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About last July - used to be connected to a tank in loft (for some reason - prev owner) & was advised to connect it directly to mains water which I had done. No probs when switched over last Oct but now acting up.

When I turn on a hot tap my SIME boiler won't ignite & a red fault light comes on after 30 secs or so, after the pump/fan has sounded. Sometimes if I repeatedly open & close a hot tap before the red light comes on the boiler fires up & the temperature increases so I can have hot water...