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Hi my vaillant boiler is working okay it seems, the temp goes up when i turn on the hot water but it isnt actually the heat that it is saying it is. There are no F codes but ive had s36, s10, s27 and s14 Please help xxx

Hi,Ijope someone can helpme.I have a Valiant Boiler and in the last 2 weeks a small leak has appeared under it. Over the last few days Ive had to press the flame button to relight it to get hot water. The temp goes up then very rapidly goes back down. I cant even get hot water as of today and...