What are the specs for this Transformer?

The correct replacement for Carrier model C50A204064 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 C50A204064.

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 C50A204064

Name: OEM Carrier Transformer 40VA 120V-24V for C50A204064
Brand: Carrier
SKU: CARRIE-C50A204064-TRANSFORMER-HT01BD702
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-C50A204064-TRANSFORMER-HT01BD702 Brand: Carrier

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OEM Carrier 40VA Control Transformer for Model C50A204064

This OEM replacement transformer (part number HT01BD702) is the factory-specified control circuit transformer for the Carrier C50A204064 commercial packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power your thermostat, control board, contactor coils, and all low-voltage control components. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system stops responding to any calls for heating or cooling, and no components will energize.

Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | Factory-matched OEM part number HT01BD702 | Hardwired lead connections
OEM vs Generic: The OEM HT01BD702 transformer is wound to exact factory VA tolerances, ensuring stable 24V output under full control circuit load. Undersized or off-tolerance generic transformers can overheat, trip internal breakers, or fail prematurely when multiple control components draw simultaneously.
Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire strippers, multimeter (to confirm 24V output after install). Label or photograph all wire connections before removing the old unit. Always verify primary voltage at the transformer terminals matches your supply before energizing.
Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C50A204064 commercial rooftop packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists confirm fitment before you buy — contact us today and get your system 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 $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 C50A204064?

Yes. This is the factory-specified OEM transformer for the Carrier C50A204064. 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 C50A204064?

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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OEM Carrier Transformer 40VA 120V-24V for C50A204064

OEM Carrier 40VA Control Transformer for Model C50A204064

Shipping Information

Return Policy

Frequently Asked Questions