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I'm sure the engineer used something the first time, no idea what though. When we started having probs I saw him using some heavy duty flushing agent. Do you think the boiler may be damaged?

Can any one help us with our Glow-Worm 18hxi condensing boiler? It was fitted 12 months ago and after a few weeks it started to make a very loud droning noise when it first comes on, this would then fade away after 15 mins.The system has been flushed 3 times - with proper stuff - seems to cure...