this only happens after a water damage:
either the front board (mostly the buttons) got wet or the small board inside with the western sockets got wet
in some cases it helps to clean the boards, but mostly there is too much
corrosion after a water damage and you can't be sure that the doser will work in future without problems - in my opinion a too high risk
both parts are available as spare parts
please contact your retailer for further details
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