The answer to 'my air duct sealing won't turn on' is that there could be several common causes, such as a tripped circuit breaker, a faulty thermostat, or an issue with the air duct sealing system itself. Without power, the air duct sealing system won't be able to function.
If the air duct sealing system is not turning on, first check the circuit breaker to ensure it has not tripped. If the breaker is fine, then the issue may be with the thermostat or the air duct sealing system itself. You may need to troubleshoot the thermostat or call in a professional HVAC technician to diagnose and repair the air duct sealing system.