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OEM Carrier 410A Contactor 24V Coil 2-Pole for PH12NA042000ACAA
Carrier

OEM Carrier 410A Contactor 24V Coil 2-Pole for PH12NA042000ACAA

SKU: CARRIE-PH12NA042000ACAA-CONTACTOR-HN51KC024 Brand: Carrier
✓ Guaranteed to fit PH12NA042000ACAA — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Contactor 24V Coil 2-Pole for Model PH12NA042000ACAA

This is the factory OEM replacement contactor (part number HN51KC024) for the Carrier PH12NA042000ACAA heat pump system. The contactor is the high-voltage relay that the thermostat's 24V control signal energizes to send line voltage to the compressor and condenser fan motor. When the contactor fails — whether from pitted contacts, a burned coil, or welded terminals — your system will either refuse to start entirely, run continuously without shutting off, or fail to deliver cooling and heating on demand.

  • Specs: 24V AC coil voltage | 2-pole configuration | Factory OEM replacement for Carrier HN51KC024 | Rated for R-410A system electrical loads
  • OEM vs Generic: This is a genuine OEM Carrier contactor built to exact factory specifications. OEM contacts resist pitting longer than generic equivalents and the coil is wound to precise 24V tolerances — critical for reliable thermostat-to-contactor signal response.
  • Install Difficulty: 3/5 — Always disconnect power at the disconnect box and verify zero voltage with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before removal. Line-voltage terminals require careful torquing — loose connections cause arcing and premature failure.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed by our daily cutoff ship the same business day from our stocked warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PH12NA042000ACAA heat pump. Confirm your existing contactor's coil voltage (24V) and pole count (2-pole) against your unit's wiring diagram and data plate before ordering. Our fitment team is available to verify compatibility before you purchase — don't hesitate to reach out.

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 PH12NA042000ACAA?
Yes. This is the factory-specified OEM contactor for the Carrier PH12NA042000ACAA. 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 PH12NA042000ACAA?
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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