OEM Carrier 2-Pole 24V Contactor for Model PH12NA048000AGAA — Part HN51KC024

This is the factory-specified OEM replacement contactor for the Carrier PH12NA048000AGAA heat pump system. The contactor is a high-voltage relay that acts as the critical switching component between your thermostat's 24V control signal and the high-voltage power feeding your compressor and condenser fan. When the contactor fails or wears out, the most common symptom is an air conditioning or heat pump system that simply won't turn on — even though the thermostat is calling for cooling or heating. You may also notice pitting or burning on the contact points upon inspection.

• Specs: 2-Pole design | 24V coil voltage | Factory-matched amperage rating | Direct OEM replacement for part number HN51KC024
• OEM vs Generic: This OEM contactor meets Carrier's exact contact material, coil pull-in voltage, and current-handling specifications. Generic contactors often use inferior contact alloys that pit and weld faster under the high-inrush loads of a scroll compressor, leading to repeat failures.
• Install difficulty: 3/5 — Always disconnect and lock out power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, and a phone/camera to photograph all wiring before removal. Exercise extreme caution — capacitors nearby may still hold a lethal charge.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM fit for Carrier PH12NA048000AGAA heat pump units. Always verify your existing contactor's pole count, coil voltage, and amp rating against your unit's data plate before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.