What are the specs for this Transformer?

The correct replacement for Carrier model C4850C50Z8090610 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 C4850C50Z8090610.

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 Transformer 120V-24V for C4850C50Z8090610

Name: OEM Carrier 40VA Transformer 120V-24V for C4850C50Z8090610
Brand: Carrier
SKU: CARRIE-C4850C50Z8090610-TRANSFORMER-HT01BD236
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-C4850C50Z8090610-TRANSFORMER-HT01BD236 Brand: Carrier

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OEM Carrier 40VA Control Transformer for Model C4850C50Z8090610

This OEM replacement control transformer (part number HT01BD236) is the factory-specified unit for the Carrier C4850C50Z8090610 packaged HVAC system. The transformer steps down line voltage (120V) to the 24V signal required by your thermostat, contactor coil, and control board. When this component fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, the system stops responding to calls for heating or cooling, and no fault codes appear because the board itself has no power to operate.

Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Factory-matched impedance and thermal protection | OEM part number HT01BD236
OEM vs Generic: The OEM HT01BD236 transformer is wound to Carrier's exact VA rating and thermal cutout spec. Undersized or off-brand transformers can overdraw current, trip repeatedly, or cause nuisance lockouts — especially in multi-stage or communicating systems.
Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is absent before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Note existing primary and secondary wire connections before removal. Restore power only after all connections are secure and insulated.
Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C4850C50Z8090610 packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltage on the unit's data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility prior to purchase — same-day shipping 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 $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 40VA Transformer 120...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier C4850C50Z8090610?

Yes. This is the factory-specified OEM transformer for the Carrier C4850C50Z8090610. 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 C4850C50Z8090610?

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 Transformer 120V-24V for C4850C50Z8090610

OEM Carrier 40VA Control Transformer for Model C4850C50Z8090610

Shipping Information

Return Policy

Frequently Asked Questions