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OEM Carrier Transformer 40VA 120V/24V for C48A802764
Carrier

OEM Carrier Transformer 40VA 120V/24V for C48A802764

SKU: CARRIE-C48A802764-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 C48A802764

This OEM step-down transformer (part number HT01BD702) is the factory-specified replacement for the Carrier C48A802764 packaged unit. The transformer converts 120V line voltage down to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any call for heating or cooling, and nothing turns on. It is often the first component to check when all other components appear intact but the system is completely unresponsive.

  • Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01BD702 | Factory-matched output voltage for reliable low-voltage circuit operation
  • OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage tolerances. Generic transformers frequently deliver inconsistent 24V output, causing nuisance lockouts, contactor chatter, and premature control board failure.
  • Install Difficulty: 2/5 — Shut off power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 0V at primary terminals before handling. Photograph all wiring connections prior to removal and match wire-for-wire on reinstall.
  • Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier C48A802764 packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering. If you are unsure of fitment, our HVAC parts specialists are available to verify compatibility before you purchase. Order today — in stock and ships same business day.

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 C48A802764?
Yes. This is the factory-specified OEM transformer for the Carrier C48A802764. 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 C48A802764?
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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