OEM Carrier Defrost Control Board CESO110063-02 for Model HC1AJX048000AAAA

This is the factory OEM defrost control board (part number CESO110063-02) engineered specifically for the Carrier HC1AJX048000AAAA heat pump system. The defrost control board manages the automatic defrost cycle — monitoring outdoor coil temperature and initiating timed defrost sequences to prevent ice buildup that would otherwise choke airflow and cripple heating capacity. When this board fails, common symptoms include the outdoor unit freezing solid, the system failing to enter or exit defrost mode, erratic short-cycling, or a complete loss of heating output. Replacing the defrost control board with the correct OEM part restores precise timing and sensor logic that aftermarket boards routinely fail to replicate.

• Specs: OEM Part Number CESO110063-02 | Defrost control function | Compatible with 4-ton (048) configuration | Factory-calibrated defrost timing and temperature thresholds | 24V control circuit compatible
• OEM vs Generic: The OEM CESO110063-02 board is programmed to Carrier's exact defrost initiation and termination parameters. Generic control boards frequently use generalized timing logic that results in premature or delayed defrost cycles, leading to compressor strain and reduced system efficiency.
• Install difficulty: 3/5 — Disconnect power at the disconnect box and verify zero voltage before starting. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter, phone or camera to photograph all wiring connections prior to removal. Board mounts to existing standoffs; all connectors are keyed for correct reinstallation.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Designed for the Carrier HC1AJX048000AAAA heat pump (4-ton R-22 or R-410A configuration — verify your unit's data plate and refrigerant type before ordering). Always cross-reference the OEM part number CESO110063-02 on your existing board before purchasing. Have questions about fitment? Our HVAC parts specialists verify compatibility before your order ships — contact us today and get your system back online fast.