Good afternoon Chris,
The Black Energy Xl has a safety switch beneath the facial cassette filter glass cover and a Thermal switch located above the facial cassette underneath the canopy cover. If either of these switches are open the unit will not operate. Check all the circuit breakers located in the unit base and also the flag switch that is connected to the main blower. If you need further assistance please contact the PC marketing customer support department at 1(800) 327-8826. We will be happy to answer any questions you may have. Thank you for choosing
UWE.
Korri Harris
Customer Support