OEM Carrier Contactor HN51KB024 for Model PH1PNB036000AAAA

This is the factory-specified OEM contactor for the Carrier PH1PNB036000AAAA heat pump system. The contactor is a high-voltage relay that controls power delivery to the compressor and condenser fan motor. When the thermostat calls for cooling or heating, the 24V control circuit energizes the contactor coil, closing the high-voltage contacts and allowing the unit to run. A failed contactor is one of the most common reasons a heat pump will not start — symptoms include a unit that hums but won't run, contacts that are visibly pitted or burned, or a system that runs continuously without shutting off due to welded contacts.

• Specs: OEM Part Number HN51KB024 | 2-Pole design | 24V coil voltage | Factory-matched contact rating for Carrier PH1PNB036000AAAA
• OEM vs Generic: This is a genuine OEM Carrier contactor manufactured to exact factory specifications. Generic aftermarket contactors often use lower-grade contact materials that pit and weld faster under load, shortening equipment life and risking compressor damage.
• Install difficulty: 2/5 — Always disconnect and lock out power at the disconnect box before servicing. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wiring before disconnecting terminals. Verify coil voltage with a multimeter before powering up.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model PH1PNB036000AAAA heat pump systems. Always verify the OEM part number on your existing contactor label and confirm coil voltage before ordering. Our technical team is available to verify fitment — reach out before you order if you have any questions. Order today and get same-day shipping!