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OEM Carrier Transformer 40VA 120V-24V for FB4BNF036015AAAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FB4BNF036015AAAA

SKU: CARRIE-FB4BNF036015AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer for Model FB4BNF036015AAAA

This is the factory OEM replacement control transformer (part# HT01CN241) for the Carrier FB4BNF036015AAAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, the entire control system goes dark: the thermostat shows no power, the system will not respond to any calls for heating or cooling, and you may detect a burning smell or a tripped fuse on the control board.

  • Specs: 40VA rated | 120V primary / 24V secondary | Single-phase | Factory-matched OEM part number HT01CN241 | Replaces original transformer to exact electrical specification
  • OEM vs Generic: OEM transformers use factory-grade copper windings and meet exact VA ratings. Undersized or off-brand units can overheat under load, blow the 3A control fuse repeatedly, and shorten the life of your control board.
  • Install difficulty: 2/5 — Shut off all power to the air handler before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm incoming voltage is 0V before touching terminals. Photograph all wiring connections before disconnecting the old transformer.
  • Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier FB4BNF036015AAAA fan coil air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy — same-day shipping available on all stocked 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 info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Transformer fit my Carrier FB4BNF036015AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FB4BNF036015AAAA. 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 FB4BNF036015AAAA?
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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