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OEM Carrier 40A Contactor 2-Pole 24V Coil for C4850C50AJ03021 | National HVAC Parts
Carrier

OEM Carrier 40A Contactor 2-Pole 24V Coil for C4850C50AJ03021 | National HVAC Parts

SKU: CARRIE-C4850C50AJ03021-CONTACTOR-HN53CB115 Brand: Carrier

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 2-Pole Contactor 24V Coil for Model C4850C50AJ03021

This is the factory-specified OEM replacement contactor (part number HN53CB115) for the Carrier C4850C50AJ03021 packaged unit. The contactor is a high-voltage relay controlled by your thermostat's 24V signal — when the thermostat calls for cooling, the contactor closes its poles to send 240V power to the compressor and condenser fan motor. A failed contactor is one of the most common causes of an air conditioning system that won't respond to a cooling call, produces a loud buzzing or chattering noise, or shows a compressor that runs continuously even when the thermostat is satisfied.

  • Specs: 2-pole configuration | 24V AC coil voltage | 30–40 amp rated | 240V power circuit | Direct OEM replacement for part number HN53CB115
  • OEM vs Generic: OEM contactors use factory-matched coil windings and silver-alloy contact tips rated for the exact current load of your Carrier unit. Generic contactors often use lower-grade contact materials that arc and pit faster, leading to premature failure and potential compressor damage.
  • Install difficulty: 2/5 — Always disconnect power at the disconnect box and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wire connections before removal.
  • Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier C4850C50AJ03021 packaged unit. Always confirm your existing contactor's pole count, coil voltage, and amperage rating against your unit's data plate before ordering. Our parts specialists are available to verify fitment — reach out before you order if you have any questions. Order today and receive same-day shipping on all in-stock 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 info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Contactor fit my Carrier C4850C50AJ03021 | National HVAC Parts?
Yes. This is the factory-specified OEM contactor for the Carrier C4850C50AJ03021 | National HVAC Parts. 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 C4850C50AJ03021 | National HVAC Parts?
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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