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OEM Carrier Transformer FA4BNF036005AAAA for Model FA4BNF036005AAAA

SKU: carrier-transformer-fa4bnf036005aaaa 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 FA4BNF036005AAAA for Model FA4BNF036005AAAA

This OEM Carrier transformer is a direct-fit replacement for your FA4BNF036005AAAA fan coil unit. The transformer steps down incoming line voltage to the low-voltage control circuit that powers your thermostat, contactor coil, and control board. When a transformer fails, the system goes completely dead at the thermostat even though line power is present. This genuine Carrier component is built to factory specifications for the exact VA rating and primary/secondary voltage your FA4BNF036005AAAA requires, ensuring reliable operation and protecting downstream controls. Installation is a moderate DIY job for anyone comfortable working around 24V and line-voltage wiring: cut power at the disconnect, label and transfer leads, and mount in the original location. Most homeowners with basic electrical knowledge complete it in under 30 minutes, though we recommend a licensed technician if you are unsure. All orders placed before 3PM CST ship the same day so you can get your system back online fast. Backed by genuine OEM quality you can trust for long-term performance.

Compatibility

This part is compatible with Carrier model FA4BNF036005AAAA.

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 FA4BNF036005AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier Model FA4BNF036005AAAA. 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 FA4BNF036005AAAA?
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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