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Well I have a suprima 60 and I have had problems with no temp control and banging...etc...I have changed the PCB to the new modern one as suggested in my last post......and the system has worked fine for the last three weeks...but then at 0630 in the morning....the system vents to the expantion...

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...