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F4 fault showing on my Glow worm 30cxi boiler?

F4 fault showing on my Glow worm 30cxi boiler. When I turn the system off and back on again it resolves until the nex time. Why does this continue to happen?
Frustrated in Belfast, November 2013
F4
ignition fault
would need to check each component listed in fault finding section to find defective part

Q, November 2013