How to mend Glow-worm Space-saver 38

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

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Home heating systems?

boiler Glow-worm30cxi 30cxi not working?

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BMU error code?

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

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What can I do about a Glow-worm Flexicom 30cx fault code F11?

fitting thermostat?

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Central heating not working?

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Which way to turn slotted screw to adjust water pressure up on a glow worm ?

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

how can i fix my central heating. Glow-worm ultimate?

My central heating is not working?

GS 24i junior boiler timer broken?

Suprima 50?

My radiators not heating up?

Intermittent boilet fails to fire on heating?

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

How can I fix my glow worm flexicom 30cx ?