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Glow-worm Flexicom fault codes

7 codes from the Glow-worm manual for the Flexicom gas boiler. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
F1Boiler has attempted to light 5 times and failed on all occasions
F14Gas valve control defective
F4Flame goes out whilst lit during a demand
F77Condensate pump error (option)
S.30No heating demand from external controls 230V
S.36No heating demand from external controls 24V
S.97Water pressure sensor check is running, demand (DHW or heating) is blocked