OEM Carrier Contactor HN51KB024 for Model PH1PNB018000AAAA

This OEM contactor is the factory-specified replacement for the Carrier PH1PNB018000AAAA heat pump / split-system unit. The contactor is a high-voltage relay controlled by the 24V thermostat signal — when the thermostat calls for cooling or heating, the contactor closes to send 240V line power to the compressor and condenser fan motor. When it fails, the system will not respond to thermostat calls, may hum without starting, or may show signs of pitting and burning on the contact points.

• Specs: OEM Part Number HN51KB024 | 2-Pole design | 24V AC coil voltage | Factory-matched contact rating for Carrier PH1PNB018000AAAA — verify amperage on your unit data plate before ordering
• OEM vs Generic: This is a genuine OEM Carrier contactor manufactured to exact factory specifications. Generic contactors may use lower-grade contact materials that arc, pit, and weld closed sooner — causing compressor damage or stuck-on operation.
• Install difficulty: 3/5 — Always shut off power at the disconnect AND the breaker panel before servicing. Tools needed: flathead and Phillips screwdriver, 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wiring before disconnecting. Verify coil voltage with multimeter after install.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed for Carrier model PH1PNB018000AAAA. Always cross-reference the OEM part number HN51KB024 and confirm coil voltage and pole configuration against your unit's wiring diagram or data plate before ordering. Our fitment team is available to verify compatibility — reach out before you buy if you have any questions.