Bosch Circulation Pump Bearing Wear or Cavitation

Dishwasher makes a high-pitched whining or squealing noise during operation.

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

Worn pump bearings, Air in circulation system, Restricted water flow through pump, Improperly seated filters causing cavitation

Safety first: Disconnect power before accessing internal components.

Check water level and filters: Ensure the dishwasher fills to the correct level and that filters are clean and properly locked in place.
Inspect spray arms and sump: Remove any obstructions that could restrict flow.
Run with empty load: Run a short cycle with no dishes to see if noise persists. If it does, the pump is likely the source.
Replace circulation pump: If the pump continues to whine or squeal, replace the Bosch circulation pump/heat pump assembly.

Hard 4/5

Circulation Pump / Heat Pump Assembly

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