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 C4850C50Z2035200 | National HVAC Parts
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50Z2035200 | National HVAC Parts

SKU: CARRIE-C4850C50Z2035200-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 C4850C50Z2035200

This OEM replacement control transformer (part number HT01BD236) is the factory-specified unit for the Carrier C4850C50Z2035200 packaged heating and cooling system. The transformer steps down line voltage from 120V to the 24V signal required by the thermostat, contactor coils, gas valve, and control board. When this component fails, the entire low-voltage control circuit loses power — the thermostat goes blank, the system stops responding to calls for heating or cooling, and no components energize. A blown fuse on the secondary side or a burned winding are the most common failure signatures.

  • Specs: Input 120V AC | Output 24V AC | 40VA rated | Class 2 transformer | OEM part number HT01BD236 | Factory-matched windings and insulation rating
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications, ensuring stable 24V output under full load. Generic units frequently under-deliver on VA ratings, causing voltage sag that triggers nuisance lockouts and shortens contactor coil life.
  • Install difficulty: 2/5 — Shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to verify 24V output after installation. Label or photograph all low-voltage wiring before disconnecting terminals.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier C4850C50Z2035200 packaged unit. Confirm input voltage (120V) and VA rating (40VA) against your unit's wiring diagram and data plate before ordering. Our parts specialists are available to verify fitment — 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 $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 C4850C50Z2035200 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50Z2035200 | 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 C4850C50Z2035200 | 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