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 FA4BNF048000AAAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FA4BNF048000AAAA

SKU: CARRIE-FA4BNF048000AAAA-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 Transformer 40VA 120V to 24V for Model FA4BNF048000AAAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FA4BNF048000AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V signal voltage required to power the control board, thermostat, and all low-voltage control circuits. When this component fails, the entire control system goes dark — the thermostat loses power, the system refuses to respond to any commands, and no heating or cooling operation is possible. A failed transformer is often misdiagnosed as a bad control board, so always test this component first before replacing more expensive parts.

  • Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01CN241 | Factory-matched windings and core rating
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage tolerance specifications. Generic alternatives frequently run under-rated VA, causing nuisance trips and premature failure when multiple control accessories draw simultaneous load.
  • Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Note wire colors and terminal positions before disconnecting leads. Confirm 24V output with a multimeter after installation before closing the panel.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FA4BNF048000AAAA fan coil air handler. Verify your unit's data plate shows 120V primary control voltage before ordering. If you are unsure of fitment, our HVAC parts specialists can confirm compatibility before you purchase — no guesswork required. Order today for same-day shipping.

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 FA4BNF048000AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FA4BNF048000AAAA. 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 FA4BNF048000AAAA?
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