E6‖ Communication Error - Gree GUD35W/NhA-T Service Manual

GREE
Troubleshooting：
3.4.5 ―E6‖ Communication Error
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display
Error judgment condition and method:
If no communication between ODU and IDU or between IDU and wired controller in continuously 120s, this error will be
reported.
Possible reason:
■Communication wire is connected improperly or loose.
■Communication wire is cut off
■Communication wire is in poor connection
E4 Compressor air discharge high -
temperature protection
Confirm the specific outdoor unit `s
protection module and compressor
Restart the unit and check if the
discharge temperature of the failing
compressor is equal to or higher than
115 ℃
Yes
Check if the electronic expansion valve
of the subcooler is connected to the
main board correctly
Yes
Does the indoor unit ` s capacity match
that of the outdoor unit ?
Yes
Does the environmental
temperature of the exceed the
permitted scope of temperature of the
unit
No
1.Check the system `s refrigerant pipe for
any leak and add refrigerant
2.Check if the pipeline is jammed
U-Match 5 SERIES UNIT SERVICE MANUAL
Replace the temperature sensor
No
Is the discharge temperature sensor `s
resistance normal ?
Replace the main board of the outdoor
unit
No
Reconnect the electronic expansion valve
of the subcooler
No
Check rating capacities of the indoor and
outdoor units again
Yes
Check rating capacities of the indoor and
outdoor units again
45
No
Yes
E6