33
Installation and Maintenance
Service Manual
Malfunction display: E4 Compressor Exhaust High Temperature Protection
N
Y
Y
N
Y
Measure if compressor’s discharge
temperature has reached 115
℃
System pipeline leaks so complementation is needed.
Please add refrigerant according to the amount
specified in the nameplate
Measure if temperature sensor’s
resistance value is correct
Replace the outdoor
unit mainboard
Replace relevant discharge
temperature sensor
Discharge temperature protection
Malfunction display: E5 Compressor Overheat
N
Y
Y
Y
Y
Y
N
N
N
Check if compressor’s connection line is
properly connected
Adjust compressor’s connection line
Check if current value is higher than the protector’s setting
Replace overcurrent protector
If unit’s high pressure is normall
Refer to high pressure protection
If voltage is normal
Contact the power supply
company
Replace mainboard
Abnormal overcurrent
