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Carrier

OEM Carrier Transformer 40VA 24V for Model FB4CNF030008ABAA Unit

SKU: carrier-transformer-fb4cnf030008abaa Brand: Carrier
$49.95

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

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OEM Carrier Transformer 40VA 24V for Model FB4CNF030008ABAA Unit

This genuine Carrier control transformer delivers the 24-volt power your FB4CNF030008ABAA fan coil requires to drive its thermostat, control board, and switching relays. Transformers are a common failure point, and when one goes out the entire system usually loses power with a blank thermostat and no cooling response, making this a key diagnostic and repair part. Engineered to exact OEM Carrier specifications, the replacement matches the original primary and secondary windings and mounting position, so it installs without rewiring, splicing, or bracket modifications. A technician or experienced homeowner can typically complete the job in roughly 30 minutes using a screwdriver and nut driver after shutting off power at the disconnect. Using the authentic part shields your control board from damage and keeps your Carrier equipment operating to factory standards and warranty terms. Verify the VA rating of the old transformer before ordering. Orders placed before 3PM CST ship the same business day from our US warehouse. Protected by our fit guarantee for the FB4CNF030008ABAA fan coil.

Compatibility

This part is compatible with Carrier model FB4CNF030008ABAA.

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 FB4CNF030008ABAA Unit?
Yes. This is the factory-specified OEM transformer for the Carrier Model FB4CNF030008ABAA 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 FB4CNF030008ABAA 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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