If there is not 24 volts present then I would check at the furnace for 24 volts between the Y terminal and the W terminal on the furnace control board. If the reading is 24 volts and the contactor is not engaged, then it is a bad contactor. Placing a meter probe on each terminal, the reading should read 24 volts between them. The two small wires (often colored yellow & white) usually attach at either side of the side of the contactor. I would start by using a multimeter to check for 24 volts at the contactor.
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