Are you sure it is F90 and not F09 Kath? Also is your dryer a condenser dryer or vented out dryer. F09 is a common fault. Come back to me with model no and I can run through it with you. Model no is in doorway visible with door open, if not is on back of machine. Will be like WTE..??????..GB/.?? Cheers
Kenjo, May 2012