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Thanks for that chrisR,,is it more likely to be temp sensor,,also forgot to say gas flame not very high,,

i have moved house and unfortunately there is a protherm 100e boiler fitted,,problem is when hot tap turned on boiler starts up and runs for about 2 mins hot water at tap, then gas flame goes out,,boiler starts up again and the same thing happens,,same happens with central heating,, any1 know...