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Carrier

OEM Carrier Transformer EFS0040003 for Model FA4ANF048000AGAA

SKU: carrier-transformer-fa4anf048000agaa Brand: Carrier
$59.95

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

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OEM Carrier Transformer EFS0040003 for Model FA4ANF048000AGAA

This OEM Carrier transformer (EFS0040003) supplies the critical 24V low-voltage power that drives the controls, relays, and thermostat circuit on your Carrier FA4ANF048000AGAA fan coil. When a transformer fails, the entire low-voltage system goes dead: the thermostat won't power up, contactors won't pull in, and the unit won't respond. Often a failed transformer is the result of a short elsewhere, so inspect the control circuit before replacing. This genuine Carrier transformer provides the exact primary and secondary voltage ratings and VA capacity specified for the FA4ANF048000AGAA, ensuring stable control power that generic units may not match. Installation is straightforward for a qualified HVAC technician and usually takes 20-30 minutes: disconnect power, label and transfer the primary and secondary leads, and mount the new transformer securely. Always confirm the source of the original failure to protect the new part. Restore dependable low-voltage power to your air handler with the correct OEM component. Order before 3PM CST and your genuine Carrier transformer ships the same day.

Compatibility

This part is compatible with Carrier model FA4ANF048000AGAA.

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 FA4ANF048000AGAA?
Yes. This is the factory-specified OEM transformer for the Carrier Model FA4ANF048000AGAA. 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 FA4ANF048000AGAA?
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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