Answer Hello Maria, There are only 5 components in this circuit. The electronic control, the thermal cutoff, the high limit thermostat, the heating element, and the centrifugal switch in the motor assembly. This is not counting the harness but it can also cause the issue. The most probable is the thermal cutoff, in which case you will need to correct the exhaust ducting since this causes the thermal cutoff to open. This is, of course, if 240Vac is properly provided to the unit for normal operation. Since the heating element is the only 240Vac part on the machine, I fone4 side of the breaker trips or one leg of 120Vac is not provided to the unit, there is a 50% chance that it will run with no heat. Also check the terminal block where the cord connects to the unit. Read More... Answered by AppliancePartsPros.com | Wednesday, December 31, 2014