your right it is the one where you can get at the valve, there is a ring of screws that hold it together, housing the diaphragm i presume ?
would i have to drain the system to remove these screws ? i think it may be worth having a go at changing the diaphragm first it looks a lot easier to...
Thanks for the reply, have checked and it looks like you are correct, if i push the switch it fires the boiler, there are quite a few pipes connected to the valve, is it a difficult job to change ?
Any kind poster good enough to let me have a pdf for a Worcester bosch 240 ?
Think i need to change something, not getting hot water at the taps but heating is working fine, any guidance would be very welcome indeed
Thanks