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hi could anybody tell me how to change the diaphram on the above boiler? can i just take the houseing off with the two screws on the front of it? then undo the small pipes remove the houseing then undo the six screws in the housing and replace the diaphram. them put the lot back. looks...

I have the above boiler ,with a problem with the hot water. (there is none) in this forum in august it mentions the same problem, and goes on about the diaphram that needs changing. But local plumb centre says you cannot change the diaphram. I need to change the divertor valve at £70 odd...