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 ℃
Is the discharge temperature sensor`s
resistance normal?
Replace the temperature sensor
Replace the main board of the outdoor
unit
Check if the electronic expansion valve
of the subcooler is connected to the
main board correctly
Does the indoor unit`s capacity match
that of the outdoor unit?
Does the environmental
temperature of the exceed the
permitted scope of temperature of the
unit
Reconnect the electronic expansion valve
of the subcooler
Check rating capacities of the indoor and
outdoor units again
Check rating capacities of the indoor and
outdoor units again
1.Check the system`s refrigerant pipe for
any leak and add refrigerant
2.Check if the pipeline is jammed
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
3.4.5 ―E6‖ Communication Error
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display E6
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
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