Hello
Some months back (pre condensor boiler requirement) we rushed into
having a ferroli combination modena boiler fitted but only now since
finishing the kitchen have we noticed a problem. Its this. When the
heating is on turning on the hot water tap cuts to hot water which is
fine. However turning on the cold water also cuts off the heating. The
boiler does not light up suggesting tripping of the hot water
valve(?).We thought fitting a single check valve on the cold water feed
into the boiler might solve the problem but it hasn't. Help and advice
much appreciated.

Kaz