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    SIME Super 90 Mk2 - not firing up for hot water/CH

    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...
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