OEM Carrier Defrost Control Board HK32EA008 for Model PH4GPAA36000AA

This is the genuine OEM defrost control board (part number HK32EA008), factory-specified for the Carrier PH4GPAA36000AA heat pump. The defrost control board monitors outdoor coil temperature sensors and governs the transition between heating and defrost modes, preventing frost and ice accumulation on the outdoor coil during cold-weather operation. When this board fails, common symptoms include the outdoor unit icing over completely, the system locking out of heating mode, erratic or non-existent defrost cycles, or the unit failing to recover from a defrost event and resuming normal heating.

• Specs: OEM part HK32EA008 | Replaces HK32EA003 | Selectable defrost intervals: 30 / 60 / 90 / 120 minutes | Includes speedup jumper for field testing | Optional random start timer to prevent simultaneous multi-unit defrost | 24V control circuit compatible
• OEM vs Generic: This is a genuine Carrier factory-authorized board manufactured to exact OEM specifications. Aftermarket defrost boards may lack Quiet Shift Technology and precise sensor calibration, resulting in noisy defrost transitions, premature coil wear, and shortened system life.
• Install Difficulty: 3/5 — Requires disconnecting 24V low-voltage wiring harness and outdoor unit power. Tools needed: nut driver set, needle-nose pliers, multimeter, and phone or camera to photograph wiring positions before removal. Verify jumper settings on the new board match your system's defrost interval requirements before reinstalling the panel.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PH4GPAA36000AA heat pump and also cross-compatible with select Bryant and Payne heat pump models sharing the HK32EA003 / HK32EA008 board specification. Always verify your unit's existing board part number against the data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy for peace of mind.