OEM Carrier Transformer 40VA 120V to 24V for Model C4850C48Z6075610

This is the factory OEM replacement transformer (part# HT01BD236) for the Carrier C4850C48Z6075610 packaged unit. The transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, nothing in the system responds: the thermostat goes blank, no relays click, and the unit will not attempt to start in any mode. A failed transformer is often caused by a shorted control component that draws excess current, so always inspect the secondary circuit before replacing.

• Specs: 40VA rated | Primary: 120V | Secondary: 24V | OEM part# HT01BD236 | Factory-matched impedance and thermal protection
• OEM vs Generic: OEM transformers include built-in secondary overcurrent protection calibrated to Carrier's control circuit draw. Generic units often lack proper thermal cutoffs, risking repeat failures if an underlying short is present.
• Install difficulty: 2/5 — Disconnect power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output and check for secondary shorts). Label all wires before disconnecting. Confirm 24V on secondary terminals before reassembling.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C4850C48Z6075610 packaged unit. Verify transformer VA rating and primary/secondary voltages on your unit's wiring diagram or data plate before ordering. If you have questions about fitment, our HVAC parts specialists confirm compatibility before you buy — no guesswork.