4
Test Operation & Troubleshooting & Maintenance
3�2 Comp Low- pressure Protection E3
Comp Low-pressure Protection E3
Check if comp low-pressure switch
is broken or the wiring is loose.
Replace comp
low- pressure or rewire
Check if the fans stop running or reverse
Check the fans
Check if the system has leaked
Repair the leakage of system
pipe and add refrigerant
according to the required volume
yes
no
yes
no
no
3�3 Comp Discharge Temp Protection E4
Comp Discharge Temp Protection E4
Measure if the exhaust
temperature of compressor
reaches120
℃
Replace the corresponding
exhaust temperature
sensor
Check if the the electronic
expansion valve is blocked
Check if the system has leaked
The refrigerant of the system is
not enough and add refrigerant
according to the required volume
Repair the leakage of system
pipe and add refrigerant
according to the required volume
yes
yes
no
yes
Measure if the
resistance of temperature
sensor is correct
Replace the mainboard
of AP2
no
no
yes
Replace the electronic
expansion valve
Summary of Contents for Versati II Series
Page 18: ......
