OEM Carrier Defrost Control Board HK32EA003 for Model PH16NA04800GBAAA

This OEM defrost control board (part number HK32EA003) is the factory-specified replacement for the Carrier PH16NA04800GBAAA heat pump. The defrost control board manages the automatic defrost cycle — monitoring outdoor coil temperature and run time to periodically reverse refrigerant flow and melt ice accumulation off the outdoor coil. When this board fails, symptoms include excessive ice or frost buildup on the outdoor unit, a heat pump stuck in defrost mode, reduced heating efficiency, or a system that short-cycles and locks out entirely.

• Specs: OEM Part No. HK32EA003 | Defrost control board | 24V control circuit compatible | Direct factory replacement — no field modifications required
• OEM vs Generic: This is an authentic OEM Carrier board, programmed with factory defrost timing and termination logic. Generic aftermarket boards may use mismatched defrost intervals, leading to inefficient operation, coil icing, and potential compressor damage over time.
• Install difficulty: 3/5 — Requires disconnecting low-voltage control wiring harness and securing mounting fasteners. Tools needed: 1/4" nut driver, flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph all wiring connections before removal, and ensure power is fully disconnected at the disconnect box and breaker before beginning work.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH16NA04800GBAAA heat pump. Always verify the part number printed on your existing board before ordering to confirm fitment. If you're unsure, our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required.