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problem with the boiler?

i have a glow worm330 boiler, it is displaying F5 and a light is flashing red, what could be the problem?

amjad ali
August 2008
It has overheated, Is your pump running?? mind you it wont in overheat state, consult the book or get bg out to sort it for you.

the Ahre
August 2008

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