The control board in a vacuum cleaner acts as the appliance's brain, managing power distribution, motor speed, suction levels, and sensor functions. It ensures that components like the motor and sensors operate in sync, allowing the vacuum to perform tasks such as adjusting suction power or providing overload protection. Over time, the control board may need replacement due to electrical failures, damage from overloading, worn or degraded components, or faulty communication with sensors or the motor. In advanced vacuums, software or firmware issues can also affect the board's functionality. When the vacuum fails to power on, responds erratically, or exhibits performance issues, a faulty control board may be the cause, and replacing it can often restore normal operation.