When the controller displays malfunction,please turn off the unit to stop the malfunction display,ask for the professional to debug. Onida Air Conditioner Error Codes The meaning of error codes as shown in below: Error Codes Meaning E1 High pressure protection of compressor E2 Indoor anti-frozen protection E3 Low pressure protection of compressor E4 Discharge temp. protection of compressor E5 Compressor overload protection E6 Transmit malfunction E7 Modes conflict F0 Indoor environment temp. sensor mal-function F1 Indoor pan tube inlet tube temp. sensor malfunction F2 Indoor pan tube middle temp. sensor malfunction F3 Indoor pane tube outlet tube temp. sensor malfunction F4 Outdoor environment temp. sensor malfunction F5 Outdoor pan tube inlet tube temp. sensor malfunction F6 Outdoor pan tube middle temp. sensor malfunction F7 Outdoor pan tube outlet tube temp. sensor malfunction F8 Discharge temp. sensor 1 (rated frequency) malfunction F9 Discharge temp. sensor 2 (digital) malfu...