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OEM Carrier Transformer 40VA 120V/24V for C50A403552
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A403552

SKU: CARRIE-C50A403552-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V/24V for Model C50A403552

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C50A403552 commercial packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the control board, thermostat, and all low-voltage components throughout the system. When it fails, nothing in the control circuit responds — the thermostat goes blank, the system refuses to start, and the unit appears completely dead despite line power being present. A failed transformer is often confirmed by measuring 0V on the secondary terminals with a multimeter.

  • Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched output voltage and VA capacity for full control circuit compatibility
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control boards. Undersized or off-tolerance generic transformers can cause nuisance lockouts, board damage, and premature contactor coil failure due to voltage sag under load.
  • Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, and wire nuts or spade connectors. Label or photograph all wiring connections before removal. Confirm 24V output on the new transformer before closing the cabinet.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our stocked warehouse.

Compatibility: Designed specifically for the Carrier C50A403552 commercial rooftop/packaged unit. Verify primary voltage (120V) and VA rating on your unit's wiring diagram or data plate before ordering. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions. In stock and ships today.

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 C50A403552?
Yes. This is the factory-specified OEM transformer for the Carrier C50A403552. 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 C50A403552?
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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