What are the specs for this Transformer?

The correct replacement for Carrier model C50A203051 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Carrier equipment which lists the model number C50A203051.

Is this transformer compatible with Bryant or Payne systems too?

Many Carrier parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A203051

Name: OEM Carrier Transformer 40VA 120V/24V for C50A203051
Brand: Carrier
SKU: CARRIE-C50A203051-TRANSFORMER-HT01BD236
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-C50A203051-TRANSFORMER-HT01BD236 Brand: Carrier

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

OEM Carrier 40VA Control Transformer for Model C50A203051

This OEM replacement transformer (part# HT01BD236) is the factory-specified control transformer for the Carrier C50A203051 commercial packaged unit. The transformer steps down line voltage (120V) to the 24V control circuit voltage that powers your thermostat, contactor coils, and all low-voltage control signals. When this component fails, the entire control circuit goes dead — the thermostat loses power, nothing responds, and the system will not heat or cool. If you have 120V at the primary side but no 24V output, a failed transformer is the most common culprit.

Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched output tolerance for stable control circuit operation
OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA and voltage specifications, ensuring reliable 24V delivery under full control circuit load. Generic units may sag under load, causing erratic thermostat behavior or nuisance lockouts.
Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Verify 0V on primary leads before touching any wiring. Label all low-voltage wires before disconnecting the secondary.
Warranty: 1-year OEM factory warranty. Orders placed by 3PM local time ship same business day from our warehouse.

Compatibility: Designed for the Carrier C50A203051 commercial rooftop/packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If you have questions about fitment, our HVAC parts team is available to confirm compatibility before you buy — no guesswork required.

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

OEM Carrier Transformer 40VA 120...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier C50A203051?

Yes. This is the factory-specified OEM transformer for the Carrier C50A203051. 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 C50A203051?

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.

Menu

OEM Carrier Transformer 40VA 120V/24V for C50A203051

OEM Carrier 40VA Control Transformer for Model C50A203051

Shipping Information

Return Policy

Frequently Asked Questions