Gree GWHD(18)NK3FO Service Manual page 33

Compressor overload protection
Indoor unit and outdoor unit do not match
Malfunction of memory chip
Wrong connection of communication wire or malfunction of
electronic expansion valve
Malfunction of complete units current detection
Malfunction protection of outdoor fan 1
Detection status of wrong connection of communication wire
or malfunction of electronic expansion valve
Mode conflict
Refrigerant recycling mode
X-fan
Defrosting or oil return in heating mode
Start failure of compressor
High discharge temperature protection of compressor
Overload protection
Whole unit overcurrent protection
Compressor phase current protection
Compressor desynchronizing
Compressor phase-lacking/phase-inverse protection
IPM modular protection
DC bus-bar low voltage protection
DC bus-bar high voltage protection
PFC protection
The four-way valve is abnormal
1. IPM protection malfunction
Main checking point:
If the input voltage of the unit is within normal range?
If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
Viewing malfunction code
through remote controller within
200s; displayed directly on
nixietube after 200s
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Operation status
Operation status
Operation status
Operation status
Operation status
Viewing malfunction code
through remote controller within
200s; displayed directly on
nixietube after 200s
H3
LP
EE
dn
U5
L3
dd
E7
Fo
AL
H1
Lc
E4
E8
E5
P5
H7
Ld
H5
PL
PH
HC
U7