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OEM Carrier Transformer 40VA 120V/24V for C50A506051
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A506051

SKU: CARRIE-C50A506051-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BD236 for Model C50A506051

This OEM replacement transformer (part number HT01BD236) is the factory-specified step-down transformer for the Carrier C50A506051 commercial packaged unit. The transformer converts 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage control circuit components. When this part fails, the entire control circuit goes dead — the thermostat display may go blank, the system will not respond to any calls for heating or cooling, and nothing will start. It is often the first component to check when a unit appears completely unresponsive despite confirmed line voltage at the disconnect.

  • Specs: 40VA rated | Primary: 120V | Secondary: 24V | Class 2 control transformer | OEM part number HT01BD236 | Factory-matched for C50A506051 wiring harness and mounting configuration
  • OEM vs Generic: This OEM unit is wound to exact VA and voltage tolerance specifications. Generic transformers frequently run undersized VA ratings, causing them to overheat and fail prematurely — especially under the multi-zone control loads common in commercial packaged units like the C50A506051.
  • Install Difficulty: 2/5 — Shut off all power at the disconnect and verify voltage is absent with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire nuts or spade connectors. Label all low-voltage wiring before disconnecting. Confirm new transformer output reads 24–28V AC before restoring full system power.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier C50A506051 commercial rooftop/packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — same-day shipping available on all in-stock OEM 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 C50A506051?
Yes. This is the factory-specified OEM transformer for the Carrier C50A506051. 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 C50A506051?
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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