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f5 flashing?

I am getting f5 problem with no hot water or heating
Martin Rose, July 2012
F5 fault
could be...
...ferroli boiler > FAN
or
...glowworm boiler > OVERHEATING
or
...viessman boiler > FLAPPER VALVE ON FAN
or
...british gas 330 boiler > OVERHEATING

just take your pick from above

AWOL, July 2012