CONNECT SERIES SERVICE MANUAL
30
ENGLISH
Troubleshooting
Yes
Yes
Yes
No
Yes No
Yes
No
No
No
Replace the
temperature
sensor
Replace the
main board of
the outdoor
unit
Reconnect
the electronic
expansion
valve of the
subccoler
Check rating
capacities of
the indoor
and outdoor
units again
Check rating
capacities of
the indoor
and outdoor
units again
1.Check the systems
refrigerant pipe for any
leak and add refrigerant
2.Check if the pipeline is
jammed
Start
“E4” Compressor Air Discharge High-
Temperature Protection
Error display:
ODU main board LED display
Error judgment condition and
method:
Test the compressor discharge
temperature through compressor
discharge pipe and compressor shell
top temperature sensor. If the tested
temperature value is higher than 239°F,
the unit will stop for protection.
Possible causes:
• Service valve of ODU is not fully
opened
• Electronic expansion valve is abnormal
• Outdoor or indoor fan is not working
properly
• IDU filter or air duct is blocked (cooling
mode)
• Ambient temperature exceeds
allowable operation range
• System is under charged
• Refrigerant lines are blocked
E4 Compressor
air discharge high
temperature protection
Confirm the specific
outdoor unit protection
module and compressor
Restart the unit and check if the discharge
temperature of the failing compressor is
equal to or higher than 239°F
Is the discharge
temperature sensors
resistance normal?
Check if the electronic
expansion valve
of the subcooler is
connected to the main
board correctly
Does the indoor
units capacity
match that of the
outdoor unit?
Does the
environmental
temperature of
the exceed the
permitted scope
of temperature of
the unit
