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OEM Carrier Transformer 40VA 120V to 24V for C48A303562 | National HVAC Parts
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C48A303562 | National HVAC Parts

SKU: CARRIE-C48A303562-TRANSFORMER-HT01BD236 Brand: Carrier
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OEM Carrier Control Transformer 40VA 120V to 24V for Model C48A303562

This OEM control circuit transformer is the factory-specified replacement for the Carrier C48A303562 packaged unit. The transformer steps down 120V line voltage to the 24V signal needed to power your thermostat, contactor coil, and all low-voltage controls. When this component fails, the entire control circuit goes dead — the thermostat loses power, the system won't respond to any calls for heating or cooling, and nothing operates. It is one of the first components to test when a system appears completely unresponsive despite confirmed line voltage at the unit.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM Part Numbers: HT01BD236 and HT01BD702 | Direct plug-in replacement with factory-matched terminals
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and impedance specifications, ensuring stable 24V output under full control-circuit load. Generic transformers may sag under load, causing erratic contactor chatter or nuisance lockouts.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 24V secondary output after installation before closing the unit. Always confirm the old transformer is truly failed before replacement — check for a shorted low-voltage wiring fault first, which can blow a new transformer immediately.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C48A303562 packaged unit. Cross-references OEM part numbers HT01BD236 and HT01BD702. Confirm your unit's control board accepts a standard 40VA 120V/24V transformer by checking the data plate inside the control access panel before ordering. Our parts specialists are available to verify fitment — reach out before you order if you have any questions.

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 $99
  • 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 C48A303562 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C48A303562 | National HVAC Parts. 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 C48A303562 | National HVAC Parts?
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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