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OEM Carrier 40VA 120V to 24V Control Transformer for C4850C48ZN050600 | National HVAC Parts
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C4850C48ZN050600 | National HVAC Parts

SKU: CARRIE-C4850C48ZN050600-TRANSFORMER-HT01BD236 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA for Model C4850C48ZN050600

This OEM replacement transformer (part #HT01BD236) is the factory-specified control circuit transformer for the Carrier C4850C48ZN050600 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 this component fails, the entire control circuit goes dead: the thermostat shows no response, the system won't call for heating or cooling, and no error codes will display because the board itself has no power.

  • Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01BD236 | Factory-matched for Carrier C4850C48ZN050600 packaged units
  • OEM vs Generic: This is the exact factory OEM transformer, wound to Carrier's specifications. Generic replacements may share the 40VA rating but often use lower-grade insulation and less precise voltage output, which can damage sensitive control boards over time.
  • Install difficulty: 2/5 — Turn off all power at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Note wire colors and terminal labels before disconnecting. Verify 24V output after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C4850C48ZN050600 packaged unit. Verify your existing transformer's input/output voltage and VA rating against your unit's data plate before ordering. If your control circuit is completely unresponsive and your breakers are intact, this transformer is the most likely cause. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back up and running today.

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

Frequently Asked Questions

Does this Transformer fit my Carrier C4850C48ZN050600 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C48ZN050600 | 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 C4850C48ZN050600 | 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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