After the Air-con using season:
1.Choose a sunshine day, start the unit and set to FAN mode.
2.Running approx 2 hours. This can make the unit completely dry.
3.Turn off the unit and disconnect power supply.
4.Clean the air-filter, and cover the indoor unit with dust cover. Please the video:"How to clean air filter" in our website.(http://www.haier.com/pk/servicesupport/self_service/how_to/air_conditioner/wall_mounted/question/201605/t20160510_307575.shtml)
Note: generally the outdoor unit were installed at high place. If you want cover outdoor unit with dust cover, please be carefully, or you can ask service engineer do it.