OEM Carrier Control Transformer 40VA 120V/24V for Model C4850C48Z6090610

This is the OEM factory-replacement control transformer (part# HT01BD236) designed for the Carrier C4850C48Z6090610 packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching circuits. When this part fails, the entire control circuit goes dark — the thermostat becomes unresponsive, contactors won't energize, and the system will not heat or cool regardless of any other component's condition. A failed transformer is often misdiagnosed as a bad thermostat or control board, making correct identification critical before replacing costlier parts.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 control circuit transformer | OEM part number HT01BD236 | Factory-matched construction for long service life
• OEM vs Generic: OEM transformers are wound to exact VA tolerances ensuring stable 24V output under full load. Undersized generic units can sag below 24V, causing erratic contactor chatter, nuisance lockouts, and premature control board failure.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before servicing. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade terminals, multimeter. Label all low-voltage wires before disconnecting. Replacement typically takes 20–30 minutes for a qualified technician.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock units ship the same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model C4850C48Z6090610 packaged units. Always confirm your unit's data plate lists 120V primary / 24V secondary / 40VA control transformer before ordering. Our fitment specialists are available to verify compatibility before you purchase — call or chat today. Order now and receive same-day shipping on all in-stock parts.