This boiler was leaking through the heat exchanger. We replaced the boiler with a Potterton Gold Combi. When I was draining the boiler there was very little water coming out, I presume that the water must have been leaked out. But It was found that the the feed tank ball valve was tied at closed position using a phone charger cable. So it look like the heatexchanger was split due to lack of water due to some cowboy plumber left the system with no feed of water.
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