OEM Carrier Defrost Control Board HK32EA001 for Model PH3ANA018000BBAA

This is the factory OEM replacement defrost control board for the Carrier PH3ANA018000BBAA heat pump system. The defrost control board manages the automatic defrost cycle that periodically melts frost and ice accumulation off the outdoor coil during heating operation. When this board fails, the outdoor coil can ice over completely, dramatically reducing system efficiency or causing the unit to shut down on a protection fault. Common failure symptoms include: no defrost cycle initiating, continuous frost/ice buildup on the outdoor coil, the system getting stuck in defrost mode, or erratic heat pump operation during cold weather.

• Specs: OEM Part Number HK32EA001 | Factory-direct defrost control board | Designed for Carrier PH3ANA018000BBAA heat pump | Direct drop-in replacement with factory-matched logic and timing parameters
• OEM vs Generic: This is a genuine OEM Carrier board, programmed with exact factory defrost timing and temperature thresholds. Aftermarket boards often use generic timing curves that can cause premature or delayed defrost cycles, reducing efficiency and potentially damaging the compressor over time.
• Install Difficulty: 3/5 — Requires disconnecting 24V and line-voltage control wiring harnesses. Tools needed: #2 Phillips screwdriver, 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter. Always disconnect power at the breaker and photograph all wiring connections before removal. Verify defrost thermostat and outdoor temperature sensor are functional before replacing the board.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our climate-controlled warehouse.

Compatibility: Directly fits Carrier model PH3ANA018000BBAA. Before ordering, confirm the OEM part number HK32EA001 on your existing board's label or in your unit's service documentation. Not sure if this is your part? Our HVAC parts specialists verify fitment before you order — contact us for a free confirmation.