OEM Carrier 2-Pole Contactor 24V for Model PH2PNB036000AA (HN51KB024)

This OEM contactor (part number HN51KB024) is the factory-specified replacement for the Carrier PH2PNB036000AA heat pump system. The contactor acts as the primary high-voltage switching relay in your outdoor unit — it receives a 24V signal from the thermostat and closes to send 240V line power to the compressor and condenser fan motor. When the contactor fails, the most common symptom is an outdoor unit that simply will not energize: you may hear the thermostat calling for cooling or heating but the condenser stays completely silent, or the contacts weld closed causing the unit to run continuously even when not called.

• Specs: 2-Pole configuration | 24V AC coil voltage | Factory-matched contact rating | OEM part number HN51KB024 — drop-in replacement, no modification required
• OEM vs Generic: This is the genuine Carrier OEM contactor, manufactured to exact factory specifications. Generic contactors often use lower-grade contact materials that pit and burn faster under high-amperage cycling loads, shortening compressor life and risking welded contacts.
• Install difficulty: 3/5 — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, multimeter. Photograph all wiring before disconnecting — line, load, and coil terminals must be correctly identified. Verify contacts are fully open at rest before energizing.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH2PNB036000AA heat pump. Always verify coil voltage (24V) and pole count against your unit's wiring diagram and data plate before ordering. Our parts specialists are available to confirm fitment before you buy — no guesswork required. Order today for same-day shipping.