Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier Transformer 40VA 120V/24V for C50A304051
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A304051

SKU: CARRIE-C50A304051-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C50A304051 — or your money back. Terms

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Transformer 40VA 120V/24V for Model C50A304051

This is the OEM factory-specified control circuit transformer for the Carrier C50A304051 commercial packaged unit. The transformer steps down 120V line voltage to 24V AC to power the control board, thermostat, and all low-voltage switching components. When this part fails, the entire control circuit goes dead — you'll see a blank thermostat, no response to calls for heating or cooling, and no contactor activity. It is one of the first components to check when a unit has completely stopped responding.

  • Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched for Carrier C50A304051
  • OEM vs Generic: The OEM transformer meets exact VA load ratings required by the Carrier control board. Undersized or off-tolerance generic units can overheat, trip internal fuses, or fail prematurely under full control circuit load — particularly in packaged units with multiple low-voltage accessories.
  • Install difficulty: 2/5 — Shut off all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output on secondary terminals before reconnecting control wiring. Photograph existing wire routing before removal.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C50A304051 commercial rooftop/packaged unit. Always verify the VA rating and primary/secondary voltages on your unit's data plate before ordering. Our parts specialists are available to confirm fitment — 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 C50A304051?
Yes. This is the factory-specified OEM transformer for the Carrier C50A304051. 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 C50A304051?
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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online