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Carrier

OEM Carrier Transformer HT01BD223 for Model FA4CNC042008AAAA

SKU: carrier-transformer-fa4cnc042008aaaa Brand: Carrier
$44.95

Order before 3PM CST — ships same day.
Standard delivery 2-5 business days. Express options at checkout.

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OEM Carrier Transformer HT01BD223 for Model FA4CNC042008AAAA

Bring control power back to your Carrier FA4CNC042008AAAA with this genuine OEM transformer (HT01BD223). The transformer converts incoming line voltage down to the 24V required to operate your thermostat, control board, contactor, and relays. A burned-out transformer leaves the system totally dead — no thermostat display, no fan, no cooling call. This authentic Carrier replacement matches the original's primary and secondary voltage and VA ratings exactly, ensuring a correct electrical and mechanical fit on the FA4CNC042008AAAA fan coil. Using the proper OEM transformer keeps your entire 24V control circuit stable and shields the control board from voltage-related damage. Installation is rated moderate: an experienced DIYer or technician can complete the swap in roughly 30 minutes by matching the lead wires and mounting bracket, always with power disconnected at the breaker. This is a brand-new genuine Carrier part, not a generic equivalent that may under-deliver VA. Order before 3PM CST and it ships the same day, getting your HVAC system back in service quickly. Our parts team is available to confirm fit before you buy.

Compatibility

This part is compatible with Carrier model FA4CNC042008AAAA.

Shipping

Same-day shipping before 3 PM CST. 30-day returns on uninstalled 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 support@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Transformer fit my Carrier Model FA4CNC042008AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier Model FA4CNC042008AAAA. 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 Model FA4CNC042008AAAA?
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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