Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZG050500 | National HVAC Parts
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZG050500 | National HVAC Parts

SKU: CARRIE-C4850C50ZG050500-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit — or your money back. Terms

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V–24V for Model C4850C50ZG050500

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C4850C50ZG050500 packaged unit. The transformer steps down 120V line voltage to 24V AC to power the thermostat, control board, contactor coil, and all low-voltage switching circuits. When this transformer fails, the entire control circuit goes dark — the thermostat loses power, nothing calls for heat or cooling, and the system will not respond to any commands. A blown fuse on the secondary side is often the first clue; a failed transformer is the next suspect.

  • Specs: Input 120V AC | Output 24V AC | 40VA rating | OEM part number HT01BD236 | Direct plug-and-play replacement for Carrier C4850C50ZG050500
  • OEM vs Generic: This is the genuine factory OEM transformer, wound to exact VA and voltage tolerances. Generic transformers often run undersized VA ratings, causing overheating, nuisance fuse failures, and premature contactor coil burnout.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label all wire connections before removing the old unit.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier C4850C50ZG050500 packaged unit. Always verify your existing transformer's input voltage, output voltage, and VA rating on the data label before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — same-day shipping guaranteed on in-stock OEM parts.

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 C4850C50ZG050500 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50ZG050500 | 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 C4850C50ZG050500 | 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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online