I have a "ROCA" toilet & cistern assembly. When the cistern is filled up with water there is no leakage between the toilet pan and the cistern directly mounted on it. Water is leaking between the cistern and the toilet pan only when flushing. Can anyone please comment? Thanks

R. Beltramini, March 2016

This is what I said yesterday...

Between the two elements - pan and cistern - is a soft washer called a doughnut (donut) because it looks like a doughnut. A metal plate presses down on it - it forms the seal. The metal plate has two wing nuts to apply the pressure. You can reach the nuts - one each side below and at the rear of the pan.

Youtube has videos (donut washer)

If that doesn't work then call a plumber.

If you have the confidence you can do the job yourself - remove and empty cistern - fit new washer - put it back together - about 30 mins.

You can see the arrangement if you squint along the join from the side - the cistern needs to be flat and parallel against the pan else an effective seal is difficult.

Continuing Good Luck..., March 2016