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How can I stop my toilet cistern from overflowing - there's no ballcock?

My dual flush push button toilet cistern fills up ok after flushing. Once it's full, if I turn on the hot tap in the sink, the cistern starts to fill up again then overflows into the toilet bowl. Sometimes the cistern fills up and overflows for no apparent reason. Very annoying.

JB
November 2010
Yes I have a combi boiler but no, hot water isn't going into either the cistern or the toilet - it's cold water.

JB
November 2010
why would hot water be going in to the cistern ?

are you on a combi boiler system by any chance ?

hi-spec plumbing & heating (essex)
November 2010
is it hot water going into the toilet , if so call a plumber to fix pipe work

micky b
November 2010
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