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OEM Carrier Transformer 40VA 120V/24V for C50A906064
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A906064

SKU: CARRIE-C50A906064-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 C50A906064

This is the OEM factory-specified control transformer (part number HT01BD702) for the Carrier C50A906064 commercial packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage components. When it fails, the entire control circuit goes dead — the thermostat goes blank, the system produces no response to any command, and no heating or cooling is delivered. It is often the first component to diagnose when nothing works at all.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Factory-matched for Carrier packaged unit electrical specifications
  • OEM vs Generic: OEM transformers are wound to exact VA ratings with proper thermal protection, preventing overload burnout. Generic units frequently use undersized cores that overheat and fail prematurely, especially under heavy control circuit load.
  • Install Difficulty: 2/5 — Shut off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, multimeter. Verify 0V at primary terminals before handling. Note existing wire connections or photograph wiring before disconnecting the old unit.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our HVAC parts warehouse.

Compatibility: Designed specifically for the Carrier C50A906064 commercial rooftop/packaged unit. Always verify primary voltage and VA rating on your unit's data plate before ordering to ensure correct fitment. If you have any questions about compatibility, our parts specialists are ready to confirm fit before you buy.

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 C50A906064?
Yes. This is the factory-specified OEM transformer for the Carrier C50A906064. 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 C50A906064?
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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