OEM Carrier Defrost Control Board HK32EA001 for Model PH12NA024000AGAA

This is the genuine OEM Carrier defrost control board (part number HK32EA001), the factory-specified replacement for the Carrier PH12NA024000AGAA heat pump. The defrost control board monitors outdoor coil temperature and time intervals to initiate and terminate defrost cycles automatically. When this board fails, the outdoor coil will ice over progressively — leading to severely reduced heating capacity, continuous frost accumulation, or a complete system lockout. A faulty defrost board is often misdiagnosed as a refrigerant issue, so confirm defrost sensor and thermostat function before replacing.

• Specs: 24V control circuit | Single-phase | Board dimensions approx. 6" × 4" | Cross-references: CEPL130524-01, CEBD430524-06A, 151922 | Factory-matched relay and timing logic
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part. OEM boards use factory-calibrated defrost timing and relay ratings. Aftermarket boards may use off-spec relays or incorrect defrost intervals, leading to compressor stress or premature coil re-icing.
• Install difficulty: 3/5 — Disconnect power at the breaker before servicing. Photograph all wire harness connections before removal. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone or camera for wiring reference. Snap-in board mounts; no soldering required.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PH12NA024000AGAA heat pump split systems. Also fits select Bryant and Payne heat pump models sharing the HK32EA001 board specification. Always verify your existing board's part number on the board label before ordering to ensure correct fitment. Have questions? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.