Winco Transfer Switch Contactor Chatter

Clicking or chattering noise from transfer switch when utility power is present.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Low control voltage to ATS coil, Loose control wiring from Winco controller, Failing ATS coil, Utility voltage fluctuations

Safety first: Transfer switches contain live utility power. Only qualified personnel should remove covers.

Observe conditions: Note if chatter occurs only during brownouts or low utility voltage.
Inspect control wiring: Have an electrician check the low-voltage control wires from the generator to the ATS coil for loose connections.
Measure control voltage: If control voltage is low or unstable, the ATS coil or control board may need replacement.

Hard 4/5

Automatic Transfer Switch Contactor

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