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OEM Carrier Transformer 40VA 120V/24V for FX4CNF018000AAAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FX4CNF018000AAAA

SKU: CARRIE-FX4CNF018000AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01CN241 for Model FX4CNF018000AAAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier FX4CNF018000AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage components. When the transformer fails, the entire control circuit goes dark — your thermostat will appear dead, the system won't respond to any calls for heating or cooling, and no error codes will appear because the board itself has lost power.

  • Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01CN241 | Direct plug-in or wire-in replacement — matches original mounting footprint and terminal configuration
  • OEM vs Generic: OEM transformers are wound to exact VA specifications for the Carrier FX4CNF018000AAAA control circuit load. Undersized or off-tolerance generic units can overheat, trip internal fuses, or fail prematurely under full accessory load (humidifier, zone board, UV light).
  • Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connector. Confirm 120V primary input is dead before touching any wiring. Verify 24V output after install before closing the cabinet.
  • Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FX4CNF018000AAAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering to ensure a correct match. Our parts specialists are available to confirm fitment — order with confidence and get your system back online fast.

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 FX4CNF018000AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FX4CNF018000AAAA. 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 FX4CNF018000AAAA?
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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