The total cost to replace a faulty heat pump defrost control board typically ranges from two hundred to five hundred dollars when hiring a licensed HVAC professional, which includes the cost of the replacement part, diagnostic labor, and service call fees. The standalone defrost board part itself generally costs between one hundred and two hundred and fifty dollars, depending on whether you purchase a universal aftermarket model or a specialized OEM board designed for a specific HVAC manufacturer. Additional labor charges can vary based on your geographic location and whether the repair is performed during regular business hours or as an urgent after-hours emergency call. You can verify that the replacement defrost board was successfully installed and calibrated by testing the system's ability to initiate, run through, and terminate a complete defrost cycle without locking up.
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