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OEM Carrier Contactor 24V Coil 2-Pole for PH11JA018000AAAA
Carrier

OEM Carrier Contactor 24V Coil 2-Pole for PH11JA018000AAAA

SKU: CARRIE-PH11JA018000AAAA-CONTACTOR-HN51KB024 Brand: Carrier
✓ Guaranteed to fit PH11JA018000AAAA — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 2-Pole Contactor 24V Coil (HN51KB024) for Model PH11JA018000AAAA

This is the factory OEM replacement contactor for the Carrier PH11JA018000AAAA heat pump system. The contactor is the high-voltage switching relay that receives a 24V signal from the thermostat or control board and closes the circuit to energize the compressor and condenser fan motor. When the contactor fails — due to burned contacts, a stuck armature, or a failed coil — the outdoor unit will not start even though the thermostat is calling for cooling or heating. In some cases, a failed contactor can also weld shut, causing the unit to run continuously regardless of thermostat demand.

  • Specs: 2-Pole configuration | 24V AC coil voltage | Factory-rated amperage for Carrier PH11JA018000AAAA | OEM part number HN51KB024
  • OEM vs Generic: This OEM contactor features factory-spec silver-alloy contact points rated for exact load tolerances of your system. Generic contactors often use lower-grade contacts that arc and pit faster, leading to premature failure and potential compressor damage.
  • Install difficulty: 3/5 — Always disconnect power at the breaker and confirm voltage is absent with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal.
  • Warranty: 1-year OEM manufacturer warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed specifically for the Carrier PH11JA018000AAAA heat pump. Always verify coil voltage and pole configuration against your unit's wiring diagram and data plate before ordering. Need fitment confirmation? Our HVAC parts specialists are standing by — we verify compatibility before you buy.

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 PH11JA018000AAAA?
Yes. This is the factory-specified OEM contactor for the Carrier PH11JA018000AAAA. 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 PH11JA018000AAAA?
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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