![Messana App ATU Dirty Filter Alarm](https://2992f67e.rocketcdn.me/wp-content/uploads/2024/05/8056e8dd.jpg)
If a system has a Dirty Filter alarm on, it may be time to clean or replace the Air Unit filter.
To properly clean the air unit’s filter, use a vacuum or air compressor to vacuum or blow the debris from the filter.
For Messana Air Units, only replace the filter if obvious signs of deterioration are present.
How to reset the Dirty Filter Alarm:
After cleaning and re-installing the filters, you will need to reset the Dirty Filter alarm which is time-based.
To do that you will need to navigate to:
- Main menu
![Messana App Main Menu](https://2992f67e.rocketcdn.me/wp-content/uploads/2024/05/3a7aa7f0.jpg)
- Systems
![Messana App Systems Page](https://2992f67e.rocketcdn.me/wp-content/uploads/2024/05/25586b2c.jpg)
- Air Units
![Messana App Air Units Page](https://2992f67e.rocketcdn.me/wp-content/uploads/2024/05/c1489be3.jpg)
- Click on the Air Unit that you want to reset the alarm for which will expand the units individual menu.
![Messana App Air Unit Settings Page](https://2992f67e.rocketcdn.me/wp-content/uploads/2024/05/9bb26310.jpg)
- Scroll down to the last menu option for that air unit which will read Dirty Filter.
![Messana App ATU Settings Page](https://2992f67e.rocketcdn.me/wp-content/uploads/2024/05/735e11bd.jpg)
- Click on it to expand the menu and click the reset button.
![Messana App Air Unit Dirty Filter Page](https://2992f67e.rocketcdn.me/wp-content/uploads/2024/05/6ae74398.jpg)
If the filters were not very dirty or too dirty, you can increase or decrease the Filter cleaning interval accordingly.
For more details regarding Messana Air Units, you may refer to our product user manuals.