuck closed. But according to the manual, the 'ECO' should open and lockout the system, requiring power reset. But the system keeps cycling on and off. Probability of both sensors failing at the same time seems very low. So, maybe it is the circuit board? Or maybe just the main thermostat not staying open once the water is up to temp?
Based on the manual, symptoms should be the same on 110v, but just harder to detect without a meter hooked up to it. In 25 yrs, this is the first WH problem I've had. Anyone have any thoughts or suggestions?
