The ribbon cable between the small display module and the main board is not quite connecting properly. Unplug your machine then find the cable that links the 2 modules in your machine - unplug them - nip them up with your fingers - and put them back on. There is a good chance this clears the F12. If not, could be your main module. See our site at www.emwelec.co.uk tel 0115 9652118 Tony EMW Electronics
EMW, October 2011
