Please follow the steps given below if the Air Purifier display shows an exclamation symbol within a triangle:
1. Switch Off the Air Purifier and unplug the power adapter
2. If the "exclamation symbol within a triangle" still pops up in the LCD display, please clean the tungsten wires located inside the body of the device with a clean tissue or soft cloth.
3. Also, please clean the filter using the rubber bat that is provided, by gently running it up and down the insides of the filter to clean it.
Once the above cleaning is down, place the filter securely back inside the device now re-plug the adapter into the power socket and switch it On.