OEM Carrier Defrost Control Board CESO110063-02 for Model HB1AJX036000AAAA

This is the factory OEM defrost control board (part number CESO110063-02) for the Carrier HB1AJX036000AAAA heat pump. The defrost control board manages the automatic defrost cycle, monitoring outdoor coil temperature and initiating timed defrost sequences to prevent ice buildup on the outdoor unit. When this board fails, symptoms typically include a continuously iced-over outdoor coil, the unit getting stuck in defrost mode, failure to switch between heating and cooling, or a complete system lockout with no heat output. Replacing the defrost control board with the correct OEM part restores proper cycle timing, temperature sensing logic, and reversing valve control.

• Specs: OEM Part No. CESO110063-02 | Defrost control board | Designed for Carrier HB1AJX036000AAAA 3-ton heat pump | Factory-programmed defrost timing and termination logic | 24V control circuit compatible
• OEM vs Generic: OEM boards ship with factory-calibrated defrost timing intervals and coil sensor thresholds. Aftermarket boards may use approximated logic that causes premature or delayed defrost cycles, reducing efficiency and risking compressor damage in cold weather operation.
• Install difficulty: 3/5 — Disconnect power at the breaker before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, and a multimeter for verification. Photograph all wire connections and terminal labels before removing the old board. Transfer connections one at a time to avoid miswiring. Always confirm power is off and capacitors are discharged before handling.
• Warranty: 1-year OEM manufacturer warranty against defects. In-stock units ship same business day from our warehouse when ordered before 3 PM local time.

Compatibility: This defrost control board is factory-specified for the Carrier HB1AJX036000AAAA heat pump (3-ton, single-stage). Verify your existing board's part number matches CESO110063-02 before ordering. Our HVAC parts specialists are available to confirm fitment — don't guess on a control board. Order today and get same-day shipping on this in-stock OEM part.