Fault code 60 ( as long as that is the only led that is flashing ) is an ionisation pcb fault. PCB's are available from several sources - internet or local heating engineers... but it might be worth checking the ionisation electrode ( flame detector ) first. This is in the bottom left-hand side of the burner compartment, just above the burners... if it is damaged it can create strange symptoms.
J.R. Copley
May 2009