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thanks for prompt reply, the problem has always existed, recently found I had no hot water at all so had the flow switch replaced, the engineer left me a report with lots of figures of test readings that he assurred me were good, however the problem still exists. If there is sludge in the...

Help please! I have a Ariston Microcombi 23 mffi boiler, installed approx 3yrs ago, the central heating has never been a problem feeding 7 rads but can never get much tempature in the DHW side, it also goes from warm to cold to warm etc when running the tap. Have just had it serviced this week...