OEM Carrier 40VA Control Transformer for Model C48A305061

This OEM replacement transformer (part# HT01BD236) is the factory-specified control circuit transformer for the Carrier C48A305061 packaged unit. The transformer steps down 120V line voltage to the 24V signal required to power your thermostat, contactor coil, and all low-voltage controls. When this component fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no safety controls can operate. It is often the first component to check when nothing works at all.

• Specs: 40VA rating | 120V primary / 24V secondary | Hardwired terminals | Factory-matched OEM part number HT01BD236
• OEM vs Generic: This is a genuine OEM Carrier transformer built to exact factory VA and voltage tolerances. Generic transformers may be undersized for VA load, causing overheating, tripped internal fuses, or premature failure under full control circuit demand.
• Install difficulty: 2/5 — Disconnect power at the disconnect box and verify zero voltage with a multimeter before handling. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wiring connections before removal. Check for a shorted low-voltage circuit (common cause of transformer failure) before installing the replacement.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C48A305061 packaged unit. Always verify the 40VA rating and 120V/24V configuration against your unit's wiring diagram and data plate before ordering. If your existing transformer shows signs of burning or a blown internal fuse, inspect the entire 24V control circuit for shorts prior to replacement. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you order — reach out before you buy.