Electric drive motor removed from a washing machine

Generic photo: Poo (Wikimedia Commons user) · Public Domain

Hall sensor and tach generator (motor speed feedback)

Hall sensors are 3-wire devices (supply, ground, signal) that switch as magnets pass; tach generators are 2-wire coils that make a small AC voltage as the motor turns. Test the right way for the type.

Single source ~30 min moderateBrands: All

Before you start

Disconnect power before unplugging sensors
Live DC checks are low voltage but the board nearby carries line voltage

Diagnostic steps

Unlock all 6 steps with expected values

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

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