on my hotpoint wd420p it keeps coming up f1 ?

I have a hotpoint wd420p and i keep getting high hest dry light and start light flashing with the dryer fan running iv been told its fault 1 ans is the relay on the power module iv got it apart and im a electronics enginner and can replace the relay but need to know what one it is ? or were i can get the schematics for this board.?? Any help will be greatfull..