There's a problem with the heating circuit.You will have to test the heating element and the thermostats.The easiest way to check these components is with a multimeter on the continuity setting.Any with open circuits is a indication that the components have faild.Take off the bulged cover at the back and take out the heater element. On top there you will see the thermostats. With a multimeter you need to meter out the thermostats. If any are open circuit then look in the middle of the thermostat on the left and if theres a hole in the middle of it get a pin and push it into the thermostat and push down. This will reset the thermostat,you should hear a click!!.....that's the stat resetting.
paul
January 2012