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OEM Carrier 40VA 120V to 24V Control Transformer for C48A202764 — Ships Today
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C48A202764 — Ships Today

SKU: CARRIE-C48A202764-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 C48A202764

This OEM control transformer (part number HT01BD702) is the factory-specified replacement for the Carrier C48A202764 packaged unit. The transformer steps line voltage (120V) down to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When the transformer fails, the entire control circuit goes dark — no thermostat response, no contactor pull-in, and no heating or cooling whatsoever. A blown fuse on the secondary side or a visibly burnt transformer body are the most common signs of failure.

  • Specs: 40VA rated | Primary: 120V | Secondary: 24V | Class 2 insulation | Chassis-mount design | OEM part number HT01BD702
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class. Generic replacements frequently use undersized windings that overheat under full control-circuit load, causing repeated blown fuses and premature failure.
  • Install difficulty: 2/5 — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Label or photograph all low-voltage wiring connections before removal.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before 3 PM ET ship the same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier C48A202764 packaged unit. Verify primary voltage and VA rating on your unit's data plate before ordering. If your existing transformer shows a different VA rating or dual-primary wiring (120V/240V), contact our parts team — we verify fitment before you buy so there are no surprises. In stock and ready to ship today.

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 C48A202764 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C48A202764 — Ships Today. 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 C48A202764 — Ships Today?
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