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Thanks Tony. Appreciate your comments - I'll keep my fingers crossed that the addition of appliances will sort the problem out. Alex

Hi, I've just finished a refurb and have a little problem. Everytime I turn a cold tap on, the boiler kicks in for a moment, and then turns itself off again. I looked at the boiler and it says DHW mode (Vaillant 838). After a bit of reading - it seems as if I could have a 'dead leg' in my...