F5 is thermostat cut out , the reset button should be depressed the cause however should be diagnosed first could simply be not enough pressure However you should not have heating or hot water.
Do you just have heating then
mickey
April 2009
I can answer this question...
Glow worm 24cxi no hot water, what is fault code F5?
howtomendit.com for free repair help, information and advice.
