Trane TRR1581 Transformer 340155-7026 such as the W973 or

such as the W973 or M7415 series

As a veteran-choice HVAC zone valve motor

Dual **1140/940 RPM** capability allows for performance matching across different York equipment models

or failure of the motor to start despite receiving power from the control board

Common indicators include a furnace that clicks but fails to light

Trane TRR1581 Transformer 340155-7026 such as the W973 orThe Trane TRR1581 Transformer is a heavy duty 75VA HVAC replacement part engineered for demanding residential and commercial applications. Designed to step down 200 230V primary voltage to a stable 24V secondary output, this component ensures consistent low voltage power for critical systems including furnace control boards, 24V thermostats, and contactor coils. As a genuine Trane OEM transformer, it eliminates the guesswork of universal fitments,