Hi from retired Englishman in SW France,
I suspect there is either limescale in the thread of the filter plug OR behind the filter itself and this is stopping the plug from being screwed home completely. Remove the plug, pull out the filter, clean filter compartment all round, especially at the back AND ensure the plug thread is completely free of limescale ;-0)
If this has assisted you please consider a 4 thumbs up for the rating.
Thanks and good luck!
John C
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