OEM Carrier Defrost Control Board CESO130076-00 / HK660003 for Model PH3GNA042000AA

This OEM Carrier defrost control circuit board is the factory-specified replacement for the Carrier PH3GNA042000AA heat pump. The defrost control board serves as the operational brain of your heat pump's defrost system — continuously monitoring sensors and safety switches, coordinating compressor operation, reversing valve sequencing, and executing timed defrost cycles to prevent coil icing. When this board fails, symptoms typically include the unit failing to enter or exit defrost mode, the system locking out entirely, erratic short-cycling, or a complete loss of heating and cooling function.

• OEM Part Numbers: CESO130076-00 (primary) | HK660003 (cross-reference) | Also cross-references: CEPL130492-01, HK50AA041 | Factory-direct Carrier replacement — not a third-party substitute
• OEM vs Generic: OEM boards are programmed with the exact defrost timing intervals, sensor thresholds, and fault-code logic specified by Carrier engineering. Aftermarket boards may use generalized firmware that can cause premature defrost cycling, missed fault codes, or compressor over-run — shortening the life of your system significantly.
• Install Difficulty: 3/5 — Requires disconnecting 24V control wiring and line-voltage harnesses. Always disconnect power at the breaker before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter (to verify 24VAC to board), and a phone camera to document wiring positions before removal. Transfer any jumper settings from the old board to the new one.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse in original Carrier factory packaging.

Compatibility: Engineered for the Carrier PH3GNA042000AA packaged heat pump. This board is also compatible with select Bryant and Payne heat pump models sharing the same control platform — verify your unit's data plate and existing part number before ordering. Our team is available to confirm fitment. Order now — in stock and ships today.