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Desert_Captain's avatar
Desert_Captain
Explorer III
Apr 01, 2021

Something is weird with my water heater...

A couple of trips ago the AC side of the water heat just quit. No warnings like the water not getting as hot as it had, it just stopped working altogether. No worries I thought as the LP side functions well so I put fixing it on the back burner {I know, bad pun}.

It is the standard garden variety Suburban and at 9 years old I really can't complain. Found a great mobile RV mechanic {who is ASE certified as well} and we started finding odd things going on. Turn off the breaker and the unit is AC hot... say what? with a mild but unpleasant aroma of hot electrical. When he put a wrench on the heating element it began to work. He pulled it and and found lots of corrosion. Put in a new element and still had the bad smell and AC with a the breaker off. The anode rod was fine.

All of this made me more than a little nervous and we still don't know what is going on but I am not going to mess around here and had him order a new unit which should be here in a few days. Replacement seems like the way to go especially since we cannot account for the bizarre symptoms.

I'll follow up when we replace the unit and let you know what we find. Has anyone else had a similar experience? For the record I had the limit switches {AC and LP} replaced about 6 years ago and both sides have worked flawlessly since then {until now?} with no other issues.

:h

4 Replies

  • I agree. Corroded connections is a common culprit.

    Remember that a HWT operates off both 12V and 110V, maybe at the same time. I am not certain, but if you have no 12V, the unit might not work when 110V is available.

    It is that way with the fridge which still requires 12V to operate on 110V.
  • Agree with checking breakers as above. Likely one or more breakers mislabeled.

    As for smell of hot wiring, there have been numerous reports of burned wires in the junction box on the back of the water heater due to poor wire connections. In that case, no need to replace the WH. Just clean up that wiring and make new good connections.
  • Are you SURE the AC CB you opened was in fact the one for the Water Heater AC Element ????

    Open ALL individual CBs in Main AC Panel
    Check that the AC is dead on the element (black/hot---white/neutral)

    Then turn on each CB one at a time....which one provides AC to element??

    ***that should not require a NEW water heater.....it is a wiring problem from AC Panel to the ON/Off Switch in outside compartment

    AN ASE Certified Tech should be able to isolate/identify the source of the AC Power!