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OEM Carrier Transformer 40VA 120V/24V for C50A805064
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A805064

SKU: CARRIE-C50A805064-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V/24V for Model C50A805064

This OEM replacement transformer (part number HT01BD702) is the factory-specified control circuit transformer for the Carrier C50A805064 commercial packaged unit. The transformer steps down 120V line voltage to 24V AC to power the control board, thermostat, and all low-voltage switching components. When this transformer fails, the entire control circuit loses power — nothing works. Symptoms include a completely unresponsive thermostat, no contactor pull-in, and no blower or burner activity despite line voltage being present at the unit.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD702 | Factory-matched for Carrier C50A805064 packaged systems
  • OEM vs Generic: This OEM transformer is wound to exact VA and voltage specifications for the C50A805064 control circuit. Generic transformers may be under-rated in VA, causing thermal overload trips under normal load and shortening system life.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output after install before restoring system power. Always confirm primary voltage matches your supply before connecting.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier C50A805064 commercial rooftop/packaged unit. Verify VA rating and primary/secondary voltages on your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — order with confidence and get same-day shipping on in-stock OEM parts.

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 C50A805064?
Yes. This is the factory-specified OEM transformer for the Carrier C50A805064. 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 C50A805064?
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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