OEM Carrier Defrost Control Board HK32EA008 for Model PH4GPAA60000AA

This is the genuine OEM Carrier defrost control board (part number HK32EA008), the factory-specified replacement for the Carrier PH4GPAA60000AA heat pump. The defrost control board monitors outdoor coil temperature sensors and automatically switches the system between heating and defrost modes to prevent frost and ice buildup on the outdoor coil. When this board fails, common symptoms include the outdoor coil freezing solid, the system staying locked in defrost mode, erratic defrost cycling, or no defrost activity at all — all of which severely degrade heating efficiency and can lead to compressor damage if left unresolved.

• Specs: Genuine OEM part HK32EA008 | Replaces HK32EA003 | Selectable defrost intervals: 30, 60, 90, and 120 minutes | Compatible with Carrier, Bryant, and Payne heat pump platforms | Includes speedup jumper for field testing
• OEM vs Generic: This OEM board is manufactured by Carrier to exact factory tolerances, ensuring full compatibility with the PH4GPAA60000AA's sensor inputs and control sequencing. Aftermarket boards may not support Quiet Shift Technology or the full range of adjustable timing intervals, risking noisy transitions and premature wear.
• Install Difficulty: 3/5 — Shut off power at the disconnect and breaker before starting. Tools needed: Phillips and flathead screwdrivers, needle-nose pliers, phone/camera to photograph wiring before disconnection. Board mounts to the outdoor unit control panel; transfer wiring connector by connector. Verify defrost operation with the speedup jumper before closing the panel.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH4GPAA60000AA heat pump. Also cross-references to Bryant and Payne heat pump models sharing the HK32EA003 / HK32EA008 board specification. Always confirm your existing board's part number against your unit's wiring diagram before ordering. Need help verifying fitment? Our HVAC parts specialists confirm compatibility before you buy.