Gree Multi21 Series Owner's Manual page 23

DIAGNOSTIC CODES
Malfunction Name
High Compressor Discharge
Temperature - Frequency
Decrease/Limit Mode
Indoor Coil Freeze Protection -
Frequency Decrease/Limit Mode
Pump Down or Gathering
Refrigerant Status
Defrost Mode in Heating
Compressor Overload Protection
IPM Module Protection
Indoor DC Fan Motor
Malfunction
Compressor De-Synchronized
Malfunction
Power Factor Correction (PFC)
Protection
Compressor Demagnetization
Protection
High Input Power Protection
Start-Up Malfunction
Compressor phase-lacking/
phase-inverse protection
Outdoor Unit Indicators
Indoor Unit
Display
Yellow
F9 2 flashes and
1 sec Off and 1 sec Off
FH
Fo 17 flashes
and 1 sec Off
H1
H3 8 flashes
and 1 sec Off
H5 4 flashes
and 1 sec Off
H6
H7
HC 14 flashes
and 1 sec Off
HE
L9 9 flashes
and 1 sec Off
LC
Ld
Possible Causes
Red
4 flashes 1) Cooling load is too great
2) Outdoor ambient temperature too high
3) Refrigerant charge too low
4) Metering device malfunction
1) Indoor coil has not reach minimum heating temperature
2) Indoor ambient is abnormally cold
3) Indoor control board malfunction
Optional Service Mode
Operation status
1) Wiring terminal OVC-COMP is loose
2) Refer to the malfunction analysis in Service Manual
1) IPM module over heating
2) Improper or Low voltage at the IPM module
3) IPM module malfunction
1) Loose connections between fan motor and control board
2) Fan motor or blower wheel bearings malfunction
3) Control board malfunction
1) Compressor voltage is not balance
2) Control board malfunction
3) Compressor malfunction
1) Mis-wiring of the reactor filter and PFC capacitor
2) Reactor filter or PFC capacitor malfunction
3) Control board malfunction
Compressor malfunction
1) Compressor malfunction
2) Power circuit malfunction
1) Over charged with refrigerant
2) Control board malfunction
3) Compressor malefaction
Hardware malfunction
22