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OEM Carrier Transformer 40VA 120V/24V for C48A902764
Carrier

OEM Carrier Transformer 40VA 120V/24V for C48A902764

SKU: CARRIE-C48A902764-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 C48A902764

This OEM step-down transformer (part number HT01BD702) is the factory-specified replacement for the Carrier C48A902764 packaged unit. The transformer converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When it fails, the entire control circuit goes dark — the thermostat becomes unresponsive, nothing calls for heating or cooling, and the system won't start at all. A blown transformer is often the cause when a system appears completely dead with no error codes.

  • Specs: 40VA rated | 120V primary / 24V secondary | Factory-matched output tolerances | Integrated thermal overload protection on select units
  • OEM vs Generic: OEM transformers like this HT01BD702 are wound and rated to Carrier's exact VA load requirements. Generic alternatives are frequently undersized, causing nuisance trips or premature burnout when the control circuit draws peak current during staging.
  • Install difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Always verify 0V at terminals before touching wiring. Photograph existing wiring connections prior to removal.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for use in the Carrier C48A902764 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering. Not sure if this part fits your system? Our HVAC parts specialists confirm fitment before you buy — contact us today 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 C48A902764?
Yes. This is the factory-specified OEM transformer for the Carrier C48A902764. 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 C48A902764?
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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