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OEM Carrier Transformer 40VA 120V/24V for FX4CNF024005AAAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FX4CNF024005AAAA

SKU: CARRIE-FX4CNF024005AAAA-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 FX4CNF024005AAAA

This is the factory-specified OEM replacement transformer (part# HT01CN241) for the Carrier FX4CNF024005AAAA fan coil unit. The control transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, control board, and zone components. When this transformer fails, absolutely nothing in the control circuit responds: the thermostat goes blank, the system refuses to call for heating or cooling, and no error codes are generated because the board itself has no power.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched for Carrier FX4CNF024005AAAA fan coil
  • OEM vs Generic: OEM transformers are wound and rated to exact factory VA specifications, ensuring proper current capacity for all connected low-voltage loads. Undersized generic units can overheat, trip internal fuses, or fail prematurely when multiple accessories are wired on the 24V circuit.
  • Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 0V before touching terminals). Photograph all wire connections before disconnecting. Reconnect matching color or label codes exactly.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed by 3PM local time ship same business day from our stocked warehouse.

Compatibility: Designed specifically for the Carrier FX4CNF024005AAAA fan coil unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If your system has added accessories (humidifier, UV light, communicating thermostat), confirm total 24V load does not exceed 40VA. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you order — reach out before you buy.

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 FX4CNF024005AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FX4CNF024005AAAA. 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 FX4CNF024005AAAA?
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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