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Carrier

OEM Carrier Transformer HT01BD220 for Model FA4ANF042008AFAA

SKU: carrier-transformer-fa4anf042008afaa Brand: Carrier
$54.95

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

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OEM Carrier Transformer HT01BD220 for Model FA4ANF042008AFAA

This genuine Carrier transformer (HT01BD220) converts incoming line voltage to the 24V control voltage that runs the thermostat, relays, and control board in your FA4ANF042008AFAA fan coil air handler. When the transformer fails, the entire low-voltage circuit goes dead — you may see a blank thermostat, a system that ignores every call, or a low-voltage fuse that blows repeatedly. Manufactured to Carrier's exact OEM specifications, this transformer provides stable, correctly rated 24V output so your controls operate safely and consistently. It is a direct fit for the FA4ANF042008AFAA and mounts to the factory bracket with the existing wire connections. Installation is moderate difficulty: a knowledgeable DIYer can typically complete it in about 30 minutes, though a licensed technician is recommended for anyone uneasy working near line voltage. Always disconnect power at the breaker before wiring. Restore your control circuit with the exact part Carrier engineered. In stock and ships same-day when you order before 3PM CST.

Compatibility

This part is compatible with Carrier model FA4ANF042008AFAA.

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 FA4ANF042008AFAA?
Yes. This is the factory-specified OEM transformer for the Carrier Model FA4ANF042008AFAA. 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 FA4ANF042008AFAA?
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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