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OEM Carrier Transformer 40VA 120V/24V for FB4CNP025L00AAAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FB4CNP025L00AAAA

SKU: CARRIE-FB4CNP025L00AAAA-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 FB4CNP025L00AAAA

This OEM control circuit transformer (part number HT01CN241) is the factory-specified replacement for the Carrier FB4CNP025L00AAAA 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 the transformer fails, the entire control system goes dark: the 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 one of the most important components to verify early in any diagnostic.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched output voltage and VA capacity
  • OEM vs Generic: OEM transformers are wound to exact VA tolerances, protecting downstream components like contactors and control boards from voltage fluctuation. Generic units with undersized VA ratings can overheat and fail prematurely, potentially damaging connected controls.
  • Install difficulty: 2/5 — Shut off power at the breaker and verify with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wires before disconnecting and confirm polarity on the secondary terminals.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FB4CNP025L00AAAA fan coil air handler. Verify your unit's data plate shows 120V primary input and 24V secondary output before ordering. Our fitment specialists are available to 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 FB4CNP025L00AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FB4CNP025L00AAAA. 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 FB4CNP025L00AAAA?
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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