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OEM Carrier Transformer 40VA 120V-24V for FX4CNF036000AAAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FX4CNF036000AAAA

SKU: CARRIE-FX4CNF036000AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01CN241 for Model FX4CNF036000AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FX4CNF036000AAAA fan coil air handler. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: your thermostat becomes unresponsive, the system refuses to start, and no fault codes are generated because the board itself has no power.

  • Specs: Input: 120V AC | Output: 24V AC | Rating: 40VA | OEM Part Number: HT01CN241 | Factory-matched impedance and insulation class for safe, reliable operation
  • OEM vs Generic: OEM transformers are wound to exact factory VA ratings and insulation standards. Undersized or off-tolerance generic units can overheat, trip thermal cutoffs prematurely, or fail to supply adequate current to the contactor coil — causing intermittent no-start faults that are notoriously difficult to diagnose.
  • Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 24V output after install), wire stripper. Always label low-voltage wiring connections before removal and confirm primary fusing is intact on the 24V secondary side.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FX4CNF036000AAAA fan coil air handler. Verify your existing transformer's input voltage (120V), output voltage (24V), and VA rating (40VA) against your unit's data plate before ordering. If your thermostat is completely unresponsive and your breaker is not tripped, this transformer is the most likely culprit. Our parts team is available to confirm fitment before you buy — order now and receive same-day shipping on in-stock units.

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 FX4CNF036000AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FX4CNF036000AAAA. 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 FX4CNF036000AAAA?
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
HVAC Parts Specialist — Online