OEM Carrier Defrost Control Board CESO110063-02 for Model HC1AJX042000AAAA

This is the factory OEM defrost control board (part number CESO110063-02) designed as a direct replacement for the Carrier HC1AJX042000AAAA heat pump condenser. The defrost control board monitors outdoor coil temperature and ambient conditions to initiate and terminate defrost cycles automatically. When this board fails, the outdoor coil can ice over completely, drastically reducing heating efficiency or causing the system to lock out entirely. Common symptoms include the unit running in continuous defrost, never entering defrost, or failing to produce adequate heat during cold weather operation.

• Specs: OEM part number CESO110063-02 | Factory-programmed defrost timing and termination logic | 24V control circuit compatible | Direct drop-in replacement — no rewiring required
• OEM vs Generic: This is a genuine Carrier OEM board with factory-calibrated defrost algorithms specific to the HC1AJX042000AAAA platform. Aftermarket boards may use generic timing intervals that cause premature defrost termination or excessive icing, shortening compressor life and increasing energy costs.
• Install difficulty: 3/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone or camera for wiring photos. Transfer all low-voltage control wires one at a time to avoid miswiring. Reattach mounting standoffs carefully to avoid cracking the new board.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier HC1AJX042000AAAA heat pump condenser unit. Always cross-reference the OEM part number CESO110063-02 printed on your existing board before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required. In stock and ready to ship today.