Staff Answer
Sep 27, 2026 - 06:34 PM
If it trips the breaker a few seconds after switching to electric, the AC heater is most likely shorted to ground. Unplug the heater from the board and check it with your meter. It should read resistance between the two leads and nothing (open) from either lead to the metal housing. The heater you need depends on your cooling unit's serial number: below 11231023 it's the 621702 AC heater, and above it's the 638374 AC heater.
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