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Hi, I think this issue has been covered before but my question has still not been answered so any help is greatly appreciated. My sister has a combi system with 4 rads and a towel rail. When the heating comes on all rads heat up, after an hour one radiator in the front room cools and eventually...

Hi, i have recently installed a new central heating system which consists of 6 rads and a vaillant ecotec pro 24 combi boiler. All seemed to be working ok for a week until a loud vibration sound was heard from the boiler. It seems to happen intermittently after the heating has been on for a...