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OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN030200 | National HVAC Parts
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN030200 | National HVAC Parts

SKU: CARRIE-C4850C50ZN030200-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 40VA Control Transformer for Model C4850C50ZN030200 (HT01BD236)

This OEM control transformer (part# HT01BD236) is the factory-specified replacement for the Carrier C4850C50ZN030200 packaged unit. The transformer steps down line voltage (120V) to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and gas valve. When it fails, nothing in the system responds: the thermostat goes blank, the unit refuses to start, and no error codes are displayed because the control board itself has lost power.

  • Specs: Input: 120V AC | Output: 24V AC | Rating: 40VA | OEM Part Number: HT01BD236 | Factory-matched for Carrier C4850C50ZN030200 packaged systems
  • OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact VA and voltage tolerances. Generic transformers often underperform at rated load, causing erratic control behavior, nuisance lockouts, or premature secondary-side failures in multi-zone systems.
  • Install Difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output with a multimeter after installation before closing the panel.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our HVAC parts warehouse.

Compatibility: Designed for the Carrier C4850C50ZN030200 packaged gas/electric unit. Always verify your unit's control circuit voltage and VA requirement on the data plate or wiring diagram before ordering. Our parts specialists are available to confirm fitment — contact us before you buy if you have any doubts.

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 C4850C50ZN030200 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50ZN030200 | 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 C4850C50ZN030200 | 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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