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OEM Carrier Transformer 40VA 120V/24V for C50A503552
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A503552

SKU: CARRIE-C50A503552-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C50A503552 — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BD236 for Model C50A503552

This OEM control transformer (part number HT01BD236) is the factory-specified replacement for the Carrier C50A503552 commercial rooftop unit. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coils, gas valve, and control board. When this transformer fails, absolutely nothing works: the thermostat goes dark, the system won't respond to any call for heating or cooling, and you may find a blown fuse on the control board from a secondary-side short.

  • Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Replaces OEM part number HT01BD236 | Factory-matched output tolerance for reliable low-voltage operation
  • OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA and voltage specifications. Generic alternatives often run under-rated VA, causing thermal shutdowns and nuisance blown fuses under normal control circuit loads.
  • Install Difficulty: 2/5 — Disconnect all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Always verify no secondary-side short exists before replacing the transformer — a shorted wire will destroy the new unit immediately.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier C50A503552 commercial packaged rooftop unit. Verify primary voltage (120V) and VA rating on your unit's wiring diagram or data plate before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence and get back up and running today.

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 C50A503552?
Yes. This is the factory-specified OEM transformer for the Carrier C50A503552. 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 C50A503552?
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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