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OEM Carrier Transformer 40VA 120V-24V for FA4CNC042010AAAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FA4CNC042010AAAA

SKU: CARRIE-FA4CNC042010AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V to 24V for Model FA4CNC042010AAAA

This is the factory OEM replacement transformer (part# HT01CN241) for the Carrier FA4CNC042010AAAA fan coil air handler. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: your thermostat goes blank, the system won't respond to any calls for heating or cooling, and in some cases you may notice a burning smell or a tripped low-voltage fuse. It is one of the most overlooked yet critical components in the system.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM Part Number: HT01CN241 | Factory-matched output for stable control voltage
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-spec generic units can cause nuisance tripping, control board damage, or erratic thermostat behavior — making OEM the only recommended choice for this application.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to verify 24V output after installation. Always confirm correct wiring polarity and check for shorted low-voltage wiring before replacing the transformer.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier FA4CNC042010AAAA fan coil air handler. Verify part number HT01CN241 against your unit's data plate or existing transformer label before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy. Order now 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 FA4CNC042010AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FA4CNC042010AAAA. 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 FA4CNC042010AAAA?
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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