why does my glow worm boiler give f5 code and cut off when i increase the temper

Apr 17, 2015 0 Replies

I have a glow worm 30 hxi boiler which from new has always cut out and displayed code f5 if I increase the temp on the boiler above 65 degrees. It runs fine up to 65 and is in a system supplying hot water to a tank and several radiators.


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