OEM Carrier 40VA Control Transformer for Model C48A502562

This OEM control transformer is the factory-specified replacement for the Carrier C48A502562 packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, contactor coil, and control board. When it fails — due to a shorted wire, overloaded control circuit, or age — absolutely nothing responds: the thermostat goes blank, relays won't energize, and the system is completely dead. Replacing this component is often the fastest fix for a "no power" service call.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part numbers HT01BD236 and HT01BD702 | Factory-matched to control circuit load requirements for C48A502562
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control circuit. Undersized or off-tolerance generic units can overheat, blow the secondary fuse repeatedly, or fail to sustain 24V under full relay load — leading to nuisance lockouts and callbacks.
• Install difficulty: 2/5 — Disconnect power at the disconnect box and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring connections before removal. Check for any shorted 24V wiring that caused the original failure before energizing the new transformer.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed for the Carrier C48A502562 packaged unit. Cross-references OEM part numbers HT01BD236 and HT01BD702 — both numbers describe the same transformer assembly. Confirm your unit's control voltage and VA rating on the data plate before ordering. Our fitment team is available to verify compatibility before you buy. Order today and your part ships immediately.