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OEM Carrier Transformer 40VA 120V/24V for FV4BNF002T00AAAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FV4BNF002T00AAAA

SKU: CARRIE-FV4BNF002T00AAAA-TRANSFORMER-HT01CN236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V to 24V for Model FV4BNF002T00AAAA

This OEM replacement transformer (part number HT01CN236) is the factory-specified control circuit transformer for the Carrier FV4BNF002T00AAAA fan coil air handler. The transformer steps down line voltage from 120V to the 24V signal required by your thermostat, control board, and all low-voltage safety circuits. When this part fails, the entire control circuit loses power — the thermostat goes dark, the system refuses to respond to any calls for heating or cooling, and no error codes are displayed because there is no power to generate them.

  • Specs: Input: 120V AC | Output: 24V AC | Rating: 40VA | OEM Part Number: HT01CN236 | Factory-matched construction for Carrier fan coil applications
  • OEM vs Generic: This OEM transformer is wound to exact Carrier factory specifications, ensuring stable 24V output under full VA load. Generic transformers frequently underperform at rated VA, causing intermittent lockouts, nuisance tripping of the 3-amp fuse, or premature failure of downstream control boards.
  • Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Note wire colors and terminal labels before disconnecting the old unit. Confirm 24V output with a multimeter before buttoning up the panel.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before 3 PM ship the same business day from our stocked warehouse.

Compatibility: Designed for the Carrier FV4BNF002T00AAAA fan coil air handler. Verify your existing transformer's input/output voltage and VA rating against your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — same-day shipping on all in-stock OEM 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 FV4BNF002T00AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FV4BNF002T00AAAA. 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 FV4BNF002T00AAAA?
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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