Gree Multi21 Series Owner's Manual page 22

DIAGNOSTIC CODES
Malfunction Name
High Temperature
Resistant Protection
Cold Air Protection
EEPROM Memory Malfunction
Module Phase Current Protection -
Frequency Decrease/Limit Mode
Module Temperature Protection -
Frequency Decrease/Limit Mode
Refrigerant Leakage Protection
Indoor Ambient Temperature
Sensor Malfunction
Indoor Coil Temperature
Sensor Malfunction
Outdoor Ambient Temperature
Sensor Malfunction
Outdoor Coil Temperature
Sensor Malfunction
Outdoor Discharge Temperature
Sensor Malfunction
Compressor Overload Protection -
Frequency Decrease/Limit Mode
Oil Return Protection - Frequency
Decrease/Limit Mode
System Current Overload Protection -
Frequency Decrease/Limit Mode
Outdoor Unit Indicators
Indoor Unit
Display
Yellow
E8 6 flashes
and 1 sec Off
E9
EE 11 flashes
and 1 sec Off
En
EU
and 1 sec Off
F0
and 1 sec Off
F1
F2
F3
and 1 sec Off
F4
and 1 sec Off
F5
and 1 sec Off
F6
and 1 sec Off
F7
F8
and 1 sec Off
Possible Causes
Red
1) Incorrect refrigerant charge level
2) Refrigerant metering device malfunction
3) Compressor malfunction
1) Indoor coil has not reach minimum heating temperature
2) Indoor ambient is abnormally cold
3) Indoor control board malfunction
Control board malfunction
Outdoor control board malfunction
11 flashes 1) IPM module over heating or malfunctioning
2) Improper voltage at IPM Module
9 flashes 1) refrigerant leak(s)
2) Indoor coil temperature sensor no calibrated
3) Refrigerant flow is restricted ( ex. valve, exv, debris)
1) Loose or bad connection between sensor and control board
2) Indoor ambient temperature sensor damaged
3) Control board malfunction
1) Loose or bad connection between sensor and control board
2) Indoor coil temperature sensor damaged
3) Control board malfunction
6 flashes 1) Loose or bad connection between sensor and control board
2) Outdoor ambient temperature sensor damaged
3) Control board malfunction
5 flashes 1) Loose or bad connection between sensor and control board
2) Outdoor coil temperature sensor damaged
3) Control board malfunction
7 flashes 1) Loose or bad connection between sensor and control board
2) Discharge temperature sensor damaged
3) Control board malfunction
3 flashes 1) Incorrect refrigerant charge
2) Metering device malfunction
3) Compressor malfunction
Normal function status code only
1 flashes 1) Input voltage too low
2) System pressure too low
21