AEG Bypass Valve / Brew Unit Dumping Water

Water collects quickly in the drip tray; very little coffee reaches the cup.

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

Brew unit overpressure relief opening, Worn brew unit seals, Stuck bypass valve, Misaligned brew piston

Safety: Unplug before removing the brew unit.

Clean and lubricate brew unit: Remove the brew group, clean thoroughly, and lubricate piston seals with food-grade silicone grease.
Check for cracks: Inspect the brew unit body for cracks or broken parts that could cause internal leakage.
Descale: Descale the machine to reduce resistance in the coffee circuit, which can trigger bypass.
Inspect bypass valve: If accessible, check the bypass valve in the hydraulic block for debris and replace if stuck open.

Medium 3/5

Brew Unit Seals / Bypass Valve

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