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OEM Carrier 40VA 120V to 24V Control Transformer for C48A206064 | National HVAC Parts
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C48A206064 | National HVAC Parts

SKU: CARRIE-C48A206064-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BD702 for Model C48A206064

This is the factory OEM replacement transformer (part number HT01BD702) for the Carrier C48A206064 packaged unit. The control transformer is the heartbeat of your system's low-voltage circuit — it steps down 120V line voltage to the 24V signal voltage that powers your thermostat, contactor coil, and control board. When this transformer fails, nothing works: the thermostat goes dark, the system won't respond to any call for heating or cooling, and you may detect a burnt smell near the control panel. It is often the first component to inspect when diagnosing a completely unresponsive unit.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Factory-matched impedance and thermal protection
  • OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and insulation class. Generic transformers frequently undersell VA capacity, causing overheating and premature failure — especially under high-demand loads from multiple control accessories.
  • Install Difficulty: 2/5 — Shut off all power to the unit at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wire connections before removal. Verify 24V output with a multimeter after installation before closing the panel.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier C48A206064 packaged unit. Always verify your existing transformer's VA rating, primary voltage, and secondary voltage on the unit's data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence and get your system back online fast.

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 C48A206064 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C48A206064 | National HVAC Parts. 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 C48A206064 | National HVAC Parts?
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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