Hi all , went to look at a dead isar today , power is ok into the boiler , fuse on circuit board ok but the boiler is completly dead , checked the main switch works ok but there is nothing on the display panel and it does absolutly nothing , so it looks like the pcb has gone , is this a common fault on these wonderfull isar boilers ????????? ( waiting for lots of coments on how c**p they are ) Plus there are two pcbs how can I check which has gone ???