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You will need to replace the defrost heater to fix this.
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And you replaced the thermostat?
At room temperature, it should be open (Infinite ohms)
Unfortunately with the thermostat and defrost heater working properly then the main control board is at fault and would need to be replaced.
No there is no way to test the board.
Not a problem. Just also make sure all connections are making contact and not froze causing a poor connection.
I see this question is still open. Do you need more help?
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