Saunier Duval Themaclassic F24E Combination Boiler

[bowerd2]

Hi -Boiler began fault by slow heating of hot water which became no hot water. Heating initially ok and then no heating. No red fault light illuminating which normally does when filling required so assume pressure ok. Electrics seem ok as boiler starting and sounding as normal but no life from the burner. Please tell me exactly what the fault is and how to rectify. Thanks a lot SD