Staff Answer
Sep 28, 2026 - 07:33 AM
With 120V at the heater and weak cooling on AC only, the AC heater is most likely failing or not fully seated in its pocket. Check its resistance and make sure it's pushed all the way in. The replacement depends on your cooling unit's serial: below 11231023 is the 621702 AC heater, and above is the 638374 AC heater.
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