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OEM Carrier 40A Contactor 2-Pole 24V for PH14NB018000AAAA — HN51KC024
Carrier

OEM Carrier 40A Contactor 2-Pole 24V for PH14NB018000AAAA — HN51KC024

SKU: CARRIE-PH14NB018000AAAA-CONTACTOR-HN51KC024 Brand: Carrier
✓ Guaranteed to fit HN51KC024 — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Contactor 2-Pole 24V for Model PH14NB018000AAAA (HN51KC024)

This OEM contactor is the factory-specified replacement for the Carrier PH14NB018000AAAA heat pump system. The contactor is a high-voltage relay controlled by the 24V signal from your thermostat — it closes to send line voltage to the compressor and condenser fan motor every time a cooling or heating call is made. A worn or failed contactor is one of the most common reasons an HVAC system won't start: symptoms include a humming unit with no compressor engagement, pitted or burned contacts, or a system that runs continuously without shutting off.

  • Specs: 2-pole configuration | 24V AC coil voltage | 30–40A rating | OEM Part Number HN51KC024 | Factory-matched contact material and coil pull-in voltage for reliable switching
  • OEM vs Generic: This is a genuine Carrier OEM contactor. OEM units use factory-grade contact alloys rated for the exact load cycles of your system, whereas generic contactors often use inferior contact materials that pit and weld faster under high-inrush compressor loads.
  • Install Difficulty: 3/5 — Line voltage (240V) is present at the contactor even when the system is off. Always shut off the disconnect and confirm voltage is absent with a multimeter before beginning work. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before disconnecting.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed specifically for the Carrier PH14NB018000AAAA heat pump. Always verify OEM part number HN51KC024 against your unit's data plate or existing contactor label before ordering. Not sure it fits? Our HVAC parts specialists are available to confirm fitment before you purchase — get in touch today and we'll ship it out the same day.

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 PH14NB018000AAAA — HN51KC024?
Yes. This is the factory-specified OEM contactor for the Carrier PH14NB018000AAAA — HN51KC024. 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 PH14NB018000AAAA — HN51KC024?
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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