What are the specs for this Transformer?

The correct replacement for Carrier model C4850C50AW03051 — Ships Today 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 C4850C50AW03051 — Ships Today.

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 40VA 120V to 24V Control Transformer for C4850C50AW03051 — Ships Today

Name: OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50AW03051 — Ships Today
Brand: Carrier
SKU: CARRIE-C4850C50AW03051-TRANSFORMER-HT01BD236
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-C4850C50AW03051-TRANSFORMER-HT01BD236 Brand: Carrier

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OEM Carrier Transformer 40VA 120V/24V for Model C4850C50AW03051

This is the factory OEM replacement transformer (part number HT01BD236) for the Carrier C4850C50AW03051 packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, the result is typically a completely unresponsive system: blank thermostat display, no response to calls for heating or cooling, and no contactor engagement. A failed transformer is often caused by a shorted control wire, a seized contactor coil, or a wiring fault that draws excessive current through the secondary winding.

Specs: Input 120V AC | Output 24V AC | 40VA rating | OEM part number HT01BD236 | Factory-matched impedance and thermal protection
OEM vs Generic: This OEM unit is wound and rated to Carrier's exact specifications, ensuring proper VA headroom for all connected low-voltage loads. Undersized or off-spec generic transformers can overheat and fail prematurely, especially in systems with multiple low-voltage accessories.
Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Always check for shorted low-voltage wiring before installing the new transformer to prevent repeat failure.
Warranty: 1-year OEM factory warranty. Ships same business day from our stocked warehouse.

Compatibility: Designed for the Carrier C4850C50AW03051 packaged unit. Confirm input/output voltage and VA rating on your existing transformer's label before ordering. If you are unsure of fitment, our HVAC parts team is available to verify compatibility before you purchase. Order today and your part ships the same business day.

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

OEM Carrier 40VA 120V to 24V Con...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier C4850C50AW03051 — Ships Today?

Yes. This is the factory-specified OEM transformer for the Carrier C4850C50AW03051 — Ships Today. 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 C4850C50AW03051 — Ships Today?

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 40VA 120V to 24V Control Transformer for C4850C50AW03051 — Ships Today

OEM Carrier Transformer 40VA 120V/24V for Model C4850C50AW03051

Shipping Information

Return Policy

Frequently Asked Questions