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Just had a further look and have noticed the purple wiring going into what I assume is the thermister have scoring marks on them caused by the yellow cap, going to splice the wiring, ps am I correct in saying the thermister is a small black switch going into the black plastic piping after the...

i know, everyone says the same :(

guys, i have the above boiler, and before xmas had a problem where i had no hot water, i called an engineer who replaced the diaphragm and piston on the 3 way valve between the CH and DHW. for this i payed a lovely sum of £240! and i still have an intermittent fault.(he did say though it might...