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Hi, i have a valliant combi boiler. Whenever i turn the hot water tap in the kitchen the pressure suddenly drops that very second and because of that my boiler fails to ignite and i do not get any hot water. Any idea what could be causing the problem? I have checked the pressure bar and it...

Hello there. Would be grateful if someone can point me what the problem could be on the following: Whenever i turn on the tap for hot water i.e in bathroom or kitchen sink the boiler fires and all is well. If having a bath or washing up the temp rises slowly to 60 degrees. after that...