OEM Carrier Defrost Control Board CESO110063-02 for Model HA1CJX018000AAAA

This is the factory OEM defrost control board (part number CESO110063-02) designed specifically for the Carrier HA1CJX018000AAAA heat pump system. The defrost control board monitors outdoor coil temperature and initiates timed defrost cycles to prevent ice buildup on the condenser coil during heating operation. When this board fails, symptoms typically include the outdoor unit freezing over completely, the system failing to initiate or complete a defrost cycle, erratic switching between heating and cooling modes, or a full system lockout with no heat output. Replacing this board with the correct OEM part restores precise defrost timing and protects your compressor from ice-related damage.

• Specs: OEM Part No. CESO110063-02 | Defrost Control Board | 24V control circuit compatible | Factory-programmed defrost logic for Carrier HA1CJX018000AAAA heat pump | Includes defrost termination and timed initiation control
• OEM vs Generic: OEM boards ship with factory-programmed firmware and exact termination/initiation timing. Aftermarket boards frequently use generic defrost intervals that cause premature coil icing, compressor short-cycling, and voided equipment warranties.
• Install Difficulty: 3/5 — Disconnect power at the breaker before beginning. Tools needed: Phillips and flathead screwdrivers, needle-nose pliers, multimeter, phone or camera to photograph wiring harness connections prior to removal. Snap a photo of all terminal connections before disconnecting. Most installs complete in 30–45 minutes.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our climate-controlled parts warehouse.

Compatibility: Engineered and factory-matched for the Carrier HA1CJX018000AAAA heat pump. Always verify your existing board's part number against CESO110063-02 before ordering. If you need fitment confirmation, our HVAC parts specialists are available to verify compatibility before your order ships — free of charge.