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Problem now sorted. Diverter valve was stuck in DHW position. Had a new diverter valve motor fitted today, and both DHW and CH are working fine. Total cost: £128.

Thanks all. boilerdoktor: no tapping sound, and the hot water temperature is unchanged from when the central heating was working. Agile: when there is a demand for heating, the boiler fires up but then goes off after about 5-10 secs. The pump is working after that, as the boilers hums and...

Agile, Thanks for the quick response. As we bought the house and boiler last year, I do not know its service history. I would not expect it to have been serviced regularly though. Are you saying this is a must for the future? I will look into finding a local engineer to take a look...

I have a Worcester Bosch 28i Junior combi boiler that I believe is about 5 years old (it came with the house we bought last year). It has always worked fine, but suddenly the central heating has stopped working. When there is a demand for central heating, the boiler fires up and the...