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I get the crap in system diagnosis - though the system was flushed and cleaned when the boiler was installed 2 years ago, and the water I drained when fixing the leak was clean and clear and smelling of inhibitor (that doesn't mean the heat exchanger wasn't collecting it all up for me). I...

I've a problem with hot water supply from my combi boiler as above. When a hot water tap is opened, water starts to flow, the boiler fires up and the boiler temp display goes up slowly to around 60 degrees, all as usual, and the water gets warm. Then, the boiler temp starts to rise very fast...