Same-day shipping on orders before 3PM CST · 15,000+ OEM Parts In Stock · Carrier · Bryant · ICP · Heil · Tempstar
Track Order | 1-800-NHP-HVAC | Trade Accounts

Menu

Home Shop All Account Cart
Home / OEM Carrier Contactor HN51KC024 for M...
OEM Carrier Contactor HN51KC024 for Model HA1BJX018000ACAA
Carrier

OEM Carrier Contactor HN51KC024 for Model HA1BJX018000ACAA

SKU: carrier-contactor-ha1bjx018000acaa Brand: Carrier
$34.95

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

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

OEM Carrier Contactor HN51KC024 for Model HA1BJX018000ACAA

This OEM Carrier HN51KC024 definite purpose contactor is the line-voltage switch that energizes the compressor and condenser fan motor in your HA1BJX018000ACAA air conditioner. When the thermostat calls for cooling, the 24V coil pulls in and closes the contacts; pitted, welded, or chattering contacts are a top cause of an outdoor unit that buzzes but won't engage. Manufactured to Carrier's exact amperage and coil-voltage specifications, this contactor mounts directly in the HA1BJX018000ACAA control box for a true drop-in replacement with no rewiring required. The repair is rated easy by most homeowners and techs at roughly 20-30 minutes: disconnect power, photograph the existing wiring, move the leads one at a time, and secure the new contactor. Installing a genuine OEM part preserves the rated load capacity and UL listing your system depends on, avoiding the early failures common with undersized generics. In stock and ready to ship same-day on orders placed before 3PM CST. Get dependable, quiet compressor engagement back with the correct Carrier-spec contactor the first time.

Compatibility

This part is compatible with Carrier model HA1BJX018000ACAA.

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 HA1BJX018000ACAA?
Yes. This is the factory-specified OEM contactor for the Carrier Model HA1BJX018000ACAA. 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 HA1BJX018000ACAA?
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.
Home Shop Search Account Cart