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OEM Carrier Transformer 40VA 120V/24V for FC4DNF018008AAAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FC4DNF018008AAAA

SKU: CARRIE-FC4DNF018008AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V/24V for Model FC4DNF018008AAAA

This OEM replacement transformer (part# HT01CN241) is the factory-specified control circuit transformer for the Carrier FC4DNF018008AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the control board, thermostat, and all low-voltage switching components. When this transformer fails, the entire control circuit goes dark — your thermostat will be unresponsive, the system won't call for heating or cooling, and nothing will happen when you adjust the setpoint. It is one of the first components to check when a unit appears completely dead despite confirmed line voltage at the unit.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-wound coil with thermal overload protection
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances specified by Carrier's engineering team. Undersized or off-tolerance aftermarket units can sag under load, causing nuisance lockouts, control board damage, or premature contactor failure downstream.
  • Install difficulty: 2/5 — Disconnect all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Test secondary output (should read 24–28V AC) before condemning the transformer. Label or photograph all low-voltage wiring connections prior to removal.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our stocked warehouse.

Compatibility: Designed and factory-matched for the Carrier FC4DNF018008AAAA fan coil unit. Verify OEM part number HT01CN241 against your unit's wiring diagram or data plate before ordering. Our parts specialists are available to confirm fitment — order with confidence and get back up and 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 FC4DNF018008AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FC4DNF018008AAAA. 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 FC4DNF018008AAAA?
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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