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fault showing glowworm 30cxi?

I have had a glow worm combi boiler now for over a year now and have not had any promblems till now I have had a fault F25 show up how can I fix it someone has surgested bleeding the rads will cure it any further idears?
Simon, January 2011
Gas safe engineer = job creation scheme !

Thermistors are not part of the Gas Safe criteria

gba, January 2011
check manual or go to website to find fault with code

k, January 2011
Bleeding the rads should cure it..If not then you need the heating flow and return thermisters checking...This needs checking by a Gas safe engineer..

Steve, January 2011