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OEM Carrier Transformer 40VA 120V/24V for FY5BNF048T10AAAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FY5BNF048T10AAAA

SKU: CARRIE-FY5BNF048T10AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01CN241 for Model FY5BNF048T10AAAA

This OEM Carrier control transformer (part number HT01CN241) is the factory-specified replacement for the FY5BNF048T10AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V DC signal required by the thermostat, control board, and all low-voltage control circuits. When it fails, the entire control circuit goes dark — the thermostat loses power, the system won't respond to any commands, and in some cases the secondary fuse will blow repeatedly if a short downstream is present.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01CN241 | Factory-matched output tolerance for reliable low-voltage control
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class. Generic substitutes often underrate their VA capacity, causing overheating and premature failure when multiple 24V accessories (humidifiers, zoning boards) are on the circuit.
  • Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to verify 24V output after installation. Always label or photograph wiring connections before disconnecting the old transformer.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FY5BNF048T10AAAA fan coil unit. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating on the unit's data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy.

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 FY5BNF048T10AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FY5BNF048T10AAAA. 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 FY5BNF048T10AAAA?
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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