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OEM Carrier Transformer 40VA 120V/24V for C50A302052
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A302052

SKU: CARRIE-C50A302052-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C50A302052 — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 120V to 24V for Model C50A302052

This OEM replacement control transformer (part# HT01BD236) is the factory-specified unit for the Carrier C50A302052 packaged rooftop system. The transformer steps down line voltage from 120V to the 24V signal required to power the thermostat, control board, contactors, and all low-voltage safety circuits. When this component fails, the entire control circuit loses power — resulting in a completely unresponsive system, a blank thermostat display, or tripped secondary fuses with no obvious cause.

  • Specs: 40VA output rating | Primary: 120V | Secondary: 24V | Class 2 transformer | Matches OEM mounting footprint and terminal configuration for drop-in installation
  • OEM vs Generic: This is the genuine Carrier OEM part (HT01BD236), wound to exact factory VA and voltage specifications. Generic transformers often run under-rated VA, causing the secondary fuse to blow repeatedly under normal load — a common and frustrating misdiagnosis.
  • Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before handling. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wires before disconnecting and confirm the secondary fuse is intact before condemning the transformer.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C50A302052 commercial packaged rooftop unit. Verify primary input voltage and VA rating on your unit's wiring diagram or data plate before ordering. If your thermostat is dark and your secondary fuse keeps blowing, this transformer is the most likely cause. Our fitment team is available to confirm compatibility before you order — same-day shipping means your system is back online fast.

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 C50A302052?
Yes. This is the factory-specified OEM transformer for the Carrier C50A302052. 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 C50A302052?
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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