How to mend Glow-worm Spacesaver 50b Mk2

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

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Home heating systems?

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

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BMU error code?

How can I fix my glow worm flexicom 30cx ?

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

fitting thermostat?

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My radiators not heating up?

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

My central heating is not working?

Suprima 50?

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

boiler Glow-worm30cxi 30cxi not working?

glow worm 24cxi boiler?

Central heating not working?

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

How to fix glow worm 18 hxi ?