What are the specs for this Transformer?

The correct replacement for Carrier model C4850C48ZN070200 — 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 C4850C48ZN070200 — 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 Transformer for C4850C48ZN070200 — Ships Today

Name: OEM Carrier 40VA 120V to 24V Transformer for C4850C48ZN070200 — Ships Today
Brand: Carrier
SKU: CARRIE-C4850C48ZN070200-TRANSFORMER-HT01BD236
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-C4850C48ZN070200-TRANSFORMER-HT01BD236 Brand: Carrier

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OEM Carrier Control Circuit Transformer 40VA for Model C4850C48ZN070200

This OEM replacement transformer (part number HT01BD236) is the factory-specified step-down transformer for the Carrier C4850C48ZN070200 packaged unit. It converts 120V line voltage to the 24V signal required to power the control board, thermostat circuit, and all low-voltage components. When this transformer fails, the entire control circuit goes dead — the thermostat shows no response, the unit won't call for heating or cooling, and nothing happens when you adjust the setpoint. It is often the first component to check when a system appears completely unresponsive.

Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | Factory-matched OEM part number HT01BD236
OEM vs Generic: The OEM HT01BD236 transformer is wound to exact Carrier factory specifications, ensuring proper VA capacity and voltage regulation. Undersized or off-tolerance generic transformers can overheat, blow fuses repeatedly, or damage sensitive control boards.
Install difficulty: 2/5 — Disconnect all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter for voltage verification. Label or photograph all low-voltage wiring connections before removal. Standard wire-to-terminal swap with no refrigerant involvement.
Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Designed and factory-matched for the Carrier C4850C48ZN070200 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltage from the data plate before ordering. If you are unsure of fitment, our HVAC parts specialists can 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 40VA 120V to 24V Tra...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier C4850C48ZN070200 — Ships Today?

Yes. This is the factory-specified OEM transformer for the Carrier C4850C48ZN070200 — 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 C4850C48ZN070200 — 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 Transformer for C4850C48ZN070200 — Ships Today

OEM Carrier Control Circuit Transformer 40VA for Model C4850C48ZN070200

Shipping Information

Return Policy

Frequently Asked Questions