B.O.B DOLE said:have you checked the overheat stat ,pump,f & e tankstubbyrama said:Right. I have a Potterton Suprima 60...Lucky me. On fire up its seems to run fine but it just keeps on running untill the water in the system boils and comes out the over flow. Obviously loads of banging as well as the air in the system expands. I have replaced the thermister and it worked for about a week. But now when ever it is switched on, either hot water or heating it just runs away.
Another PCB?........or something else???
No the overheat stat has not been checked ( is it easy to do?). The Temp sensor (thirmistor) has been changed......I just slid it in.
But surly if the temp sensor was working then it would control the temp ot the boiler and it would fire up and stop when the selected temp was reached and if the overheat thermostat wasnt working then it would just lose it protection?.........please advise.
The pump is running although not sure if it is supposed to drip continuousl from the middle when the cap is removed.
and what is an F & E tank?