Recent content by jjimbo

Have held a cardboard tube to my ear other end at various parts of boiler the noise is loudest at the divertor valve / heat exchanger, have just turned the pump speed down from setting 3 to 2 the boiler is now quiet until the hw is switched on, finding that I can stop it screeching if I turn...

Hi There, Got a Sime 100 Format C, been OK for 7 years, now developed a problem, when CH is switched on and after say 5 mins a screeching noise is coming from the boiler, turn on the hot water tap it stops, turn off the hot water tap it restarts screeching but much louder, only way to stop the...