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Just an update in case it helps anyone in the future: Turns out the UV water filter on my private supply had clogged over time and reduced the flow to the point where there was insufficient flow to trigger the flowswitch under DHW demand so the boiler wasn't kicking in. Replaced filter and...

Thanks for your help guys - much appreciated. Angus

Thanks, Is the diaphragm within the diverter valve? If so then why would the burner come on just because the shower temperature is turned to max? I see there is a flow switch mounted on the valve. I would have thought that the burner would come on any time the flow switch detects DHW...

Thanks for the reply. I've booked a Bosch engineer visit for next month so will see what they say. I presume you are referring to the diverter valve which might well be the problem as I have had the radiators heat up a couple of times (but not always) when this problem happens. If it is the...

Hi, According to the manual, the burner should come on under hot water demand. Mine doesn't unless the shower temperature control is cranked up to maximum which then is too hot to use. Any suggestions what might be wrong would be appreciated. At the moment I get a short warm shower until the...