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 for Model FA4...

IMAGE COMING SOON

Carrier

OEM Carrier Transformer for Model FA4BNF042008AAAA Fan Coil Unit

SKU: carrier-transformer-fa4bnf042008aaaa Brand: Carrier
$39.95

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 for Model FA4BNF042008AAAA Fan Coil Unit

This genuine OEM Carrier transformer is the exact replacement for the FA4BNF042008AAAA fan coil unit. The transformer steps line voltage down to the 24V control power that operates your thermostat, control board, and relay circuits. A failed transformer leaves the low-voltage circuit dead, and the system stops responding to thermostat demand. Fitting the correct factory-spec transformer restores stable 24V output and protects the control components from voltage irregularities. This part is a direct fit for the Carrier FA4BNF042008AAAA, mounting in the original location with matching primary and secondary leads. Installation is moderate and best performed by a qualified HVAC technician: disconnect power, record the wiring, install the new transformer, and confirm 24V on the secondary with a meter. Genuine OEM ensures the proper VA rating and durable, long-term reliability over generic parts. In stock and ready to ship. Orders placed before 3PM CST ship same-day so your system is restored quickly.

Compatibility

This part is compatible with Carrier model FA4BNF042008AAAA.

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 FA4BNF042008AAAA Fan Coil Unit?
Yes. This is the factory-specified OEM transformer for the Carrier Model FA4BNF042008AAAA 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 FA4BNF042008AAAA 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.
Home Shop Search Account Cart