5
9
5
8
Troubleshooting
Troubleshooting
Diagram
9
Diagram 1
0
(5) Compressor non-synchronism protection(L0)
Main checking points:
ƽ
If the pressure of the system is too high;
ƽ
If the eletric expansion valve is working normally or it is broken;
ƽ
If the radiation of the unit is good;
Flow chart:
Eliminate the malfunction
Eliminate the malfunction
Eliminate the malfunction
Replace the compressor
End
no
no
no
no
no
no
yes
yes
yes
yes
yes
yes
Replace outdoor mainboard
The unit appears non-synchronism
as soon as energizing and starting
The stop duration of the compressor is longer
than 3min?
The wiring of the compressor is
connected properly?
Reconnect the wire properly
The eletric expansion valve is broken?
Replace the eletric
expansion valve
(6) Compressor start failure protection
（L1)
Main checking points:
ƽ
If the connection wire of the compressor is connected properly;
Flow chart:
ƽ
If the stop duration of the compressor is sufficient;
ƽ
If the compressor is broken;
ƽ
;
If the refrigerant charging amount is too much;
Energize and
start the unit
If the stop duration of the compressor
is longer than 3min
no
no
no
no
yes
yes
yes
yes
yes
yes
If the connection wire of the compressor
is connected well and correctly
Eliminate the malfunction
Reconnect the connection wire
of the compressor according
to the wiring diagram
If the refrigerant charging
amount is too much
Charge the refrigerant
according to the
service manual
Eliminate the malfunction
Eliminate the malfunction
no
Replace the compressor
End
no
Replace the outdoor
mainboard
The stop duration of the unit is
not enough, the high and low
pressure of the system is not
balanced,restart it after 3min
