How to mend Glow-worm Solaris 30c

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

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fitting thermostat?

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water from taps is boiling hot?

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

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Home heating systems?

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BMU error code?

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Suprima 50?

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How can I fix my glow worm flexicom 30cx ?

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Central heating not working?