Central heating and hot water both are not working. The display code F1 is Seen. As per manual following faults are listed.
A Faulty Fan
B Faulty electrode and electrode sencer
C Faulty ignition Module
D Faulty thermister

How can I check Above parts?

Raman Mistry, April 2006

on the overheat thermostat there is a very small reset button between the two connectors"
i have same prob and i just cannot find the reset button could somebody please help me understand where it is ive looked all over lol thank you all take care and i hope u all get urs sorted

james, August 2008

on the overheat thermostat there is a very small reaset button between the two connectors

peter shepp, July 2008

In the manual you should find a tree diagram or flow chart. Look at it to see the sequence that things should occur in.
Usually - after checking water pressure &... - the fan starts. IF the fan is too slow (as detected by an air flow sensor) then it cuts out. Hence fault A. Is the fan spinning?
If it "clicks" but no flame - or flame but for only a few seconds - B or C
I think D is not likely - as usually means temp control is out for hot water or heating - I think there are separate thermistors....
Good luck - I suggest you phone Potterton & get them to reccomend an engineer to fix it - if you don't get far...

Raphael Lytton, April 2006