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OEM Carrier Contactor 24V Coil 2-Pole for PH1PNB018000AAAA
Carrier

OEM Carrier Contactor 24V Coil 2-Pole for PH1PNB018000AAAA

SKU: CARRIE-PH1PNB018000AAAA-CONTACTOR-HN51KB024 Brand: Carrier
✓ Guaranteed to fit PH1PNB018000AAAA — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

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.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $99
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Contactor fit my Carrier PH1PNB018000AAAA?
Yes. This is the factory-specified OEM contactor for the Carrier PH1PNB018000AAAA. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the contactor on my Carrier PH1PNB018000AAAA?
Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Open condensing unit panel. Step 3: Photograph ALL wiring on the contactor. Step 4: Label each wire with tape. Step 5: Disconnect wires and remove old contactor. Step 6: Mount new contactor, reconnect wires matching your photo. Step 7: Restore power and test.
My AC clicks but the compressor won’t turn on. What’s wrong?
Clicking from the outdoor unit without the compressor starting = worn contactor. The contactor sends power to the compressor. When its contacts are pitted, it clicks but can’t make solid contact. Look for: visible pitting/burn marks on the contactor face, intermittent operation, or buzzing.
Is this contactor compatible with Bryant or Payne too?
Many Carrier parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Carrier contactor?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
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