There is no magic reset procedure for fixing electronic control boards. Sometimes turning the power off & removing plug from wall socket for several minutes will allow the board to start from scratch if it has been upset by something but doesn't work every time. Pressing fabric care & the power on will only put you in to the machine size setting mode nothing to do with any reset. So you were given wrong advice there. If you recently had a new display board fitted it should be covered by warranty. Take the problem back to the person who fitted it. Any attempt by you to repair it yourself may cancel the warranty.
Lincoln Appliance NZ, December 2009