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OEM Carrier Transformer 40VA 120V/24V for C50A803064
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A803064

SKU: CARRIE-C50A803064-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BD702 for Model C50A803064

This OEM control transformer (part number HT01BD702) is the factory-specified replacement for the Carrier C50A803064 commercial packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, contactor coil, and all low-voltage control circuits. When it fails, the entire control system goes dark — the thermostat loses power, the unit will not respond to any call for heating or cooling, and no safety or staging functions will operate. A failed transformer is often misdiagnosed as a thermostat or control board issue, making this an essential first-check component.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Factory-matched output tolerance for reliable low-voltage control
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications for the C50A803064 control circuit. Undersized or off-tolerance generic units can overheat, trip internal thermal protection, or fail to sustain voltage under full control-circuit load.
  • Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before handling. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminal connectors, multimeter. Label all low-voltage wiring before removal to ensure correct reinstallation.
  • Warranty: 1-year OEM factory warranty. Orders placed by 3PM ship same business day from our warehouse.

Compatibility: Designed for the Carrier C50A803064 commercial rooftop/packaged unit. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. If your application involves a 208/240V primary, do not substitute — contact our parts team for the correct transformer. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — no guesswork.

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 C50A803064?
Yes. This is the factory-specified OEM transformer for the Carrier C50A803064. 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 C50A803064?
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