OEM Carrier 40VA 24V Control Transformer for PG9MAA060100ADKA

The control transformer steps your home's 120V line voltage down to the 24V low-voltage power that runs the thermostat, control board logic, gas valve, and relays in your Carrier PG9MAA furnace. It is the power supply for the entire control system. When it fails — usually from a shorted gas valve or seized relay overloading the secondary — the furnace goes completely dead: no inducer, no response to a heat call, and on systems powered from the furnace, a blank thermostat. Homeowners often find a dark thermostat or a furnace that shows no sign of life despite having power at the breaker. This is a 40VA control transformer with a 120V (and on many units a multi-tap 208/240V) primary and a 24V secondary — the standard control voltage for residential HVAC. The 40VA rating provides the inrush headroom needed to pull in the gas valve and relay coils at the same time. Many OEM units include an integral resettable circuit protector on the secondary; confirm primary tap voltage and mounting footprint against the original. An undersized generic transformer (for example a 20VA substitute) can power the board at idle but sags under the combined coil load, causing dropouts, chattering relays, and intermittent no-heat faults that are maddening to chase. The OEM 40VA unit holds a stable 24V under full load and matches Carrier's primary tap configuration so you don't risk wiring it to the wrong voltage. Install difficulty: 2/5. Tools: 1/4-inch nut driver, wire stripper, multimeter (verify 24 to 28V across the secondary after install). #1 safety warning: shut off power at the breaker before wiring — the primary side carries lethal 120V or higher. Ships same business day from our stocked warehouse on orders placed before 3 PM CST. Backed by a 1-year OEM warranty and 30-day hassle-free returns on uninstalled parts.

Compatibility

This part is compatible with Carrier model PG9MAA060100ADKA. Always verify the part number against your unit's data plate before ordering.

Why Choose OEM?

OEM parts are manufactured to the exact factory specifications for your unit. Generic aftermarket alternatives may fit physically but often use lower-rated components that reduce equipment life and void manufacturer warranties. When the cost difference between OEM and generic is $10-30, the OEM part is always the smarter investment on a system worth $5,000-$15,000.

Shipping & Returns

Same-day shipping on orders before 3 PM CST. Standard delivery 2-5 business days, express options available at checkout. 30-day hassle-free returns on uninstalled parts — free return shipping included. 1-year OEM factory warranty coverage.