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OEM Carrier Transformer 40VA 120V-24V for FY5BNF036T10AAAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FY5BNF036T10AAAA

SKU: CARRIE-FY5BNF036T10AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V–24V for Model FY5BNF036T10AAAA

This OEM Carrier transformer (part number HT01CN241) is the factory-specified replacement for the FY5BNF036T10AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V signal voltage required by the control board, thermostat, and all low-voltage components in the system. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no low-voltage components receive power. It is one of the first components to check when nothing in the system responds.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN241 | Factory-matched impedance and VA capacity for the FY5BNF036T10AAAA control circuit
  • OEM vs Generic: This factory OEM transformer is wound to the exact VA rating and insulation class specified by Carrier. Undersized or off-tolerance aftermarket transformers can overheat, trip internal fuses, or deliver insufficient current to the control board — causing nuisance lockouts and premature component failure.
  • Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wiring connections before disconnecting. Confirm incoming voltage is 120V at the primary leads before energizing.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model FY5BNF036T10AAAA fan coil units. Verify your existing transformer's primary voltage (120V) and VA rating (40VA) on the unit data plate or existing component label before ordering. Our parts specialists are available to confirm fitment — contact us before you order if you have any questions.

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 FY5BNF036T10AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FY5BNF036T10AAAA. 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 FY5BNF036T10AAAA?
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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