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OEM Carrier Transformer 40VA 120V-24V for FY4ANF018008AAAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FY4ANF018008AAAA

SKU: CARRIE-FY4ANF018008AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V/24V for Model FY4ANF018008AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified step-down transformer for the Carrier FY4ANF018008AAAA fan coil unit. The transformer converts 120V line voltage down to the 24V AC signal that powers the entire control circuit — including the thermostat, control board, and all low-voltage relays. When the transformer fails, the entire system goes silent: the thermostat goes blank, no calls for heating or cooling are answered, and the unit will not respond to any commands. A failed transformer is often misdiagnosed as a control board failure, making this an essential first diagnostic step.

  • Specs: 40VA rating | 120V primary input | 24V secondary output | OEM part number HT01CN241 | Factory-matched terminals for direct plug-in replacement
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control circuitry. Undersized or off-tolerance generic transformers can cause nuisance tripping, brownout conditions on the 24V circuit, and premature control board failure.
  • Install difficulty: 2/5 — Shut off all power to the unit at the disconnect and breaker before beginning work. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label or photograph all low-voltage wiring connections before disconnecting. Verify 24V output with a multimeter after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FY4ANF018008AAAA fan coil unit. Always confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us any time.

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 FY4ANF018008AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FY4ANF018008AAAA. 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 FY4ANF018008AAAA?
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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