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OEM Carrier Contactor 1-Pole 24V 25A for PH12NA018000ADAA
Carrier

OEM Carrier Contactor 1-Pole 24V 25A for PH12NA018000ADAA

SKU: CARRIE-PH12NA018000ADAA-CONTACTOR-HN51KB024 Brand: Carrier
✓ Guaranteed to fit PH12NA018000ADAA — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Single-Pole Contactor HN51KB024 for Model PH12NA018000ADAA

This is the factory OEM replacement contactor for the Carrier PH12NA018000ADAA heat pump system. The contactor is the high-voltage relay that controls power delivery to the compressor and condenser fan motor whenever the thermostat calls for cooling or heating. When the contactor fails, the outdoor unit will not energize — symptoms include the system failing to start, a buzzing or chattering sound from the contactor coil, or pitted/burned contact points that cause intermittent or total loss of operation. Replacing a failed contactor promptly prevents compressor damage from voltage fluctuations and arcing.

  • Specs: 1 Pole (Single-Pole) | 24V AC 50/60Hz Coil | 25A Full Load Amps (FLA) | OEM Part Number: HN51KB024 | Factory-original construction for exact-fit installation
  • OEM vs Generic: This is a genuine OEM Carrier contactor manufactured to precise coil pull-in voltage and contact rating tolerances. Generic aftermarket contactors frequently use substandard contact materials that pit and burn faster, shortening compressor life and causing nuisance lockouts.
  • Install Difficulty: 2/5 — Always disconnect power at the breaker and capacitor before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V coil signal and confirm open/closed contacts). Photograph all wiring connections before removal.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Verified factory fit for Carrier model PH12NA018000ADAA. Always cross-reference the OEM part number on your unit's data plate or wiring diagram before ordering. Our expert team is available to confirm fitment — contact us before you order 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 PH12NA018000ADAA?
Yes. This is the factory-specified OEM contactor for the Carrier PH12NA018000ADAA. 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 PH12NA018000ADAA?
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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