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Engineer just came out, removed a small amount of gunk and works fine again. Says if happens again, they will powerflush system.

Hi there, I have an Alpha CD25X Combi boiler, and a few weeks ago the hot water stopped working, ie it was just lukewarm. My landlord sent his plumber round, who then sent an Alpha engineer round as the boiler is under warrarty. The Alpha engineer shows up and clears our the hot water...