The answer to 'why is my air filter not working' is that the air filter may be clogged, damaged, or improperly installed. A clogged air filter can restrict airflow and cause your HVAC system to work harder, leading to reduced efficiency and potential damage. Damaged or improperly installed filters can also allow dirt and debris to bypass the filter, reducing its effectiveness.
To troubleshoot, start by checking the air filter. Look for signs of dirt, dust, or debris buildup. If the filter is dirty, replace it with a new one. Make sure the new filter is the correct size and installed correctly. If the filter appears to be in good condition, check for any other issues, such as ductwork blockages or problems with the blower motor.