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Carrier

OEM Carrier Transformer for Model FC4BNB042000AGAA Fan Coil Unit

SKU: carrier-transformer-fc4bnb042000agaa Brand: Carrier
$44.95

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

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OEM Carrier Transformer for Model FC4BNB042000AGAA Fan Coil Unit

This OEM Carrier transformer is the exact replacement control transformer for the FC4BNB042000AGAA fan coil unit, stepping line voltage down to the 24V low-voltage power your thermostat, control board, and contactor rely on. When your system goes completely dead, blows low-voltage fuses, or the thermostat screen is blank, a failed transformer is one of the most common culprits. This factory-spec part is built to Carrier's original electrical ratings to ensure reliable, safe operation and protect downstream controls. It is a direct fit for the FC4BNB042000AGAA, so there is no guesswork on voltage or mounting. Installation is moderate difficulty and best handled by an HVAC technician: disconnect power, note the wire colors, and transfer the primary and secondary leads to the new transformer. Using genuine OEM hardware preserves your equipment warranty and avoids the mismatched ratings common with universal parts. In stock and ready to go. Orders placed before 3PM CST ship same-day so you can get your fan coil back online fast.

Compatibility

This part is compatible with Carrier model FC4BNB042000AGAA.

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 Transformer fit my Carrier Model FC4BNB042000AGAA Fan Coil Unit?
Yes. This is the factory-specified OEM transformer for the Carrier Model FC4BNB042000AGAA Fan Coil Unit. 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 transformer on my Carrier Model FC4BNB042000AGAA Fan Coil Unit?
Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.
My thermostat has no power. What failed?
Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.
Is this transformer 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 transformer?
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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