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OEM Carrier Transformer 40VA 120V-24V for FB4CNP018L08ACAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FB4CNP018L08ACAA

SKU: CARRIE-FB4CNP018L08ACAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01CN241 for Model FB4CNP018L08ACAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier FB4CNP018L08ACAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the entire control system goes dark: your thermostat loses power, the system stops responding to calls for heating or cooling, and nothing works. A failed transformer is often misdiagnosed as a bad thermostat or control board, making it a critical first diagnostic check.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01CN241 | Factory-matched output for reliable low-voltage circuit performance
  • OEM vs Generic: OEM transformers are wound and rated to exact factory VA specifications, ensuring stable 24V output under full control circuit load. Generic units often run under-rated VA, causing voltage sag that triggers nuisance lockouts and premature contactor coil failure.
  • Install difficulty: 2/5 — Shut off all power to the air handler before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring connections before disconnecting. Confirm input and output voltages with a multimeter after installation.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier FB4CNP018L08ACAA fan coil air handler. Verify the transformer's VA rating and voltage on your unit's data plate before ordering to confirm fitment. Our team is available to verify compatibility before you purchase — same-day shipping available on all in-stock orders.

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 FB4CNP018L08ACAA?
Yes. This is the factory-specified OEM transformer for the Carrier FB4CNP018L08ACAA. 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 FB4CNP018L08ACAA?
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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