Someone care to give me some info on the OP's question? I didn't see anything in particular being referenced so I'm not sure what problem they are referring to.
I had my hot water heater quit working one day for no good reason that I could figure.
Of course, the beginning of a weekend, at night, 300km's from my dealer. I was just as happy to do the work myself, but getting the parts proved difficult.
Started out by finding that my electric was not working.
Light at the panel was on, so the supply from the panel was good as far as that was concerned.
Next I tried the gas, but nothing happened. No lighting, no gas valve.
Tested the logic board on the front of the heater, and it was dead.
Power appeared to be getting to the board from the wire harness.
Replaced the board, and I got gas working, but still no electric, so it was time to remove the access panel form the inside of the TT.
Checked the wiring for the element, and had 1 burnt wire that had melted at the relay that supplies the 110v in to the element. No idea why that had happened, didn't appear to be any signs of arcing. Maybe the relay shorted internally or something.
Anyhoo, after turning off the breaker, using an extendable mirror, a mental picture and some patience, I replaced the wire and the relay, and it's been fine since.
Got all of the parts through warranty. Atwood was quite helpful in the diagnosis. I just got them on the phone and had them reaffirm my findings before replacing the logic board, and then when replacing the wire/relay.