Dishwasher makes a high-pitched whining noise during operation.

Safety first: Disconnect power before accessing the base.

• Check water supply: Ensure the inlet hose is not kinked and the tap is fully open to prevent cavitation.
• Run a cleaning cycle: Use a dishwasher cleaner to remove limescale that can affect pump operation.
• Listen at base: With the machine running, carefully listen near the base to confirm the noise is from the circulation pump.
• Replace pump: If the whining persists and is clearly from the pump, the circulation pump motor bearings are likely worn and the assembly should be replaced.