OEM Carrier Defrost Control Board HK32EA007 for Model PH3ZNB036000AA

This is the genuine OEM Carrier defrost control board (part number HK32EA007), factory-specified for the Carrier PH3ZNB036000AA heat pump. The defrost control board monitors outdoor coil temperature and initiates timed defrost cycles to shed ice buildup from the evaporator coils — a critical function in any heat pump operating in cold climates. When this board fails, symptoms include excessive ice accumulation on the outdoor coil, the unit running in permanent heating or cooling mode without reversing, or the heat pump locking out entirely due to incomplete defrost cycles.

• Part Specs: OEM Part No. HK32EA007 | Replaces cross-reference numbers 1173636 and 1177927 | Factory-matched timing and temperature logic for Carrier heat pump defrost sequences
• OEM vs Generic: This is a genuine Carrier board — not an aftermarket clone. OEM boards carry factory-calibrated defrost timing and coil sensor thresholds. Generic boards may ship with incorrect defrost intervals, leading to premature compressor wear or recurring icing.
• Install Difficulty: 3/5 — Turn off power at the disconnect and breaker before beginning. Tools needed: Phillips and flathead screwdrivers, needle-nose pliers, phone/camera to photograph all wiring connections prior to removal. Label all wires before disconnecting. The board mounts inside the air handler cabinet; allow 30–60 minutes for a careful swap.
• Warranty: 1-year OEM manufacturer warranty from date of purchase. Ships same business day from our warehouse when ordered by cutoff.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH3ZNB036000AA heat pump. This board also cross-references HK32EA001 in many Carrier, Bryant, and Payne heat pump applications — always verify your existing part number against the unit's wiring diagram before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy. Order now — in stock and ships today.