Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier Transformer 40VA 120V/24V for FB4CNF018L00ACAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FB4CNF018L00ACAA

SKU: CARRIE-FB4CNF018L00ACAA-TRANSFORMER-HT01CN241 Brand: Carrier

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01CN241 for Model FB4CNF018L00ACAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FB4CNF018L00ACAA fan coil air handler. The transformer steps down line voltage (120V) to the 24V signal voltage required to power the thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, relays won't energize, and the system produces no heating or cooling response whatsoever.

  • Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | OEM part number HT01CN241 | Designed for R-410A fan coil air handler applications
  • OEM vs Generic: This OEM unit is wound to exact factory VA and voltage specifications, ensuring stable 24V output under full control board load. Undersized or off-tolerance generic transformers can cause intermittent lockouts, nuisance tripping of the secondary fuse, and premature control board failure.
  • Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, and wire nuts. Always verify primary voltage and secondary output with a multimeter before restoring power. Document existing wiring with a photo prior to disconnecting leads.
  • Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed for the Carrier FB4CNF018L00ACAA fan coil air handler. Verify existing transformer VA rating and input/output voltages on your unit's data plate before ordering to confirm fitment. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — contact us today 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 FB4CNF018L00ACAA?
Yes. This is the factory-specified OEM transformer for the Carrier FB4CNF018L00ACAA. 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 FB4CNF018L00ACAA?
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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online