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OEM Carrier Transformer 40VA 120V/24V for C48A602764
Carrier

OEM Carrier Transformer 40VA 120V/24V for C48A602764

SKU: CARRIE-C48A602764-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BD702 for Model C48A602764

This OEM replacement transformer (part number HT01BD702) is the factory-specified control circuit transformer for the Carrier C48A602764 packaged unit. Its sole but critical job is to step down line voltage (120V) to the 24V signal voltage that powers your thermostat, contactor coil, and control board. When this transformer fails, the entire low-voltage control circuit goes dark — the thermostat goes blank, the system stops responding to calls for heating or cooling, and nothing works. It is often the first component to check when a unit is completely unresponsive despite confirmed line voltage at the disconnect.

  • Specs: 40VA rated | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Factory-matched to Carrier C48A602764 electrical specifications
  • OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact VA and voltage tolerances. Generic transformers can run hot, sag under load, and trip thermal cutouts prematurely — causing intermittent no-start conditions that are difficult to diagnose.
  • Install difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Label or photograph all wiring connections at the primary and secondary terminals before removal. Confirm 24V output at secondary terminals after installation before reassembling the cabinet.
  • Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C48A602764 packaged unit. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. If you're unsure of fitment, our parts team is happy to confirm compatibility before you buy — just reach out before placing your order.

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 C48A602764?
Yes. This is the factory-specified OEM transformer for the Carrier C48A602764. 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 C48A602764?
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
HVAC Parts Specialist — Online