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 a problem with the air duct sealing system itself. Symptoms may include no airflow, poor temperature regulation, or strange noises coming from the vents.
For a simple issue like a tripped breaker, you may be able to reset it yourself. However, if the problem persists or you're unsure of the cause, it's best to call a professional HVAC technician to diagnose and repair the issue. They have the expertise to properly inspect the system and make any necessary repairs or adjustments.