The answer to 'my air filter won't turn on' is that the air filter is likely not properly connected or powered. This could be due to a tripped circuit breaker, a loose connection, or a problem with the air filter itself.
First, check the circuit breaker to make sure it has not been tripped. If the breaker is off, simply flip it back on. If the breaker trips again, there may be an electrical issue that requires the attention of a professional HVAC technician.
Next, inspect the air filter and its connections. Make sure the filter is properly seated in the filter housing and that all electrical connections are secure. If you notice any damage or wear on the filter or its components, you may need to replace the air filter.
If the air filter still won't turn on after checking the breaker and connections, there may be a more serious problem with the HVAC system that requires professional diagnosis and repair. In this case, it's best to call an experienced HVAC technician to inspect the system and determine the root cause of the issue.