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Mend Glow-worm Ultra 30sxi Boiler Fault

I have a flashing F9 - what does that mean?

My Glow-worm Ultra 30sxi boiler has failed to start today and has a flashing F9 - can you advise what this means and how to fix it please.

Thanks

ShazzzyB
November 2010

Glow-worm Glow-worm Ultra 30sxi Heating, Home Heating Systems Boiler Fault Glowworm

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Glow-worm Ultra 30sxi: F9 Error - Fix It