How to mend Glow-worm Performa 24eco He

I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?

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My central heating is not working?

Central heating not working?

Is it normal that the flame is burning all the time?

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My radiators not heating up?

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Home heating systems?

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boiler Glow-worm30cxi 30cxi not working?

I have moved into a flat am dissabled carnt get heating on unit flashing F1?

what causes the sabre he 25 to come on, on its own?

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How can I fix my glow worm flexicom 30cx ?