Gree GWHD(18)NK3FO, Service Manual

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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.
Malfunction status sheet
Malfunction name Malfunction type Nixie tube
Zero cross detection circuit malfunction Hardware malfunction U8
Malfunction protection of jumper cap Hardware malfunction C5
Feedback of without IDU motor Hardware malfunction H6
Indoor ambient temperature sensor is open/short circuited Hardware malfunction F1
Indoor evaporator temperature sensor is open/short circuited Hardware malfunction F2
Liquid valve temperature sensor is open/short circuited Hardware malfunction b5
Gas valve temperature sensor is open/short circuited Hardware malfunction b7
Modular temperature sensor is open/short circuited Hardware malfunction P7
Outdoor ambient temperature sensor is open/short circuited Hardware malfunction F4
Outdoor condenser inlet pipe temperature sensor is
open/short circuited (commercial)
Hardware malfunction A5
Outdoor condenser middle pipe temperature sensor is
open/short circuited
Hardware malfunction F4
Outdoor condenser outlet pipe temperature sensor is
open/short circuited (commercial)
Hardware malfunction A7
Outdoor discharge temperature sensor is open/short
circuited
Hardware malfunction F5
Communication malfunction Hardware malfunction E6
Malfunction of phase current detection circuit for compressor Hardware malfunction U1
Compressor demagnetization protection
Viewing malfunction code
through remote controller within
200s; displayed directly on
nixietube after 200s
HE
Malfunction of voltage dropping for DC bus-bar U3
Module high temperature protection P8
Refrigerant lacking or blockage protection of system (not
available for residential ODU)
F0
Charging malfunction of capacitor Hardware malfunction PU
High pressure protection of system Hardware malfunction E1
Low pressure protection of system (reserved) Hardware malfunction E3