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OEM Carrier Transformer 40VA 120V/24V for C4850C48ZG040200
Carrier

OEM Carrier Transformer 40VA 120V/24V for C4850C48ZG040200

SKU: CARRIE-C4850C48ZG040200-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C4850C48ZG040200 — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V/24V for Model C4850C48ZG040200

This OEM replacement control transformer (part number HT01BD236) is the factory-specified unit for the Carrier C4850C48ZG040200 packaged HVAC system. The transformer steps down line voltage from 120V to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, nothing works: the thermostat goes dark, the system won't respond to calls for heating or cooling, and you may find a blown fuse on the control board caused by a shorted secondary winding.

  • Specs: 40VA rated | Primary: 120V | Secondary: 24V AC | OEM Part Number: HT01BD236 | Factory-matched output voltage and VA capacity for full circuit protection
  • OEM vs Generic: The OEM HT01BD236 transformer meets Carrier's exact VA rating and thermal cutoff specifications. Undersized generic transformers can overheat under normal control circuit loads, leading to repeated failures and potential damage to the control board.
  • Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Label or photograph existing wiring before disconnecting. Primary and secondary terminals are clearly marked.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C4850C48ZG040200 packaged unit. Verify primary input voltage and VA rating on your unit's data plate before ordering to confirm correct fitment. Our team is available to verify compatibility before you buy — don't hesitate to reach out. Order today for same-day shipping.

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 C4850C48ZG040200?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C48ZG040200. 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 C4850C48ZG040200?
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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