Winterhalter Unwanted Drain / Siphoning

Machine drains immediately after filling and does not maintain water level.

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

Drain hose installed too low, Siphon effect due to incorrect plumbing, Stuck drain valve (on models with drain valve), Faulty level sensor

Safety first: Turn off power and water before adjusting plumbing.

Check drain hose height: Ensure the hose rises to the recommended height before connecting to the building drain.
Correct siphon connection: Use a proper standpipe or air gap as specified in the installation manual.
Inspect drain valve: On machines with a motorized drain valve, check that it closes fully and is not blocked by debris.
Adjust installation: Have a plumber correct any improper drain connections causing siphoning.

Medium 3/5

Motorized Drain Valve

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