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OEM Carrier Transformer 40VA 120V-24V for C50A304052
Carrier

OEM Carrier Transformer 40VA 120V-24V for C50A304052

SKU: CARRIE-C50A304052-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer for Model C50A304052

This OEM replacement transformer (part# HT01BD236) is the factory-specified step-down transformer for the Carrier C50A304052 commercial packaged unit. The transformer converts 120V line voltage to the 24V signal voltage required to power the control board, thermostat, contactor coil, and all low-voltage control circuits. When it fails, the entire control system goes dark — you'll see a blank thermostat display, no response to heat or cool calls, and no diagnostic fault codes because the board itself has no power.

  • Specs: 40VA rated | 120V primary / 24V secondary | Class 2 output | Designed for Carrier C50A304052 commercial rooftop applications | OEM part number HT01BD236
  • OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage tolerances for the C50A304052 control circuit. Generic transformers frequently under-deliver VA capacity under load, causing nuisance trips of downstream fuses and shortening contactor coil life.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminal connectors, multimeter for output voltage verification. Always confirm 24V output before reconnecting control wiring.
  • Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier C50A304052 packaged units. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If your fuse or circuit breaker repeatedly trips after transformer replacement, inspect downstream wiring for shorts before installing. Our fitment team is available to confirm compatibility before you order — same-day shipping on all in-stock parts.

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 C50A304052?
Yes. This is the factory-specified OEM transformer for the Carrier C50A304052. 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 C50A304052?
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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