I really hope we can find some help with this. I'm pulling my hair out!
We have an Atwood G6A-8E water heater, which is a 6 gallon electronic ignition gas unit in an '89 Fleetwood.
The problem: the heater will not stay lit. The ignitor sparks, the gas lights off and burns for a few seconds and then shuts down. This will repeat 2 more times and then it locks out.
What we've done:
1) replaced the igniter/electrodes (first thought being that the "flame on" message was not being sent back to the control board.) The heater worked fine for the next 6 hours, then quit and went back to the original problem.
2) next, we checked the voltages, they were all at 12v or so. After poking around with the meter, heater again lit and ran for a few hours, then back to original problem.
3) replaced the ECO/thermostat (not for any particular reason, but we had a new spare). Again, the heater lit and ran for a few hours before reverting
4)Had the rig at an RV repair place for another issue, so we had them look at the W/H. They swapped out the control board for a new one, but the new board did not fix it so they put the old one back in. They replaced the thermal cutoff and the heater again lit and ran for a few hours.
5) Replaced the wiring harness, with exactly the same results as every other time. Lights, runs, quits after a few hours.
6) Also filled the propane tank, since it was pretty low, removed and cleaned the burner tubes, checked the flame spreader, made sure the air adjustment was correct. The flame seems to be the right color and shape.
Now, the only 2 components left unreplaced are the control board, which should be OK according to the RV repair guy, and the gas valve.
The ground connection is clean and tight. The light and switch inside on the panel work as they are supposed to.
Does anyone have any idea what is going on here????
We've downloaded the Atwood service manual, but the troubleshooting guide doesn't cover anything new.
Besides being a major pain not having hot water, this is getting expensive and infuriating.
I'd sure appreciate some feedback!