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OEM Carrier Transformer 40VA 120V/24V for C50A303061
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A303061

SKU: CARRIE-C50A303061-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C50A303061 — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer for Model C50A303061

This OEM Carrier transformer (part# HT01BD236) is the factory-specified replacement for the Carrier C50A303061 commercial rooftop unit. The transformer steps down 120V line voltage to the 24V AC signal required to power the entire control circuit — including the thermostat, contactor coil, gas valve, and all safety switches. When this component fails, the result is a completely unresponsive system: no thermostat communication, no fan, no heating or cooling. If your unit is dead silent with confirmed line voltage present, a failed transformer is one of the first components to test.

  • Specs: 40VA rating | 120V primary input | 24V secondary output | Factory-matched impedance and winding | Compatible with standard HVAC control circuits
  • OEM vs Generic: OEM transformers (HT01BD236) are wound to Carrier's exact VA and voltage tolerances, ensuring stable 24V output under full control-circuit load. Generic units may sag under load, causing intermittent lockouts, nuisance tripping, or premature contactor coil failure.
  • Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (verify 0V before touching terminals). Note wiring connections before removal; primary wires connect to 120V supply, secondary wires feed the 24V control board circuit.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier C50A303061 commercial packaged rooftop unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility — reach out before you buy 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 C50A303061?
Yes. This is the factory-specified OEM transformer for the Carrier C50A303061. 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 C50A303061?
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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