OEM Carrier 40VA Control Transformer for Model C4850C50Z3060200

This OEM control transformer (part# HT01BD236) is the factory-specified replacement for the Carrier C4850C50Z3060200 packaged unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When it fails, absolutely nothing responds — the thermostat goes blank, the unit won't call for heating or cooling, and the system appears completely dead. A failed transformer is often misdiagnosed as a control board failure, making this a critical first diagnostic step.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched impedance and thermal protection | OEM part number HT01BD236
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for the Carrier C4850C50Z3060200 control circuit. Undersized or off-tolerance generic units can overheat, trip internal thermal fuses, and damage downstream control boards — a far more expensive repair.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Verify 24V output with a multimeter after installation before restoring full power. Photograph all wiring connections before disconnecting.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed for the Carrier C4850C50Z3060200 packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the data plate or wiring diagram inside the unit's access panel before ordering. If you're unsure of fitment, our HVAC parts specialists can confirm before you buy — no guesswork required. Order now and ship today.