Service & Parts Manual (2019, 2020, 2021, 2022)

239 PB
TROUBLESHOOTING
Outdoor Fault Codes
Fault code Fault description Possible reasons for
abnormality
How to deal with Remarks
7 The communication
fault between the indoor
unit and outdoor unit
"1.The connection cable
is connected improperly
between the indoor unit
and outdoor unit;
2.The communication
cable is
connected loosely;
3.The communication
cable fails; 4.The
indoor control board
fails; 5.The outdoor
control board fails;
6.Communication
circuit fuse open; 7.The
specification of
communication cable is
incorrect."
"1.Reconnect the
connection cable
referring to the wiring
diagram;
2.Reconnect the
communication cable;
3.Replace the
communication cable;
4.Replace the indoor
control board;
5.Replace the outdoor
control board;
6.Check the
communication circuit,
adjust the DIP switch
and the short-circuit
fuse.
7.Choose suitable
communication cable
referring to the user
manual"
13 Compressor overheat
protector device
"1. The wiring of the
overload protector is
connected loosely.
2. The overload
protector fails .
3. The refrigerant is not
enough;
4. The installation pipe
is much longer than
the normal one, but
extra refrigerant is not
added ;
5. The expansion valve
fails;
6. The outdoor control
board fails."
"1. Reconnect the
wiring of the overload
protector;
2. Replace the overload
protector;
3. Check the welding
point of the unit to
confirm whether
it is leakage, and
then recharge the
refrigerant;
4. Add the refrigerant;
5. Replace expansion
valve;
6. Replace the outdoor
control board."
14 The high pressure
switch operation or
the unit is turned off
for high pressure
protection
"1.The wiring of the high
pressure protector is
connected loosely;
2.The high pressure
protector
fails
3.The outdoor control
board is abnormal;
4. Overload in cooling;
5. Overload in heating."
"1. Reconnect the wiring
of the high pressure
protector;
2. Replace the high
pressure protector;
3. Replace the outdoor
control board;
4. Please refer to the
Note 3;
5. Please refer to the
Note 4."
Applied to models with
high pressure switch or
pressure sensor
16 Overload protection in
cooling mode
System overload Please refer to the Note
3.
17 Discharge temperature
sensor fault
"1.The wiring of the
discharge temperature
sensor is connected
loosely;
2.The discharge
temperature sensor
fails;
3.The sampling circuit is
abnormal."
"1. Reconnect the
wiring of the discharge
temperature sensor;
2. Replace the
discharge temperature
sensor fails;
3. The sampling circuit
is abnormal."