What amp contactor do I need for my Carrier system?

The correct replacement for Carrier model PH10JA018000ACAA is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Carrier equipment which lists the model number PH10JA018000ACAA.

My AC clicks but the compressor does not turn on. What is wrong?

Clicking from the outdoor unit without the compressor starting usually means a worn contactor. The contactor is the relay that sends power to the compressor. When its contacts are pitted or worn, it clicks but cannot establish a solid electrical connection. Other symptoms: visible pitting or burn marks on the contactor face, AC works intermittently, or buzzing from the contactor.

Is this contactor compatible with Bryant or Payne systems too?

Many Carrier parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Carrier

OEM Carrier Contactor 1-Pole 25A 24V for PH10JA018000ACAA

Name: OEM Carrier Contactor 1-Pole 25A 24V for PH10JA018000ACAA
Brand: Carrier
SKU: CARRIE-PH10JA018000ACAA-CONTACTOR-HN51KB024
Price: 21.00 USD
Availability: InStock

SKU: CARRIE-PH10JA018000ACAA-CONTACTOR-HN51KB024 Brand: Carrier

✓ Guaranteed to fit PH10JA018000ACAA — or your money back. Terms

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OEM Carrier 1-Pole Contactor HN51KB024 for Model PH10JA018000ACAA

This is the genuine OEM replacement contactor for the Carrier PH10JA018000ACAA packaged HVAC unit. The contactor is the high-voltage relay that receives the 24V signal from your thermostat and closes the circuit to power the compressor and condenser fan motor. When a contactor fails — whether due to burned contacts, a welded coil, or pitted contact points — your system either won't turn on at all, runs continuously without responding to thermostat commands, or trips the breaker repeatedly.

Specs: 1 Pole | 25A Full Load Amps (FLA) | 24V 50/60Hz Coil | Single-stage operation | Factory OEM part number HN51KB024
OEM vs Generic: Genuine OEM contactors use silver-alloy contact tips rated for the exact load cycles of your Carrier unit. Generic aftermarket contactors often use inferior contact materials that pit and burn faster, leading to premature failure and repeat service calls.
Install Difficulty: 2/5 — Always disconnect power at the breaker and wait 5 minutes before opening the contactor panel. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before disconnecting. Swap one wire at a time to avoid miswiring.
Warranty: 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PH10JA018000ACAA. Verify your existing contactor's pole count, amp rating, and coil voltage against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions.

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

OEM Carrier Contactor 1-Pole 25A...

$21.00

Frequently Asked Questions

Does this Contactor fit my Carrier PH10JA018000ACAA?

Yes. This is the factory-specified OEM contactor for the Carrier PH10JA018000ACAA. 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 PH10JA018000ACAA?

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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OEM Carrier Contactor 1-Pole 25A 24V for PH10JA018000ACAA

OEM Carrier 1-Pole Contactor HN51KB024 for Model PH10JA018000ACAA

Shipping Information

Return Policy

Frequently Asked Questions