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I have just tried what you told me to do and the boiler stays off, so it must be the flow switch is jammed as you said. However on tracing the wires back to the switch this is what I have but it looks nothing like what other pictures seem to show, is this the right part and how do I...

Thank you for that info, I will try that when I get home from work tomorrow. Can I ask one last question if it is a jammed flow switch what is involved in fixing it?

Hi thanks for your replies, I have spent all day trying to suss out what I have done wrong but I don't think I have, so I have uploaded before and after photos (luckily I always take photos before fore I start something like this) just incase someone can see my glaring mistake. Before...

I'm not quite sure what you mean. Is there something I should have removed from the pcb before I fitted it?

Everytime since the new pcbs were fitted

thanks for that both of you. Another question can I remove and clean the switch or do I have to buy a new one and replace.

Thanks again for the reply, now this is where I start to fail in the knowledge stacks what is the dhw flow switch I have added a picture of my boiler is it the green connector on the pipe to the to mid left?

Hi Thanks for the reply. You know I hadn't thought about that, your right it should only ignite on demand, so that must be the root of the problem. What tells the boiler to ignite and boil the water? could that be the fault?

Hi All first post here. We have a Worcestor 350 Boiler the one with two pumps. Recently it was cutting out when running hot water too long the button on top (lockout reset button) had to be reset to enable it again, so we had the thermostat replaced along with the Expansion vessel and the...