OEM Carrier 40VA Control Transformer for Model C4850C50Z3055900

This OEM replacement control transformer (part number HT01BD236) is the factory-specified unit for the Carrier C4850C50Z3055900 packaged system. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, contactor coil, gas valve, and control board. When the transformer fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, the system won't respond to any call for heating or cooling, and no fault codes will display because the board itself has no power. A failed transformer is often misdiagnosed as a bad control board or thermostat, making correct identification critical before replacing more expensive components.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched terminals for direct drop-in installation
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class, ensuring stable 24V output under full load. Generic transformers often run undersized VA ratings, causing voltage sag that trips safeties or damages downstream components.
• Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Always confirm primary voltage matches your supply before energizing.
• Warranty: 1-year OEM factory warranty included. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier C4850C50Z3055900 packaged unit. Verify transformer VA rating and primary/secondary voltages against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — don't guess on a part this critical to your control circuit. Order now and ship today.