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OEM Carrier Transformer 40VA 120V/24V for FV4CNB005T00AAAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FV4CNB005T00AAAA

SKU: CARRIE-FV4CNB005T00AAAA-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 FV4CNB005T00AAAA

This is the OEM factory-replacement transformer (part number HT01CN236) for the Carrier FV4CNB005T00AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V signal voltage required to power the control board, thermostat, and all low-voltage switching circuits. When it fails, the entire control circuit goes dark — your thermostat becomes unresponsive, the system refuses to start, and no fault codes appear because there is no power to generate them. Replacing a failed transformer is one of the most cost-effective repairs in HVAC service.

  • Specs: 40VA rating | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01CN236 | Factory-matched output voltage and VA capacity
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier FV4CNB005T00AAAA control board. Under-rated or off-tolerance generic transformers can overheat, trip internal thermal protection, or damage downstream control components over time.
  • Install difficulty: 2/5 — Always shut off power at the breaker and disconnect the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm 0V at primary terminals before touching wiring. Document or photograph all wire connections before removal.
  • Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier FV4CNB005T00AAAA fan coil air handler. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating on the unit data plate or existing component label before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system running 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 FV4CNB005T00AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FV4CNB005T00AAAA. 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 FV4CNB005T00AAAA?
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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