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Old 06-05-2020, 04:53 PM   #11
16ACE27
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,116
THOR #7035
Quote:
Originally Posted by javelin View Post
Well, I guess in my original post I assumed Atwood would use a relay for the heater element control, but then the on line manual AC troubleshoot section must be a simplified schematic just showing a “switch”. Then I just looked in the manual again in the schematic section at the end....sure enough a relay is used for 120vac control to the element. (Picture is attached). My bad.



Checking the schematic it seems the only wire to the circuit board related to the electric heating element, is the yellow wire from the relay coil, as mentioned. Possibly the relay coil ground connection should also be checked if it just bolts to the water heater chassis. So if the yellow wire connection at the circuit board is flaky it would stop the relay from operating and connecting 120vac to the water heater element.


You are out of warranty (extended?), so if the circuit board connector cannot be fixed, you could attempt to solder a new similar gauge wire to the circuit board (copper trace side in the correct location of course) and hard wire splice connect it to the yellow wire leading to the relay coil. (Essentially jumpering the yellow connector junction). Removing the circuit board might be a bear though. If you do this though disconnecting the connector would be a hassle in future if required.

Or just go buy a Dinosaur replacement board. Too many people with problems from Atwood controller boards.
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