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4. Troubleshooting check table
AO20R / 24R (2-ROOM)
Trouble and protection indicate (Indoor unit)
Operation lamp : Red lamp
: 0.1s ON/OFF repeated
LED Indication
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Red lamp
Green lamp
Trouble and protection indicate (Outdoor unit)
: 0.1s ON/OFF repeated
LED Indication
D8
D15
( 2 times )
D10
( 3 times )
( 4 times )
( 5 times )
( 6 times )
D17
( 2 times )
D9
( 3 times )
( 4 times )
( 5 times )
3s ON/1s OFF repeated
( 2 times )
D16
( 3 times )
( 4 times )
( 5 times )
3s ON/1s OFF repeated
Timer lamp : Green lamp
: 0.5s ON/OFF repeated
(2 times)
Indoor unit Thermistor (room temp.) error
(3 times)
Indoor Thermistor (heat exchanger) error
(4 times)
Signal reception (from outdoor unit) error
(6 times)
Indoor unit Fan motor lock protection
Outdoor unit Thermistor (discharge pipe) A error
(1 time)
Outdoor unit Thermistor (discharge pipe) B error
(2 times)
Outdoor unit Thermistor (heat exchanger) A error
(3 times)
Outdoor unit Thermistor (heat exchanger) B error
(4 times)
Outdoor unit Thermistor (outdoor temp.) error
(5 times)
Outdoor unit pressure SW A error
(6 times)
Outdoor unit pressure SW B error
(7 times)
Outdoor unit model information error
(8 times)
Outdoor unit EEP ROM error
(9 times)
: 0.5s ON/OFF repeated
Signal reception ( from indoor unit A ) error
Pressure SW A error
Signal reception ( from indoor unit B ) error
Pressure SW B error
Thermistor (discharge pipe) A error
Thermistor (discharge pipe) B error
Thermistor (heat exchanger) A error
Thermistor (heat exchanger) B error
Thermistor ( outdoor temp. ) error
Not applied
Heating overload protection
Cooling deicing
Over pressure protection
Discharge temp. protection
Heating defrost operation
Heating overload protection
Cooling deicing
Over pressure protection
Discharge temp. protection
Heating defrost operation
Error contents
Error contents
– 18 –
Model
information
error
0.1s ON/OFF
(All LED blink)
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