you will have to inspect the heating element.remove the kidney shaped panel on the rear of the appliance,unplug the wiring to the heater,power the appliance up and see if it trips the power .if it doesn't ,inspect the heating element for moisture ,you may have to remove for full inspection,the element may also have faild.test the element for short circuit.if the appliance still trips on the disconnection of the element,you will have to check all wiring and stat for short circuit.make sure you pull the plug before you take the rear panel off.
mech monster, November 2011