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OEM Carrier Transformer 40VA 120/24V for FX4CNF018005AAAA
Carrier

OEM Carrier Transformer 40VA 120/24V for FX4CNF018005AAAA

SKU: CARRIE-FX4CNF018005AAAA-TRANSFORMER-HT01CN241 Brand: Carrier
✓ Guaranteed to fit FX4CNF018005AAAA — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V/24V for Model FX4CNF018005AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FX4CNF018005AAAA fan coil air handler. Its job is to step down 120V line voltage to 24V AC, which powers the control board, thermostat, and all low-voltage switching circuits throughout your system. When the transformer fails, the entire control circuit goes dark — your thermostat will be unresponsive, your air handler will not start, and no heating or cooling calls will be processed. A failed transformer is often the first thing to suspect when absolutely nothing responds.

  • Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM Part Number: HT01CN241 | Factory-matched output tolerance for reliable low-voltage operation
  • OEM vs Generic: This is the factory OEM unit — built to exact VA rating and insulation class required by Carrier. Generic transformers often underrate their VA capacity, leading to overheating under normal HVAC control loads and premature failure.
  • Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always confirm primary and secondary wiring connections match original routing before restoring power.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FX4CNF018005AAAA fan coil air handler. Verify your existing transformer's VA rating and voltage specs on the unit data plate before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system back online 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 $99
  • 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 FX4CNF018005AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FX4CNF018005AAAA. 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 FX4CNF018005AAAA?
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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