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OEM Carrier Transformer 40VA 230/115V for Model 09DE054100
Carrier

OEM Carrier Transformer 40VA 230/115V for Model 09DE054100

SKU: CARRIE-09DE054100-TRANSFORMER-HT01BC208 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BC208 for Model 09DE054100

This OEM Carrier control transformer (part number HT01BC208) is the factory-specified replacement for the Carrier 09DE054100. The transformer steps down line voltage to power the low-voltage control circuit that coordinates your system's thermostat, contactor, and safety controls. When this transformer fails, the entire control circuit goes dead — your thermostat will display no power, the system won't respond to any calls for heating or cooling, and there may be a blown fuse or tripped breaker on the secondary side.

  • Specs: 40VA | 230V primary / 115V secondary | 50/60 Hz | OEM part number HT01BC208 | Cross-reference: 320659-301, 2-05757-1
  • OEM vs Generic: This is a genuine Totaline/Carrier OEM transformer wound to exact factory VA and voltage tolerances. Aftermarket units may underperform under peak load, causing nuisance trips or premature burnout of secondary fusing.
  • Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wires before removing the old unit. Verify primary and secondary voltages with a multimeter before energizing.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier 09DE054100. Also fits select Bryant and Payne models sharing the same 230V/115V 40VA transformer specification — verify your unit's data plate voltage and VA rating before ordering. Our team is available to confirm fitment before you purchase.

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 Model 09DE054100?
Yes. This is the factory-specified OEM transformer for the Carrier Model 09DE054100. 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 09DE054100?
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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