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OEM Carrier Transformer 40VA 120V/24V for C50A303561
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A303561

SKU: CARRIE-C50A303561-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V/24V for Model C50A303561

This is the factory OEM replacement control transformer (part number HT01BD236) for the Carrier C50A303561 commercial rooftop unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, contactor coils, gas valve, and control board. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, nothing responds, and the system will not operate in any mode. It is often the first component to inspect when a unit shows absolutely no control activity.

  • Specs: 40VA rated | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched for exact fit and VA load capacity
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class, ensuring stable 24V output under full control circuit load. Undersized generic transformers can overheat, trip their internal breaker, or fail prematurely when multiple components draw simultaneously.
  • Install difficulty: 2/5 — Shut off all power at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wire connections before removal. Verify 24V output with a multimeter after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty. Orders placed by 3PM local time ship the same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C50A303561 commercial rooftop packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit's wiring diagram or data plate before ordering. Our fitment team is available to verify compatibility prior to purchase — same-day shipping ensures minimal downtime on commercial equipment.

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 C50A303561?
Yes. This is the factory-specified OEM transformer for the Carrier C50A303561. 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 C50A303561?
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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