34 
 
Current overload protection 
Outdoor ambient temperature sensor (T4 ) malfunction 
Condenser coil temperature sensor (T3) malfunction 
Compressor discharge temperature sensor (T5) malfunction 
Outdoor unit EEPROM parameter error 
Outdoor fan speed malfunction 
Indoor coil outlet pipe sensor(Located on outdoor unit low pressure 
valve) 
Communication malfunction between Cassette optional lift panel 
and the unit. 
Cassette optional lift panel malfunction 
Cassette optional lift panel not closed 
Inverter module (IPM) malfunction 
Over-voltage or under-voltage protection 
High temperature protection of compressor top(OLP)/ High 
temperature protection of IPM board 
Low ambient temperature protection 
Compressor drive malfunction 
Indoor units mode conflict 
★ flash ,  light, X extinguished 
7.3 Outdoor Unit Display 
7.3.1 Outdoor Unit Point Check Function 
A check switch is included on the outdoor PCB. 
Push SW1 to check the unit's status while running. The digital display shows the following codes each 
time the SW1 is pushed.