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OEM Carrier Transformer 40VA 120V-24V for FB4BNF048008AAAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FB4BNF048008AAAA

SKU: CARRIE-FB4BNF048008AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V to 24V for Model FB4BNF048008AAAA

This is the OEM factory-replacement transformer (part number HT01CN241) for the Carrier FB4BNF048008AAAA fan coil air handler. The transformer steps down line voltage from 120V AC to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the entire control system loses power: the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no components will energize. A blown transformer is often caused by a short in the low-voltage wiring or a failed control board drawing excess current — always inspect the secondary circuit before installing a replacement.

  • Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01CN241 | Factory-matched for Carrier FB4BNF048008AAAA air handlers
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class, ensuring reliable 24V output under full control-circuit load. Generic transformers frequently under-deliver on VA rating, causing voltage sag, nuisance lockouts, and premature failure of downstream components.
  • Install Difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output after installation before closing the unit. Note any blown low-voltage fuses and trace the short before powering up.
  • Warranty: 1-year OEM factory warranty against defects. In-stock and ships the same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier FB4BNF048008AAAA fan coil air handlers. Confirm input voltage and VA rating on your unit's data plate before ordering. Need help verifying fitment? Our HVAC parts specialists confirm compatibility before your order ships — same-day if ordered before 3 PM.

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 info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Transformer fit my Carrier FB4BNF048008AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FB4BNF048008AAAA. 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 FB4BNF048008AAAA?
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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Mike Rivera
HVAC Parts Specialist — Online