Operation Manual
65Maintenance
Unit component What to clean and how to clean
Hoses
• Remove any limescale by slightly knocking on the tubes
using a rubber hammer. Then, rinse the tubes well with
hot tap water.
Inlet valve
• Use a soft bristled brush (do not use a wire brush) to
remove any limescale inside the inlet valve and on the
strainer.
• Wash inlet valve and strainer insert with a lukewarm
soap solution, then rinse well with tap water.
Let the inlet valve dry before reinstallation!
Drain pump
• Use a soft bristled brush (do not use a wire brush) to
remove any limescale from the pump housing and the
pump wheel.
• Wipe pump wheel with a damp cloth. Wash the pump
housing with a lukewarm soap solution and rinse well
with tap water.
Let the drain pump dry before reinstallation!
Level unit and Filling cup
• Disassemble level unit and lling cup.
• Remove any limescale from the level unit and the lling
cup and its connectors using a soft bristled brush (do
not use a wire brush).
If level unit and lling cup is heavily calcied, place it in
an 8% formic acid solution (observe safety notes in
chapter 6.6), until the limescale comes off.
• Wash level unit and lling cup with a lukewarm soap
solution and rinse well with tap water.
• Reassemble level unit and lling cup.
O-ring
O-ring
Float
Strainer insert