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OEM Carrier Transformer 40VA 120V-24V for FY4ANF018T00AAAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FY4ANF018T00AAAA

SKU: CARRIE-FY4ANF018T00AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V–24V for Model FY4ANF018T00AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FY4ANF018T00AAAA fan coil unit. The transformer steps down line voltage (120V) to the 24V control voltage that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — your thermostat shows no response, the system won't call for heating or cooling, and nothing operates despite power being present at the unit. It is often the first component to check when a system is completely unresponsive.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN241 | Factory-matched for Carrier FY4ANF018T00AAAA fan coil units
  • OEM vs Generic: This OEM unit is wound to exact factory VA and voltage tolerances, ensuring stable 24V output under full control circuit load. Undersized or off-tolerance generic transformers can cause erratic thermostat behavior, nuisance tripping, or premature control board failure.
  • Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wiring connections before removal. Verify 24V output with a multimeter after installation before closing the unit.
  • Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier FY4ANF018T00AAAA fan coil unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering to ensure a proper fit. Have questions about compatibility? Our HVAC parts specialists verify fitment 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 FY4ANF018T00AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FY4ANF018T00AAAA. 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 FY4ANF018T00AAAA?
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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