Same-day shipping on orders before 3PM CST · 15,000+ OEM Parts In Stock · Carrier · Bryant · ICP · Heil · Tempstar
Track Order | 1-800-NHP-HVAC | Trade Accounts

Menu

Home Shop All Account Cart
Home / OEM Carrier Transformer Replacement P...

IMAGE COMING SOON

Carrier

OEM Carrier Transformer Replacement Part for Fan Coil Model FC4DNF030008AAAA

SKU: carrier-transformer-fc4dnf030008aaaa Brand: Carrier
$44.95

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

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

OEM Carrier Transformer Replacement Part for Fan Coil Model FC4DNF030008AAAA

This OEM Carrier transformer is the genuine replacement for the FC4DNF030008AAAA fan coil unit, stepping incoming line voltage down to the 24V control power that runs your thermostat, control board, and relays. A blown transformer leaves the low-voltage circuit dead, so the blower won't start and the system ignores every call for heating or cooling. Made to Carrier's factory specifications, this transformer outputs the correct secondary voltage and matches the original mounting pattern and terminal layout of the FC4DNF030008AAAA, eliminating the adapting and splicing that generic substitutes require. Installation is a moderate DIY task: switch off power at the disconnect, label and remove the existing leads, mount the new transformer, and reconnect each wire to its original terminal. Most people with basic electrical experience finish in under an hour, but a licensed HVAC technician is recommended for line-voltage connections. Choosing genuine Carrier protects reliability and your warranty. In stock now — orders before 3PM CST ship same day.

Compatibility

This part is compatible with Carrier model FC4DNF030008AAAA.

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 Fan Coil Model FC4DNF030008AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier Fan Coil Model FC4DNF030008AAAA. 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 Fan Coil Model FC4DNF030008AAAA?
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.
Home Shop Search Account Cart