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OEM Carrier Transformer 40VA 120V/24V for C50A203564
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A203564

SKU: CARRIE-C50A203564-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BD702 for Model C50A203564

This OEM replacement transformer (part number HT01BD702) is the factory-specified control circuit transformer for the Carrier C50A203564 commercial packaged unit. Its job is to step down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this transformer fails, absolutely nothing in the control circuit responds — the thermostat goes dark, the contactor won't pull in, and the unit sits completely unresponsive even though line voltage is present at the unit.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V AC | OEM part number HT01BD702 | Factory-wound core for stable output under full load
  • OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA and thermal specifications. Undersized or off-tolerance generic transformers can sag under load, cause erratic board behavior, or fail prematurely from thermal stress — making OEM the only reliable choice for a commercial unit.
  • Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or push-in connectors, multimeter to verify 24V output after installation. Label all wires before disconnecting the old unit and confirm polarity on the secondary side.
  • Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C50A203564 commercial rooftop/packaged unit. Always verify the VA rating and primary/secondary voltages on your existing transformer's data label before ordering to confirm an exact match. Our parts specialists are available to verify fitment — contact us before you order if you have any questions. 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 C50A203564?
Yes. This is the factory-specified OEM transformer for the Carrier C50A203564. 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 C50A203564?
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