My Gerberit cistern has recently started overflowing into the toilet bowl after flushing and it is difficult to persuade it to stop. Is there anything I can do to help stop it before getting in a plumber?[/quote]
Is it flowing over the overflow in to the bowl ?
If not then either the valve is not shutting fully or the washer seal at the bottom of the valve is passing, poss scale or the washers deformed.
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