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OEM Carrier Transformer 40VA 24V for FC4DNF018005AAAA — HT01CN241
Carrier

OEM Carrier Transformer 40VA 24V for FC4DNF018005AAAA — HT01CN241

SKU: CARRIE-FC4DNF018005AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer for Model FC4DNF018005AAAA (Part# HT01CN241)

This OEM replacement transformer is the factory-specified unit for the Carrier FC4DNF018005AAAA fan coil. The transformer steps down 120V line voltage to the 24V signal that powers your control board, thermostat, and all low-voltage switching circuits. When it fails, the entire control circuit goes dark — your thermostat goes blank, the system becomes completely unresponsive, and no heating or cooling function can be initiated. Replacing it with the correct OEM part (HT01CN241) restores proper voltage output and protects downstream components from voltage irregularities.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM Part# HT01CN241 | Factory-matched output for Carrier low-voltage control circuits
  • OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and winding tolerances. Undersized or off-brand transformers can sag under load, causing erratic thermostat behavior, nuisance lockouts, and premature control board failure.
  • Install difficulty: 2/5 — Shut off power at the breaker and disconnect block before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after install. Photograph all wiring connections before removal.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FC4DNF018005AAAA fan coil unit. Always verify your unit's data plate voltage requirements and VA rating before ordering. Our team is available to confirm fitment prior to purchase — don't guess on a control circuit component.

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 FC4DNF018005AAAA — HT01CN241?
Yes. This is the factory-specified OEM transformer for the Carrier FC4DNF018005AAAA — HT01CN241. 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 FC4DNF018005AAAA — HT01CN241?
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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