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OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN055600 — Ships Today
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN055600 — Ships Today

SKU: CARRIE-C4850C50ZN055600-TRANSFORMER-HT01BD236 Brand: Carrier
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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V/24V for Model C4850C50ZN055600

This is the factory OEM step-down transformer (part number HT01BD236) designed for the Carrier C4850C50ZN055600 packaged unit. The transformer converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this part fails, the entire control system goes dark — your thermostat will display nothing, the system will not respond to calls for heating or cooling, and no fault codes will be generated because the board itself has lost power.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Compatible with standard Class 2 wiring | Compact footprint for drop-in replacement
  • OEM vs Generic: The OEM HT01BD236 is wound and insulated to Carrier's exact factory specification, ensuring proper VA output under load. Off-brand transformers are often under-rated and can sag under full control circuit load, causing intermittent lockouts and nuisance faults.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after installation). Photograph or label all wiring connections before removal.
  • Warranty: 1-year OEM factory warranty. Orders received by 3 PM ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C4850C50ZN055600 packaged unit. Always verify your existing transformer's primary/secondary voltage and VA rating against your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — 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 $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 C4850C50ZN055600 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50ZN055600 — 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 C4850C50ZN055600 — 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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Mike Rivera
HVAC Parts Specialist — Online