What are the specs for this Transformer?

The correct replacement for Carrier model C4850C50Z2040200 | National HVAC Parts 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 C4850C50Z2040200 | National HVAC Parts.

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 C4850C50Z2040200 | National HVAC Parts

Name: OEM Carrier Transformer 40VA 120V to 24V for C4850C50Z2040200 | National HVAC Parts
Brand: Carrier
SKU: CARRIE-C4850C50Z2040200-TRANSFORMER-HT01BD236
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-C4850C50Z2040200-TRANSFORMER-HT01BD236 Brand: Carrier

✓ Guaranteed to fit — 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 40VA Control Transformer HT01BD236 for Model C4850C50Z2040200

This OEM replacement control transformer (part number HT01BD236) is the factory-specified unit for the Carrier C4850C50Z2040200 packaged heating and cooling system. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, contactor coils, and control board. When this component fails, the entire low-voltage control circuit goes dead — the thermostat displays nothing, no relays click, and the system will not respond to any call for heating or cooling.

Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Replaces OEM part number HT01BD236
OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage specifications for the C4850C50Z2040200. Generic transformers are often undersized in VA capacity, causing overheating and premature failure — especially in systems with multiple 24V loads like two-stage controls or zone boards.
Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminal connectors, multimeter. Label all wiring connections before removal and confirm polarity on reinstallation.
Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct fit for the Carrier C4850C50Z2040200 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — same-day shipping available on all in-stock orders.

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 C4850C50Z2040200 | National HVAC Parts?

Yes. This is the factory-specified OEM transformer for the Carrier C4850C50Z2040200 | National HVAC Parts. 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 C4850C50Z2040200 | National HVAC Parts?

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 to 24V for C4850C50Z2040200 | National HVAC Parts

OEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50Z2040200

Shipping Information

Return Policy

Frequently Asked Questions