OEM Carrier Control Transformer 40VA 120V/24V for Model C4850C50Z3050600

This OEM Carrier transformer (part number HT01BD236) is the factory-specified step-down transformer for the C4850C50Z3050600 packaged unit. It converts 120V line voltage to the 24V AC signal that powers the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the system goes completely unresponsive: the thermostat goes blank, nothing energizes, and the unit will not heat or cool. A failed transformer is often mistaken for a bad thermostat or control board, making it the first component to test when the control circuit is dead.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 output | Factory-matched impedance for Carrier C4850C50Z3050600 packaged unit controls
• OEM vs Generic: This OEM unit (HT01BD236) is wound to Carrier's exact VA and impedance specifications. Undersized or off-brand transformers can overheat, trip their internal fuse, or fail to sustain 24V under full control-circuit load — leading to intermittent lockouts and repeat service calls.
• Install difficulty: 2/5 — Disconnect power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Test incoming 120V and output 24V with a multimeter after installation to confirm proper operation before buttoning up the unit.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Engineered specifically for Carrier model C4850C50Z3050600 packaged units. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before your order ships — no guesswork, no returns.