OEM Carrier Control Circuit Transformer 40VA for Model C4850C50ZG060900

This OEM replacement transformer (part# HT01BD236) is the factory-specified step-down transformer for the Carrier C4850C50ZG060900 packaged unit. The transformer converts 120V line voltage to 24V DC to power the entire control circuit — including the thermostat, control board, contactor coil, and all safety switches. When it fails, the result is total control loss: the thermostat goes blank, the system won't respond to any input, and no components energize. A failed transformer is often misdiagnosed as a control board failure, making correct identification critical before replacing more expensive parts.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched output for Carrier control circuits | Direct OEM replacement for part# HT01BD236
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic units can cause nuisance tripping, brownouts in the control circuit, or premature board failure — making the OEM part a worthwhile investment on a critical component.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is absent before proceeding. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Photograph existing wiring connections before removing the old unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C4850C50ZG060900 5-ton packaged gas/electric unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — zero-hassle returns if it doesn't work for your application.