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OEM Carrier Transformer 40VA 120V/24V for C50A205061
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A205061

SKU: CARRIE-C50A205061-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BD236 for Model C50A205061

This OEM step-down transformer (part number HT01BD236) is the factory-specified replacement for the Carrier C50A205061 commercial rooftop unit. The transformer converts 120V line voltage to the 24V AC signal that powers your entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When this part fails, absolutely nothing in the system responds: no call for heat or cool, no contactor engagement, and no fault codes on the board. If your system is completely unresponsive with line voltage confirmed at the unit, a failed transformer is the most common cause.

  • Specs: 40VA rating | 120V primary / 24V secondary | Single-phase | OEM part number HT01BD236 | Factory-matched output voltage tolerance
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications for the C50A205061 platform. Undersized or off-tolerance generic transformers can cause erratic thermostat behavior, nuisance tripping of the secondary fuse, and premature control board failure.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching terminals). Photograph or label all wiring before disconnecting. Secondary fuse should also be inspected and replaced if blown.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C50A205061 commercial packaged rooftop unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy.

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 C50A205061?
Yes. This is the factory-specified OEM transformer for the Carrier C50A205061. 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 C50A205061?
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
HVAC Parts Specialist — Online