Although rare, a leak may occur under specific conditions. In most cases, the cause can be traced back to one of the following factors:

Water hammer
Water hammer can occur when a valve is closed suddenly or after a temporary water outage. These situations generate pressure waves inside the pipes. When the water supply is restored, sudden pressure differences between water and trapped air may occur, reaching peaks of up to 25 bar. This phenomenon is often accompanied by loud knocking noises within the plumbing system and can affect the cartridge seal.

Debris in the water supply
Small particles such as sand or fine debris may be present in water pipes. If these particles enter the cartridge, they can scratch the mirror-polished ceramic discs that ensure a perfect seal. Once damaged, the cartridge may begin to leak.

Please note that cartridges, spindles and aerators are wear components and are therefore not covered by the manufacturer’s warranty. Nevertheless, we remain committed to supporting our customers. Replacement cartridges are available at fair and transparent prices.

As different tap models use different cartridges, we recommend contacting us with your order or invoice number so we can identify the correct replacement. Cartridge replacement is straightforward, provided the component is correctly positioned and not overtightened. A contact pressure of approximately 1.5 kg is sufficient.

Before restoring water flow, ensure the lever is fully open to allow trapped air to escape. Upon request, we can also provide a video guide.

Clean the aerator with a 50/50 mixture of vinegar and water

1. Unscrew the aerator following the instructions for your specific kitchen mixer.
2. Fill a cup with half water and half vinegar and fully immerse the aerator. Be careful NOT to immerse the chrome parts as you may damage the faucet's finish.
3. Let it soak overnight to dissolve all stains and dirt. Leave the aerator submerged in this mixture for at least 6-12 hours, depending on the level of limescale in your area.
4. Once the limescale is removed, rinse thoroughly with clean running water and then screw it back in.

Clean the dual-spray showerhead

1. To clean the dual-spray showerhead of your kitchen faucet, follow these instructions.
2. To remove stains or dirt, first rinse with clean water and then use a 50/50 mixture of vinegar and water. Only immerse the plastic parts in this solution. PLEASE, DO NOT IMMERSE METAL PARTS IN THE VINEGAR SOLUTION AS IT MAY DISCOLOR THE SURFACE.
3. After finishing, rinse with clean water and reassemble the aerator as described in the instructions.

The operating resistance of the lever is factory-calibrated to ensure optimal control and sealing. However, two situations may affect its movement:

If the cartridge retaining nut has been tightened beyond the factory setting, lever movement may become noticeably stiffer. The recommended tightening torque is 12 Nm. Loosening the nut slightly may improve movement, but this adjustment should only be carried out by experienced users, as sufficient contact pressure is required to maintain a watertight seal.

If fine debris becomes lodged between the ceramic discs of the cartridge, friction may increase and performance may be affected. In this case, inspect the aerator for sand or particles. If debris is present, cartridge replacement may be necessary.

Our taps are designed to operate under the following conditions:

• Recommended operating pressure: 1.5 – 4.5 bar
  
• Recommended water temperature: 5°C – 65°C
  

If water pressure is below the recommended range, please verify your household water supply system. The tap itself is equipped solely with an open/close function and does not regulate incoming pressure.

Remove the aerator and inspect it for dirt or debris. Clean it thoroughly as described above.

If the issue persists after cleaning, please send us a short video showing the problem at customercare@viziotechnik.de, so our team can assist you further.

Limescale may accumulate over time depending on local water hardness. Please follow the instructions provided in the section How do I clean or replace the aerator? to restore proper flow.

Dripping may be caused by one of the following factors:

• A worn or damaged cartridge or spindle
  
• Debris inside the aerator
  

In the latter case, please clean the aerator as described above. If the issue persists, the cartridge may need to be replaced.

If gaskets show signs of wear, we offer dedicated gasket kits in our spare parts section. Please ensure you select the correct kit by referring to the product code indicated on the corresponding page.

If you experience an issue not covered in this section, our team is here to assist you.

Please contact our customer care at customercare@viziotechnik.de and describe the situation in detail. To ensure fast and accurate support, we may ask for information from your purchase receipt, so we kindly recommend having it available.

Our experts will guide you through the next steps with the same care and precision that define every Viziotechnik product.