OEM Carrier Defrost Control Board HK32EA003 for Model PH3GNAA42000AA

This is the OEM factory-specified defrost control board (part number HK32EA003) for the Carrier PH3GNAA42000AA packaged heat pump. The defrost control board manages the timing and logic of the heat pump's defrost cycle — periodically reversing refrigerant flow to clear frost and ice buildup from the outdoor coil. When this board fails, the outdoor coil can ice over completely, causing the system to lose heating capacity, short-cycle, or shut down entirely. A faulty board may also prevent the unit from ever entering defrost mode, leading to progressive coil blockage and compressor strain.

• OEM Part Number: HK32EA003 | Also supersedes / cross-references: HK32EA008, CEPL130433-01, CEBD430433-08A, CES0130076-00, 1185790
• OEM vs Generic: This OEM board is factory-matched to the PH3GNAA42000AA's control circuit, ensuring exact defrost interval timing (30/60/90/120 min selectable) and proper relay sequencing. Aftermarket boards vary in tolerance and may introduce noise glitches during defrost transitions.
• Install Difficulty: 3/5 — Shut off power at the disconnect before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter, and a phone or camera to photograph all wiring connections before removal. The board mounts on a standard DIN rail or standoffs inside the control compartment. Discharge any capacitors and verify zero voltage before touching terminals.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse — no waiting on special orders.

Compatibility: Designed for the Carrier PH3GNAA42000AA packaged heat pump. Cross-compatible with Bryant and Payne models sharing the CEPL130433-01 board footprint — always verify your existing board's part number and terminal layout before ordering. Not sure? Our HVAC parts specialists confirm fitment before you buy. Order now — in stock and ships today.