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Dave, I looked again - no glowing led...

I can't see an LED anywhere when I lift the front cover. If there is one, I can't see it light up when the hot tap is turned on...

The DHW has stopped working on my Biasi M90D.24S boiler. The boiler fires up and the CH works OK, but when I use the taps, the water runs tepid then goes cold - no hot at all. Any pointers? It would be helpful to know what I'd dealing with before I call out an engineer. Thanks