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OEM Carrier Transformer 40VA 120V/24V for C50A702564
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A702564

SKU: CARRIE-C50A702564-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA for Model C50A702564

This OEM Carrier transformer (part number HT01BD702) is the factory-specified replacement for the C50A702564 commercial packaged unit. The transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this component fails, the system goes completely silent: the thermostat displays nothing, no relays click, and no heating or cooling cycle initiates. It is often the first component to check when the system appears totally unresponsive.

  • Specs: 40VA rating | Primary voltage: 120V | Secondary voltage: 24V | Factory-matched OEM construction | Class 2 control circuit transformer
  • OEM vs Generic: OEM transformers from Carrier are wound to exact VA tolerances, protecting downstream components like control boards and gas valves from voltage fluctuations. Generic transformers often run undersized on VA output, causing nuisance tripping and premature control board failure.
  • Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Photograph all wiring connections before disconnecting. Replace any blown 3A fuse on the control board at the same time.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier C50A702564 commercial rooftop/packaged unit. Verify primary and secondary voltage ratings on your unit's data plate before ordering. If you are unsure of fitment, our technical team confirms compatibility before you purchase — no guesswork required.

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 C50A702564?
Yes. This is the factory-specified OEM transformer for the Carrier C50A702564. 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 C50A702564?
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