OEM Carrier Control Transformer 40VA 120V/24V for Model C48A305062

This OEM control transformer is the factory-specified replacement for the Carrier C48A305062 packaged unit. The transformer steps down line voltage (120V) to the 24V signal voltage that powers your thermostat, contactor coil, and all low-voltage control circuits. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system makes no response to calls for heating or cooling, and in some cases a tripped secondary fuse is the only visible clue. OEM part numbers HT01BD236 and HT01BD702 are both factory-authorized replacements for this application.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | Class 2 transformer | Factory-matched to Carrier C48A305062 control board requirements
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances. Undersized or off-tolerance generic units can overheat, trip internal thermal protection, or deliver insufficient current to hold contactor coils — causing intermittent no-cooling complaints that are difficult to diagnose.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter. Always photograph or label wiring before disconnecting. Confirm secondary output is 24–28V with no load before reconnecting the control board.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Fits Carrier model C48A305062 packaged units. Replaces OEM part numbers HT01BD236 and HT01BD702. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our parts specialists are available to confirm fitment — reach out before you buy if you have any questions.