OEM Carrier Defrost Control Board HK32EA007 for Model PH4GNAB36000AA

This is a genuine OEM Carrier defrost control board (part number HK32EA007), factory-specified for the Carrier PH4GNAB36000AA heat pump. The defrost control board governs the timing and initiation of defrost cycles, monitoring outdoor coil conditions and commanding the reversing valve and defrost relay to shed ice buildup from the evaporator coil. When this board fails, the outdoor coil becomes encased in ice, the system loses heating capacity, and in severe cases the heat pump will lock out entirely or run continuously in defrost without recovering.

• Specs: OEM Part # HK32EA007 | Also cross-references 1173636 & 1177927 | Designed for Carrier / Bryant / Payne heat pump split systems | Factory-matched defrost timing and temperature thresholds
• OEM vs Generic: This is a genuine Carrier OEM board with factory-calibrated defrost intervals. Aftermarket boards may use approximate timing logic that causes premature or delayed defrost, reducing efficiency and accelerating compressor wear over time.
• Install difficulty: 3/5 — Disconnect power at the disconnect and breaker before servicing. Tools needed: Phillips and flathead screwdrivers, needle-nose pliers, phone or camera to photograph wiring harness connections before removal. Board mounts to the control panel; all connectors are keyed for correct reinstallation.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our stocked warehouse.

Compatibility: Direct OEM replacement for Carrier PH4GNAB36000AA heat pump systems. Cross-references legacy part numbers 1173636 and 1177927. Always confirm your existing board's part number on the board label or unit data plate before ordering. Our fitment team is available to verify compatibility prior to purchase — order with confidence and get back to comfort fast.