OEM Carrier Single-Pole Contactor HN51KB024 for Model PH12NA018000ADAA

This is the factory OEM replacement contactor for the Carrier PH12NA018000ADAA heat pump system. The contactor is the high-voltage relay that controls power delivery to the compressor and condenser fan motor whenever the thermostat calls for cooling or heating. When the contactor fails, the outdoor unit will not energize — symptoms include the system failing to start, a buzzing or chattering sound from the contactor coil, or pitted/burned contact points that cause intermittent or total loss of operation. Replacing a failed contactor promptly prevents compressor damage from voltage fluctuations and arcing.

• Specs: 1 Pole (Single-Pole) | 24V AC 50/60Hz Coil | 25A Full Load Amps (FLA) | OEM Part Number: HN51KB024 | Factory-original construction for exact-fit installation
• OEM vs Generic: This is a genuine OEM Carrier contactor manufactured to precise coil pull-in voltage and contact rating tolerances. Generic aftermarket contactors frequently use substandard contact materials that pit and burn faster, shortening compressor life and causing nuisance lockouts.
• Install Difficulty: 2/5 — Always disconnect power at the breaker and capacitor before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V coil signal and confirm open/closed contacts). Photograph all wiring connections before removal.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Verified factory fit for Carrier model PH12NA018000ADAA. Always cross-reference the OEM part number on your unit's data plate or wiring diagram before ordering. Our expert team is available to confirm fitment — contact us before you order if you have any questions.