Contactor contacts that are badly pitted can cause the motor to burn out.

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When contactor contacts are badly pitted, the path for current becomes rough and the effective contact resistance increases. That higher resistance causes more heat to be generated when the motor current flows, especially during startup when the motor draws a large inrush current. The extra heat from this resistance can heat the contacts and transfer to the motor windings and insulation, accelerating insulation damage and potentially causing winding burnout. Pitted contacts may also weld or stick, leading to improper switching and grinding torque issues, which further stress the motor and can contribute to overheating. Because these issues create conditions that can drive the motor toward overheating and failure, the statement is true.