Gree GWHD(18)NK3FO Service Manual page 32

1. Requirement of malfunction display
When several malfunctions happen at the same time, malfunction codes will be displayed circularly.
2. Malfunction display method
(1) Hardware malfunction: it will be displayed immediately, please refer to "Malfunction status sheet";
(2) Operation status: it will be displayed immediately, please refer to "Malfunction status sheet";
(3) Other malfunction: It will be displayed after the compressor has been stopped for 200s, please refer to "Malfunction
status sheet".
(Note: when the compressor starts up again, malfunction display waiting time (200s) will be cleared.)
3. Malfunction display control
Indoor unit displays malfunction code as shown in the sheet below. ODU communication light will be off for 1s and then blink
for 1s circularly.
4. Viewing malfunction code through remote controller
Enter viewing malfunction code: pressing light button for 6 times within 3S to view malfunction code;
Exit viewing malfunction code: pressing light button for 6 times within 3S or after the malfunction code is displayed for 5min.
Zero cross detection circuit malfunction
Malfunction protection of jumper cap
Feedback of without IDU motor
Indoor ambient temperature sensor is open/short circuited
Indoor evaporator temperature sensor is open/short circuited
Liquid valve temperature sensor is open/short circuited
Gas valve temperature sensor is open/short circuited
Modular temperature sensor is open/short circuited
Outdoor ambient temperature sensor is open/short circuited
Outdoor condenser inlet pipe temperature sensor is
open/short circuited (commercial)
Outdoor condenser middle pipe temperature sensor is
open/short circuited
Outdoor condenser outlet pipe temperature sensor is
open/short circuited (commercial)
Outdoor discharge temperature sensor is open/short
circuited
Communication malfunction
Malfunction of phase current detection circuit for compressor
Compressor demagnetization protection
Malfunction of voltage dropping for DC bus-bar
Module high temperature protection
Refrigerant lacking or blockage protection of system (not
available for residential ODU)
Charging malfunction of capacitor
High pressure protection of system
Low pressure protection of system (reserved)
Malfunction status sheet
Malfunction name Malfunction type
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Viewing malfunction code
through remote controller within
200s; displayed directly on
nixietube after 200s
Hardware malfunction
Hardware malfunction
Hardware malfunction
Nixie tube
U8
C5
H6
F1
F2
b5
b7
P7
F4
A5
F4
A7
F5
E6
U1
HE
U3
P8
F0
PU
E1
E3