The thermal fuse is NOT located on the circuit board. The thermal fuse should be 152 C fuse connected inline from the 12 volt connection to the heating tower and connected to reset switch.
Should be a sleeved slip on heat shield on the wire over the thermal fuse. If the thermo fuse trips, its gets weak...several trips it is done. Replace it. You need to order a new thermo fuse and re-wire it inline yourself