OEM Carrier Defrost Control Board CESO110063-02 for Model HA1BJX036000AAAA

This is the factory OEM defrost control board (part number CESO110063-02) for the Carrier HA1BJX036000AAAA heat pump system. The defrost control board manages the timed defrost cycle that prevents ice buildup on the outdoor coil during heating operation. When this board fails, common symptoms include a coil frozen solid with no defrost initiation, the system locking out on a fault code, erratic switching between heating and defrost modes, or the unit running continuously in defrost and failing to return to normal heating. Replacing this board with the genuine OEM part restores factory-programmed defrost timing and temperature thresholds.

• Specs: OEM Part No. CESO110063-02 | Defrost control board | 24V control circuit compatible | Factory-programmed defrost timing intervals | Designed for Carrier HA1BJX036000AAAA 3-ton heat pump
• OEM vs Generic: The OEM CESO110063-02 board is programmed to exact Carrier factory defrost parameters. Aftermarket boards may use generic timing intervals that cause over-defrosting, under-defrosting, or incompatible fault logic — leading to repeat service calls and reduced system efficiency.
• Install difficulty: 3/5 — Disconnect power at the breaker and verify zero voltage before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter, phone/camera for wiring photos. Photograph all wire connections and label terminals before removal. Ensure all harness connectors fully click into place on the new board.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: This board is the direct factory replacement for Carrier model HA1BJX036000AAAA. Always verify the OEM part number printed on your existing board before ordering to confirm fitment. If you are unsure whether this part matches your unit, our HVAC parts specialists can verify compatibility before you place your order — contact us via chat or phone.