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OEM Carrier Transformer 40VA 120V/24V for C50A506064
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A506064

SKU: CARRIE-C50A506064-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer for Model C50A506064

This OEM Carrier transformer (part number HT01BD702) is the factory-specified replacement for the C50A506064 commercial packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this part fails, the entire control circuit goes dead — the thermostat loses power, the contactor won't energize, and the unit refuses to start in any mode. If your system appears completely unresponsive despite confirmed line voltage, a failed transformer is one of the first components to test.

  • Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Mounts to standard control board bracket
  • OEM vs Generic: The OEM HT01BD702 is wound to Carrier's exact VA and voltage tolerance specs. Generic transformers can sag under full load, causing intermittent lockouts, nuisance tripping, or premature contactor coil failure — OEM is the reliable choice.
  • Install difficulty: 2/5 — Shut off all power to the unit before servicing. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter to verify 24V output after install. Label all wires before disconnecting.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered specifically for the Carrier C50A506064 commercial rooftop/packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork, no returns.

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 C50A506064?
Yes. This is the factory-specified OEM transformer for the Carrier C50A506064. 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 C50A506064?
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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