OEM Carrier Contactor 2-Pole 24V Coil for Model PH11JA042000AAAA

This OEM contactor (part number HN51KC024) is the factory-specified replacement for the Carrier PH11JA042000AAAA heat pump system. The contactor functions as a high-voltage relay, receiving a 24V signal from the control board and switching line voltage (typically 208–240V) to power the compressor and condenser fan motor. When a contactor fails, the system may hum without starting, fail to energize at all, or run continuously even when the thermostat signals it to shut off — symptoms caused by pitted or welded contact points that degrade over years of cycling.

• Specs: 2-pole configuration | 24V AC coil voltage | Designed for 208–240V load circuits | Factory-matched contact gap and spring tension for reliable switching
• OEM vs Generic: This is a genuine OEM Carrier part (HN51KC024), built to exact factory tolerances. Generic contactors often use lower-grade contact materials that pit faster under high-current switching loads, leading to premature failure and potential compressor damage.
• Install difficulty: 3/5 — Always disconnect power at the disconnect box and verify zero voltage with a multimeter before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal. Contactor replacement is a common DIY repair but requires safe high-voltage work practices.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered specifically for the Carrier PH11JA042000AAAA heat pump. Always verify coil voltage and pole configuration against your unit's wiring diagram and data plate before ordering. Our fitment team is available to confirm compatibility before you purchase — ships fast from our stocked warehouse.