OEM Carrier 40VA Control Transformer for Model C50A403052

This OEM replacement transformer (part# HT01BD236) is the factory-specified control transformer for the Carrier C50A403052 commercial rooftop unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, contactor coils, gas valve, and control board. When this component fails, the entire control circuit goes dark — the thermostat loses power, the system stops responding to calls for heating or cooling, and nothing operates. If you have 120V at the primary but zero volts at the secondary, this transformer is the likely culprit.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched output tolerance for reliable low-voltage signaling
• OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact specifications, ensuring stable 24V output under full load. Generic substitutes often exhibit voltage sag under load, causing erratic board behavior, nuisance lockouts, or premature contactor coil failure.
• Install difficulty: 2/5 — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wiring before removal. Verify primary voltage matches your supply before energizing.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders ship same business day from our stocked warehouse.

Compatibility: Engineered for the Carrier C50A403052 commercial rooftop packaged unit. Always confirm your unit's control circuit voltage and VA requirements on the data plate before ordering. Our parts specialists are available to verify fitment — reach out before you buy for total confidence. In stock and ready to ship today.