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 Transformer 40VA 120V to 24V for C4850C50Z2055900 | National HVAC Parts
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50Z2055900 | National HVAC Parts

SKU: CARRIE-C4850C50Z2055900-TRANSFORMER-HT01BD236 Brand: Carrier

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Control Transformer 40VA for Model C4850C50Z2055900

This OEM replacement control transformer (part number HT01BD236) is the factory-specified unit for the Carrier C4850C50Z2055900 packaged gas/electric system. The transformer steps down line voltage from 120V to the 24V signal required by your thermostat, contactor coils, gas valve, and all low-voltage control circuits. When this component fails, the entire control system loses power — your thermostat goes blank, nothing responds, and the system will not heat or cool regardless of settings.

  • Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | Factory-matched OEM part number HT01BD236 | Designed for Carrier packaged unit control circuits
  • OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA rating and thermal protection standards. Undersized or off-brand transformers can brown out under load, triggering nuisance lockouts and potentially damaging downstream control boards and contactors.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 24V output after install). Label or photograph all low-voltage wiring connections before removing the old unit.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our climate-controlled warehouse.

Compatibility: This transformer is engineered for the Carrier C4850C50Z2055900 packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility — order with confidence and get your system back online 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 C4850C50Z2055900 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50Z2055900 | 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 C4850C50Z2055900 | 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