Bosch Cross-Contamination Between Clean and Dirty Circuits

Water appears in the clean water tank after use, looking dirty

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

Faulty tank check valve, Cracked internal manifold, Incorrect tank installation, Damaged tank seals

Safety first: Unplug the unit and empty both tanks before inspection.

1. Inspect clean tank valve
- Check the one-way valve on the clean tank for damage or debris.
- Replace the valve or tank if it does not seal properly.
2. Check seals and manifolds
- Inspect internal manifolds where clean and dirty circuits are close.
- Look for cracks or misrouted hoses that could allow backflow.
3. Verify correct tank placement
- Ensure tanks are installed in the correct positions and fully seated.

Medium 3/5

Clean Water Tank Valve

Check Price on Amazon

We may earn a commission from links on this page.