OEM Carrier Contactor 2-Pole 24V for Model PH14NB018000AAAA (HN51KC024)

This OEM contactor is the factory-specified replacement for the Carrier PH14NB018000AAAA heat pump system. The contactor is a high-voltage relay controlled by the 24V signal from your thermostat — it closes to send line voltage to the compressor and condenser fan motor every time a cooling or heating call is made. A worn or failed contactor is one of the most common reasons an HVAC system won't start: symptoms include a humming unit with no compressor engagement, pitted or burned contacts, or a system that runs continuously without shutting off.

• Specs: 2-pole configuration | 24V AC coil voltage | 30–40A rating | OEM Part Number HN51KC024 | Factory-matched contact material and coil pull-in voltage for reliable switching
• OEM vs Generic: This is a genuine Carrier OEM contactor. OEM units use factory-grade contact alloys rated for the exact load cycles of your system, whereas generic contactors often use inferior contact materials that pit and weld faster under high-inrush compressor loads.
• Install Difficulty: 3/5 — Line voltage (240V) is present at the contactor even when the system is off. Always shut off the disconnect and confirm voltage is absent with a multimeter before beginning work. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before disconnecting.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed specifically for the Carrier PH14NB018000AAAA heat pump. Always verify OEM part number HN51KC024 against your unit's data plate or existing contactor label before ordering. Not sure it fits? Our HVAC parts specialists are available to confirm fitment before you purchase — get in touch today and we'll ship it out the same day.