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OEM Carrier Transformer 40VA 120V/24V for FB4BNF048015AAAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FB4BNF048015AAAA

SKU: CARRIE-FB4BNF048015AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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OEM Carrier Control Transformer 40VA 120V/24V for Model FB4BNF048015AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FB4BNF048015AAAA fan coil air handler. The transformer steps down line voltage from 120V to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuit components. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system stops responding completely, and no heating or cooling can be initiated regardless of demand.

  • Specs: 40VA rating | Primary voltage: 120V AC | Secondary voltage: 24V AC | OEM part number HT01CN241 | Factory-matched for Carrier FB4BNF048015AAAA fan coil units
  • OEM vs Generic: This OEM transformer is wound to exact Carrier factory specifications, ensuring correct VA capacity and voltage regulation. Undersized or off-tolerance generic transformers can overload and fail prematurely, or cause erratic low-voltage control behavior that mimics other faults.
  • Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Label all low-voltage wiring connections before disconnecting. Verify 24V output with a multimeter after installation and before powering the full system.
  • Warranty: 1-year OEM factory warranty against defects. In-stock units ship same business day when ordered before cutoff.

Compatibility: Designed specifically for the Carrier FB4BNF048015AAAA fan coil air handler. Always confirm the existing transformer's VA rating and primary/secondary voltages on your unit's wiring diagram or data plate before ordering. Our HVAC parts specialists are available to verify fitment — contact us before you order if you have any questions. In stock and ready to ship today.

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 FB4BNF048015AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FB4BNF048015AAAA. 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 FB4BNF048015AAAA?
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
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