Also if it where the circuit board that had gone bad. Your furnace would not turn on at all not even the blower motor. You can test them both by looking for 24 volts to the board, and 120 volts per leg of the contactor
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Also if it where the circuit board that had gone bad. Your furnace would not turn on at all not even the blower motor. You can test them both by looking for 24 volts to the board, and 120 volts per leg of the contactor