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OEM Carrier Transformer 40VA 120V/24V for FX4DNF025005ABAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FX4DNF025005ABAA

SKU: CARRIE-FX4DNF025005ABAA-TRANSFORMER-HT01CN241 Brand: Carrier

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OEM Carrier Transformer 40VA 120V/24V for Model FX4DNF025005ABAA

This OEM replacement transformer (part number HT01CN241) is the factory-specified control circuit transformer for the Carrier FX4DNF025005ABAA fan coil air handler. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, control board, and all low-voltage control components. When this transformer fails, the entire control circuit goes dark — your thermostat goes blank, nothing responds, and neither heating nor cooling can be initiated. Replacing it restores the 24V backbone that every component depends on.

  • Specs: 120V primary input | 24V secondary output | 40VA rated | OEM part number HT01CN241 | Factory-matched for Carrier FX4DNF025005ABAA fan coils
  • OEM vs Generic: This is the genuine OEM Carrier transformer manufactured to exact VA and voltage tolerances. Generic transformers often run underrated VA capacity, causing thermal overloads when multiple 24V accessories (humidifiers, zone boards, UV lights) are connected — a common cause of repeat transformer failures.
  • Install Difficulty: 2/5 — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Label all low-voltage wiring before disconnecting. Confirm 24V output with a multimeter after installation before restoring full system power.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship the same business day from our warehouse.

Compatibility: Designed and factory-matched for the Carrier FX4DNF025005ABAA fan coil air handler. Verify your unit's control circuit voltage and VA requirements on the data plate before ordering. If you are unsure about fitment, our HVAC parts specialists can confirm compatibility before you purchase — same-day shipping available on all in-stock OEM parts.

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 FX4DNF025005ABAA?
Yes. This is the factory-specified OEM transformer for the Carrier FX4DNF025005ABAA. 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 FX4DNF025005ABAA?
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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