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OEM Carrier Contactor HN51KC024 for Model HA1AJX018000ABAA
Carrier

OEM Carrier Contactor HN51KC024 for Model HA1AJX018000ABAA

SKU: carrier-contactor-ha1ajx018000abaa Brand: Carrier
$39.95

Order before 3PM CST — ships same day.
Standard delivery 2-5 business days. Express options at checkout.

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OEM Carrier Contactor HN51KC024 for Model HA1AJX018000ABAA

This OEM Carrier definite purpose contactor (HN51KC024) is the genuine factory replacement for the Carrier HA1AJX018000ABAA 1.5-ton condensing unit. The contactor acts as the electrical switch that energizes the compressor and outdoor fan motor each time the thermostat calls for cooling. When its contacts pit, weld shut, or fail to pull in, you'll see a humming unit, a no-start condition, or rapid short-cycling. This part matches Carrier's original 24V coil voltage, pole count, and amperage rating, so it mounts in the existing bracket and wires to the same line, load, and coil terminals without adapters. Replacement is a moderate job for a trained technician: kill power at the disconnect, document the wiring, move leads individually, and verify clean contact engagement. A genuine OEM contactor delivers the correct ampacity and dependable switching that keeps the compressor protected. In stock and ready to ship. Orders placed before 3PM CST go out the same business day, minimizing downtime. Fitment is guaranteed for the HA1AJX018 series so you can order with confidence.

Compatibility

This part is compatible with Carrier model HA1AJX018000ABAA.

Shipping

Same-day shipping before 3 PM CST. 30-day returns on uninstalled parts.

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 $75
  • 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 support@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Contactor fit my Carrier Model HA1AJX018000ABAA?
Yes. This is the factory-specified OEM contactor for the Carrier Model HA1AJX018000ABAA. 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 Model HA1AJX018000ABAA?
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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