7.TROUBLE SHOOTING
13
the compressor
overload
protector
operate
1. The wiring of the overload protector
connect loose
2. The overload protector is failure
3. The refrigerant is not enough;
4. The installation pipe is too long than
normal, but not add the enough refrigerant;
5. The expansion valve is failure;
6. The outdoor control board is failure
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
operate or the
unit turn off for
high pressure
protection
1.The wiring of the high pressure protector
connect loose;
2.The high pressure protector is failure;
3.The outdoor control board is abnormal;
4. Overload in cooling;
5. Overload in heating.
1.Reconnect the wiring 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.
16
overload
protection in
cooling mode
System overload Please refer to the Note 3.
17
the discharge
temperature
sensor fault
1.The wiring of the discharge temperature
sensor connect loose;
2.The discharge temperature sensor is
failure;
3.The sampling circuit is abnormal
1.Reconnect the wiring of the
discharge temperature sensor;
2.Replace the discharge temperature
sensor;
3.Replace the outdoor control board.
18
AC voltage is
abnormal
1.The AC voltage>275V or <160V.
2.The AC voltage of sampling circuit on the
drive board is abnormally
1. Normally protection, please check
the supply power;
2. Replace the drive board.
19
the suction
temperature
sensor fault
1.The wiring of the suction temperature
sensor connect loose;
2. The suction temperature sensor is failure;
3. The sampling circuit is abnormally
1.Reconnect the wiring of the suction
temperature sensor;
2.Replace the suction temperature
sensor;
3.Replace the outdoor control board.
22
the defrosting
sensor fault
1.The wiring of the defrosting sensor
connect loose;
2.The defrosting sensor is failure;
3.The sampling circuit is abnormally
1. Reconnect the wiring of the
defrosting sensor;
2. Replace the defrosting sensor;
3. Replace the outdoor control board.
23
the sensor for
the expansion
valve A(thin
tube) fault
1. The wiring of the sensor for the expansion
valve A(thin tube) connect loose;
2.The sensor for the expansion A(thin tube)
is failure;
3. The sampling circuit is abnormally
1. Reconnect the wiring of the sensor
for the expansion valve A(thin tube);
2. Replace the sensor for the
expansion valve A(thin tube);
3. Replace the outdoor control board.
24
the sensor for
the expansion
valve B(thin
tube) fault
1. The wiring of the sensor for the expansion
valve B（thin tube） connect loose;
2.The sensor for the expansion valve B(thin
tube) is failure;
3.The sampling circuit is abnormally
1.Reconnect the wiring of the sensor
for the expansion valve B(thin tube);
2.Replace the sensor for the
expansion valve B(thin tube);
3. Replace the outdoor control board.
25
the sensor of the
expansion valve
C （ thin tube ）
fault
1. The wiring of the sensor for the expansion
valve C(thin tube) connect loose;
2.The sensor of the expansion valve C（thin
tube）is failure;
3.The sampling circuit is abnormally
1. Reconnect the wiring of the sensor
for the expansion valve C(thin tube);
2. Replace the sensor for the
expansion valve C(thin tube);
3. Replace the outdoor control board.
26
the sensor of the
expansion valve
D （ thin tube ）
1.The wiring of the sensor for the expansion
valve D(thin tube) connect loose;
2.The sensor of the expansion valve D（thin
1. Reconnect the wiring of the sensor
for the expansion valve D(thin tube);
2. Replace the sensor for the
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