The Blue light and the reset light are both flashing. I have held the reset button down for two seconds and the boiler attempts to restart, the Burner indicator is green and water is going into it. However once it completes the restart, it stays on for about 2 secs and then tries to restart itself again. It will go through this 3-4 times and then the blue light and reset button start to flash again.
It would seem as if this problem started in the last couple of hours when I walked into the house it was colder than expected so I felt the heaters and they were still warm.
The pressure is between 1 and 1.5 so not sure if that has anything to do with it.
Any help would be appreciated.

Mal, December 2010

To CMac and Mo, thank you so much for your help. I checked the condensate trap, cleaned it out, and so far all is working well.

Much appreciated.

Mal, December 2010

Also look at the condensate trap/pipework - prone to blocking and would prevent the boiler from firing.

If you can get the front (main) casing off you'll see the condensate trap lower left (has a 3/4" dia white plastic pipe connected to underside).

Is it full of water? If so it's blocked - Fairly easy to remove and empty/clean-out.

Good luck!

CMac, December 2010

Thanks for that, I will try to get the parts and give it a go.

Mal, December 2010

try to change the flu overheat stat , heatcontrol and the heatexchange overheat stat as well
it will cost you about £50.00

moe, December 2010