Dishwasher makes high-pitched squealing or whining noise during operation

Safety first: Unplug the dishwasher before accessing the base.

• Check water supply: Ensure adequate water pressure and clean inlet filters to prevent cavitation.
• Bleed air: Run a full cycle after ensuring the tub fills properly to purge air from the system.
• Inspect pump: Access the circulation pump and listen closely while the machine runs (use caution and keep clear of live parts). A persistent squeal usually indicates bearing wear.
• Replace pump: If bearings are noisy or there is noticeable shaft play, replace the circulation pump assembly.