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OEM Carrier Transformer 40VA 120V-24V for FA4CNC018008AAAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FA4CNC018008AAAA

SKU: CARRIE-FA4CNC018008AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V to 24V for Model FA4CNC018008AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FA4CNC018008AAAA air handler. The transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, absolutely nothing responds: the thermostat goes blank, the system won't call for heating or cooling, and no blower or fan operation occurs. A failed transformer is often mistaken for a bad thermostat or control board, making it one of the most commonly misdiagnosed components in the system.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN241 | Factory-matched to FA4CNC018008AAAA control circuit requirements
  • OEM vs Generic: This OEM transformer is wound and rated to exact factory specifications. Generic alternatives often use thinner windings and lower-grade cores, increasing the risk of overheating, voltage sag under load, and premature failure — especially when multiple accessories share the 24V circuit.
  • Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wiring connections before removal. Verify 24V output with a multimeter after installation and before restoring full system power.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed by 3 PM local time ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FA4CNC018008AAAA air handler. If your unit's data plate confirms a 40VA 120V/24V transformer requirement and OEM part number HT01CN241, this is a direct drop-in replacement. Have your model and serial number ready when ordering — our fitment team is available to confirm compatibility before you buy. In stock and ships 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 FA4CNC018008AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FA4CNC018008AAAA. 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 FA4CNC018008AAAA?
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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