Air Conditioner Service Manual
37
11.4 System protection (E4)
When the unit operation, after 5 minutes, the system will check the temperature of the pipe, if the
temperature is at least 2
℃
less than before operation the system is normal, otherwise Freon short
of system and display E4.
11.5 System protection (E5) (High/low pressure protection model)
Start unit
Check the pressure of system
Check the resistance of pipe
sensor
Check the main PCB
Check leak place and add
the Freon
OK
OK
Replace the sensor
Replace the main PCB
Start unit
Check the pressure of system
Check hight/low pressure switch
Replace hight/low
pressure switch
Check PCB
Replace PCB
Check leak place and add
the Freon
OK
OK
