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OEM Carrier Transformer 40VA 120V/24V for C50A203561
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A203561

SKU: CARRIE-C50A203561-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V/24V for Model C50A203561

This is the factory OEM replacement transformer (part number HT01BD236) designed for the Carrier C50A203561 commercial packaged unit. The transformer steps down 120V line voltage to 24V to power the entire control circuit — including the thermostat, contactors, gas valve, and control board. When this component fails, the entire control system goes dark: the thermostat loses power, the unit won't respond to calls for heating or cooling, and nothing works. It is one of the first components to check when diagnosing a completely unresponsive system.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched electrical ratings for the C50A203561 control circuit
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications required by Carrier's control board. Undersized or off-tolerance generic transformers can overload under peak demand, blow fuses, or damage downstream control components — making OEM the only recommended choice for commercial equipment.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify 120V input and 24V output with a multimeter after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C50A203561 commercial rooftop/packaged unit. Verify your unit's control voltage and VA requirements on the data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy — ensuring a correct first-time repair.

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 C50A203561?
Yes. This is the factory-specified OEM transformer for the Carrier C50A203561. 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 C50A203561?
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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