OEM Carrier Defrost Control Board HK32EA001 for Model PH4RNG018000BBAA

This is the genuine OEM defrost control board (part number HK32EA001), the factory-specified replacement for the Carrier PH4RNG018000BBAA heat pump. The defrost control board monitors outdoor coil temperature and run time, then initiates and terminates the defrost cycle to prevent frost and ice buildup on the outdoor coil. When this board fails, the heat pump may run continuously in defrost mode, never enter defrost at all, or ice over completely — resulting in severely reduced heating efficiency or a full system lockout.

• OEM Part Number: HK32EA001 | Cross-references: CEPL130524-01, CEBD430524-06A, 1173636, 1177927 | Factory-authorized Carrier replacement part
• OEM vs Generic: This is a genuine OEM board manufactured to exact Carrier factory specifications. Generic aftermarket boards often use off-tolerance timing components, leading to premature cycling failures or defrost timing errors that accelerate compressor wear.
• Install Difficulty: 3/5 — Disconnect power at the breaker before opening the control panel. Tools needed: Phillips and flathead screwdrivers, needle-nose pliers, multimeter. Photograph all wiring harness connections before disconnecting. Verify defrost time-selection jumper setting matches your system's original configuration before powering up.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PH4RNG018000BBAA heat pump. Also compatible with select Carrier, Bryant, and Payne heat pump models using the HK32EA001 defrost board — verify your unit's data plate and wiring diagram before ordering. Our fitment team is available to confirm compatibility before you buy. Order today for same-day shipping.