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DHW flow now measured at less than 4 l/min. Should be lot higher. Engineer has changed gas valve (other unrelated problem), removed and de-scaled DHW heat exchanger, changed divertor valve and now OK, removed and checked flow regulator (aqua sensor I believe) and now OK, removed and checked DHW...

Last couple of weeks the following happens: Boiler goes to lock out, F 28 fault on display. Manual states no gas, insufficient gas or elecrodes problems. But after resetting the boiler about 4 times it all comes back to life and stays like that for up to 2 or 3 days. Then lock out occurs again...