OEM Carrier Defrost Control Board HK32EA007 for Model PH4GNAB48000AA

This is the genuine OEM defrost control board (part number HK32EA007), factory-specified for the Carrier PH4GNAB48000AA heat pump. The defrost control board monitors outdoor coil temperature and initiates timed defrost cycles to remove ice and frost buildup from the evaporator coil. When this board fails, you'll typically experience a heat pump that stays locked in cooling mode during cold weather, a system that never initiates a defrost cycle, or a unit that short-cycles with an associated fault lockout. Replacing this board with a genuine OEM part restores factory-precise defrost timing and temperature logic.

• Part Number: HK32EA007 | Also cross-references: 1177927, 1173636 | OEM Carrier / Bryant / Payne heat pump defrost board
• OEM vs Generic: Genuine OEM boards ship with factory-programmed defrost timing intervals and original-spec solid-state components. Aftermarket boards may use looser timing tolerances, leading to premature coil icing or overly frequent defrost cycles that reduce system efficiency.
• Install Difficulty: 3/5 — Requires safe lockout/tagout of power before accessing the control panel. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone/camera to document wiring harness positions before removal. Label all connectors before disconnecting. Follow all Carrier wiring diagrams in the unit's service manual.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PH4GNAB48000AA packaged heat pump unit. Cross-compatible with select Carrier, Bryant, and Payne heat pump models that specify the HK32EA007 defrost control board — always verify against your unit's data plate and wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment. Order today and receive same-day shipping on in-stock inventory.