OEM Carrier Defrost Control Board HK32EA003 for Model PH3GPAA36000AA

This OEM defrost control board (part number HK32EA003) is the factory-specified replacement for the Carrier PH3GPAA36000AA heat pump package unit. The defrost control board manages the automatic defrost cycle, monitoring the outdoor coil temperature and run time to initiate and terminate defrost sequences. When this board fails, the outdoor coil may ice over completely, the system may lock out on fault codes, defrost cycles may never initiate, or the unit may get stuck in continuous defrost — all resulting in significant loss of heating efficiency or a complete system shutdown.

• Specs: OEM Part Number HK32EA003 | Factory-matched defrost timing and temperature thresholds | Direct board-for-board replacement | Compatible voltage and terminal configuration for Carrier PH3GPAA36000AA
• OEM vs Generic: This is a genuine OEM Carrier board — factory-programmed with exact defrost termination logic, temperature curves, and fault timing. Aftermarket boards often use generic defrost algorithms that cause premature or delayed defrost, shortening compressor life and reducing system efficiency.
• Install Difficulty: 3/5 — Requires disconnecting 24V and line-voltage connections from the existing board. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, a multimeter, and a phone or camera to photograph all wiring before removal. Turn off all power at the disconnect before servicing. Verify thermostat input signals post-install.
• Warranty: 1-year OEM factory warranty against defects. Orders ship same business day when placed before 3 PM local time.

Compatibility: Engineered for Carrier model PH3GPAA36000AA packaged heat pump units. Always verify the part number printed on your existing board before ordering. If you need fitment confirmation, our HVAC parts specialists are available to cross-reference your unit's data plate and board markings before you purchase.