What is the air conditioning display F?

This code indicates a refrigerant leak or a blocked system. Cause: The old air conditioner that has been used for a long time or the air conditioner that has been moved recently was installed incorrectly, which caused the air conditioner to be damaged, resulting in refrigerant leakage or system blockage. Solution: Repair refrigerant leakage, add refrigerant again, and clean the air conditioning system. Air-conditioning maintenance: remove the debris from the vent to ensure normal ventilation. Observe whether the outdoor rack is loose, and clean the outdoor ventilation net cover for foreign objects. At the same time, keep the vents open. Clean the surfaces of indoor and outdoor heat exchangers to improve the efficiency of heat exchangers. When cleaning the indoor heat exchanger, carefully remove the panel, scrub it with a soft rag, and gently scrub the heat exchanger of the indoor unit with a small brush to remove the harmful accumulation of dust and breeding bacteria. Remove the dust from the filter screen. When cleaning the filter screen, cut off the power supply first, and then open the air intake grille; Take out the filter screen, clean the filter screen with water or vacuum cleaner, the water temperature should not exceed 40 degrees, clean it with hot wet cloth or neutral detergent, and then wipe it with dry cloth. At the same time, it is not allowed to clean the filter screen with pesticides or other chemical cleaners.