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Try looking in your loft at the cold feed and expansion tank (the small black one) Has it got any water in it? If Yes then find where water enters into system (in airing cupboard probably) make sure it is not blocked.... ie any valves on the line that have accidentally been turned off!! or have...

I have a Range powermax 155. I have to have the CH on to get any hot water. I have the HW set for 24h and CH on timed but there is not enough HW to run a bath. If I set the CH on 24h there is plenty of HW. Recently had to re-pressurise exp vessle as system kept blowing out all the water...