OEM Carrier Defrost Control Board HK32EA003 for Heat Pump Model PH3GNAA30000AA

This is the factory OEM defrost control board for the Carrier PH3GNAA30000AA heat pump. The defrost control board manages the automatic defrost cycle that prevents the outdoor coil from becoming encased in ice during heating operation. It monitors run time and outdoor coil temperature, then initiates and terminates defrost mode as needed. When this board fails, common symptoms include a heavily iced outdoor coil, a heat pump that never enters defrost mode, a unit stuck in continuous defrost, loss of heating capacity, or fault codes on the thermostat or air handler display.

• Specs: OEM Part Number HK32EA003 | Factory defrost control board | Direct drop-in replacement | Matched to Carrier PH3GNAA30000AA factory wiring harness and control logic
• OEM vs Generic: This is the genuine OEM Carrier board — not an aftermarket substitute. OEM boards use factory-programmed defrost timing and temperature thresholds. Aftermarket boards may have mismatched logic that causes short-cycling, improper defrost termination, or voided equipment warranties.
• Install Difficulty: 3/5 — Requires disconnecting and restoring multiple low-voltage control wiring connections. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone/camera for photographing wiring layout before removal. Always disconnect power at the disconnect box and confirm voltage is absent before handling the board.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model PH3GNAA30000AA heat pumps. Confirm your existing board's part number matches HK32EA003 before ordering. Not sure? Our fitment team is standing by to verify compatibility before you buy — same-day shipping available on in-stock orders.