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OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN055200 — Ships Today
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN055200 — Ships Today

SKU: CARRIE-C4850C50ZN055200-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V to 24V for Model C4850C50ZN055200

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C4850C50ZN055200 packaged unit. The transformer steps down 120V line voltage to 24V AC, powering the thermostat, control board, contactor coil, and all low-voltage control circuit components. When this transformer fails, nothing in the control circuit responds — the thermostat goes blank, the system won't call for heating or cooling, and the unit appears completely dead despite having line voltage present. A shorted transformer may also blow the control circuit fuse repeatedly.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched output voltage for reliable control circuit operation
  • OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and insulation class. Undersized or off-tolerance generic transformers can overheat under normal control circuit loads, causing intermittent lockouts and shortened service life.
  • Install difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring connections before disconnecting. Verify primary and secondary voltages after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for Carrier model C4850C50ZN055200 packaged units. Verify the transformer's VA rating and primary/secondary voltage on your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping ensures you're back up and running fast.

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 C4850C50ZN055200 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50ZN055200 — 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 C4850C50ZN055200 — 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
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