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Glow worm (C30i) F5 flashing light?

Glow worm C30i combi gas boiler showing a red flashing light F5. No hot water & no heating. Tried re-setting, but the problem persists.
Kevin Johnson, March 2008
Theres a manual re-set inside combustion chamber, right hand side on the flow pipe, boiler must be off to remove this cover, use a small blunt instrument to gently push the small pin which sticks out, but do not force it. it will need a call by a quallified engineer as there is an underlying problem, with either pump, pcb or thermistor.

Boiler man, March 2008
I think this is the same fault as the vaillant pro 18 which is overheat, has the electric been off lately?

gary.wright53@googlemail.com, March 2008
link Click here to see other fixes for Glow-worm C30i.