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Introduction
If the faucet is dripping and limescale stains are forming in the tub, it is time to take the faucet apart and descale it. This usually helps.
If that does not help, or if there is a larger leak, you can get replacement parts from many retailers. Unfortunately, there are many similar models. It is also worth comparing prices. The exact same original ceramic valve insert is offered for between 22 and over 60 euros. Prices for the backflow preventer also vary by a factor of 3. Also pay attention to shipping costs and minimum order values.
As for tools, you will need: a 17 mm open-ended wrench, water pump pliers, a rag, descaler, and a small and a larger flathead screwdriver
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Large leaks occur when the faucet no longer shuts off the water supply perfectly.
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Small amounts can also drip into the tub if the diverter between the shower and tub is defective (e.g., a leaking backflow preventer) and the water stored in the hose slowly drips out.
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As a test, unscrew the shower hose and wipe everything dry with a towel. Observe it the next day. If there is water in the tub then, it is the shut-off to the supply line (steps 2 to 5). If it remains dry there, then the diverter is the likely cause (step 6).
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Open a tap in the bathroom so the line is depressurized.
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The handle for adjusting the water volume is on the left for this model. Follow the same procedure for the right handle.
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Rotate the handle 180° toward the back until the eco-button is at the rear.
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The cover plate has a fine slot, which is now at the front. Carefully pry it off using a small flathead screwdriver.
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After removing the cover plate, the screw is accessible and can be loosened with a wide flathead screwdriver.
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Unplug the handle and the white plastic part in the axial direction. Note or take a picture of the position of the locking tab on the gray part.
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Unplug the gray plastic part in the axial direction
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Use a 17 mm open-ended wrench to unscrew the ceramic upper part. If it is stuck, hold the fitting firmly with your other hand to prevent applying force to the supply line.
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The ceramic upper part has two external seals. One at the end with a groove (non-replaceable) and one at the shoulder (replaceable, O-ring 18.2 x 1.7).
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Clean the valve seat with a cloth soaked in descaler.
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Clean all parts with descaler and, if necessary, a dish brush and sponge (soap residue cannot be removed with descaler). Be careful: the handle has a thin, delicate chrome layer on the plastic. A citric acid-based descaler, light heat, and a 30-minute wait time worked here.
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Rotate the ceramic upper part on the control spindle several times and place it back into the descaler.
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Rinse all parts thoroughly and reinstall them. When installing, ensure the locking tabs are in the correct position. Before tightening the screw, check if the water-saving button works; if necessary, readjust the plastic parts.
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For faucets with a shower hose, check and clean the backflow preventer as the next step.
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Remove the shower hose.
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Carefully unscrew the part to which the hose is attached using pipe pliers (wrap a cloth around it). Unfortunately, the part has no flat surfaces for a wrench.
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The backflow preventer is the white part. It is held in place only by an O-ring and can be pushed out from the inside (fine thread) to the outside (coarse thread) using a blunt object (e.g., the handle of a pair of pliers).
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The backflow preventer (part number 08565000) is only available as a complete replacement part (4 to 20 EUR). Attention: there is another part with the same name in the water supply line (not identical). The part can be disassembled into 3 plastic pieces, one spring, and 2 O-rings for cleaning.
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During reassembly, the part with the red O-ring must first be pushed into the metal part from the outside (coarse thread).
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