Potterton Suprima 60 faults?

I recently moved in to a house that has a Potterton Suprima 60 Boiler, we have had numerous problems with it and believe that we need to change the PCB.

After going away for 2 weeks recently we got back to find that the boiler does not come on at all, the green light is on constantly and the red one keeps flashing.

I have tried turning the machine off and when I did both lights come on then shortly afterwards the red one goes off and the green starts flashing, the boiler also starts to make a humming noise.

I cant see any kind of pilot flame through the small window on the frnt of the boiler but not sure if it would have one all the time.

Any help would be really helpful....

Thanks
Rob