What are the specs for this Transformer?

The correct replacement for Carrier model C4850C50AK03051 — 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 C4850C50AK03051 — 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 Transformer 40VA 120V to 24V for C4850C50AK03051 — Ships Today

Name: OEM Carrier Transformer 40VA 120V to 24V for C4850C50AK03051 — Ships Today
Brand: Carrier
SKU: CARRIE-C4850C50AK03051-TRANSFORMER-HT01BD236
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-C4850C50AK03051-TRANSFORMER-HT01BD236 Brand: Carrier

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OEM Carrier Transformer 40VA 120V–24V for Model C4850C50AK03051

This is the OEM factory replacement transformer (part number HT01BD236) for the Carrier C4850C50AK03051 packaged unit. The transformer steps high-voltage 120V line power down to the 24V control voltage that powers your thermostat, contactor coil, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any call for heating or cooling, and no components will energize. It is often the first part to check when a system appears completely unresponsive despite confirmed line voltage at the unit.

Specs: Input 120VAC | Output 24VAC | 40VA rated | OEM part number HT01BD236 | Factory-matched primary and secondary winding tolerances
OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage tolerances, ensuring stable 24V output under full control-circuit load. Generic transformers can sag under load, causing intermittent lockouts and nuisance tripping of low-voltage fuses.
Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Label and photograph all low-voltage wiring connections before disconnecting the old transformer.
Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C4850C50AK03051 packaged unit. Verify input voltage (120V) and VA rating on your existing transformer's label before ordering. If your unit runs on 208/240V primary input, do not use this transformer — contact our parts team to confirm fitment. Orders placed before 3 PM local time ship 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 Transformer 40VA 120...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier C4850C50AK03051 — Ships Today?

Yes. This is the factory-specified OEM transformer for the Carrier C4850C50AK03051 — 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 C4850C50AK03051 — 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 Transformer 40VA 120V to 24V for C4850C50AK03051 — Ships Today

OEM Carrier Transformer 40VA 120V–24V for Model C4850C50AK03051

Shipping Information

Return Policy

Frequently Asked Questions