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- 29 Nov 2006
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My oldish Worchester Bosch combi seems to be starting to play up. It's about 10 years old and has never failed - except recently it has decided to fluctate between hot and cold on the hot water delivery to the taps. You get about 1min piping hot water - then it goes to cold for about 30 seconds - then back to hot again - and continues to fluctuate. Can anyone offer advice of what the cause might be? Thanks in advance!