Staff Answer
Sep 28, 2026 - 07:28 AM
A 0.002 reading on the limit switch means it's closed, which is good. Next, unplug the AC heater and measure its resistance. It should read roughly 40–70 ohms depending on wattage. An open (infinite) reading means it's burned out. The heater depends on your cooling unit's serial number: below 11231023 is the 621702, and above is the 638374. If the heater is good, check whether the board sends 120V to it when it calls for AC.
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