I have a glow worm 75 combi boiler that will not light, the pilot light & fan appear to be running fine but nothing happens when I turn on either DWH or CH other than the fan speeding up as normal. I guess the PCB am i correct??

Mike Ault, June 2007

The problem could be the pcb, but it could also be the air pressure switch. I believe the 75 does have one, although I know the 80 and 100 do not.
you can normally hear a click after the fan reaches its correct speed, this is the switch operating, although this does not rule out the contacts on the aps. this would have to be electrically tested.
hope this helps

gary.wright53@googlemail.com, June 2007