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OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZG050200 | National HVAC Parts
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZG050200 | National HVAC Parts

SKU: CARRIE-C4850C50ZG050200-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 120V/24V for Model C4850C50ZG050200

This is the factory OEM replacement control transformer (part number HT01BD236) for the Carrier C4850C50ZG050200 packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dead: the thermostat shows no power, the system will not respond to calls for heating or cooling, and no outputs will energize. It is often the first component to suspect when everything else checks out.

  • Specs: Input: 120V AC | Output: 24V AC | Rating: 40VA | OEM Part Number: HT01BD236 | Factory-matched for Carrier C4850C50ZG050200 packaged units
  • OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact VA and voltage specifications. Generic transformers can deliver inconsistent output voltage, causing nuisance lockouts, failed contactor pulls, or premature control board damage.
  • Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm secondary output reads 24–28V AC after installation before restoring control wiring. Label all low-voltage leads before removal.
  • Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our climate-controlled parts warehouse.

Compatibility: Designed specifically for the Carrier C4850C50ZG050200 packaged unit. Always verify input voltage, output voltage, and VA rating on your unit's data plate before ordering. If you need fitment confirmation, our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required.

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

Frequently Asked Questions

Does this Transformer fit my Carrier C4850C50ZG050200 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50ZG050200 | 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 C4850C50ZG050200 | 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.
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Mike Rivera
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