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OEM Carrier Contactor 24V Coil 2-Pole for PH12NA030000ACAA
Carrier

OEM Carrier Contactor 24V Coil 2-Pole for PH12NA030000ACAA

SKU: CARRIE-PH12NA030000ACAA-CONTACTOR-HN51KB024 Brand: Carrier
✓ Guaranteed to fit PH12NA030000ACAA — 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 PH12NA030000ACAA

This OEM replacement contactor (part number HN51KB024) is the factory-specified high-voltage relay for the Carrier PH12NA030000ACAA heat pump system. The contactor acts as the primary switching device that allows the 24V thermostat signal to energize the compressor and condenser fan motor at line voltage. When the contactor fails — due to pitted contacts, a worn coil, or contact welding — the system will either refuse to start entirely, run continuously without responding to the thermostat, or produce an audible chattering or buzzing from the electrical panel area of the unit.

  • Specs: 24V coil voltage | 2-pole design | Factory-rated amperage matched to PH12NA030000ACAA | OEM part number HN51KB024 — direct drop-in replacement, no modifications required
  • OEM vs Generic: This OEM contactor uses factory-spec contact materials and coil windings, ensuring proper pull-in voltage and rated contact life. Generic contractors can exhibit premature contact pitting and inconsistent coil resistance, leading to early failure and compressor damage.
  • Install Difficulty: 3/5 — Work must be performed with the disconnect pulled and capacitor fully discharged. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, multimeter. Always photograph all high-voltage wiring connections before disconnecting. Recommend verifying coil draw with a multimeter after installation.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed before cut-off ship same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model PH12NA030000ACAA heat pump systems. Always verify coil voltage and pole configuration against your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — contact us before placing your order.

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 PH12NA030000ACAA?
Yes. This is the factory-specified OEM contactor for the Carrier PH12NA030000ACAA. 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 PH12NA030000ACAA?
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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