Pioneer YH1824GHFD18R2 Technical & Service Manual page 59

14. TROUBLESHOOTING
Fault
Fault description
code
Compressor overheat
13
protector device
The high pressure
switch operation or
14 the unit is turned off
for high pressure
protection
The low pressure
switch protection or
15
the unit is turned off
for low pressure
protection
Overload protection
16
in cooling mode
Discharge
17 temperature sensor
fault
AC voltage is
18
abnormal
Suction temperature
19
sensor fault
The defrosting sensor
22
fault
High Pressure sensor
43
fault
Possible reasons for abnormality
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. 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. The wiring of the low pressure
switch is connected loosely;
2. The low pressure switch fails;
3. The refrigerant is not enough;
4. The expansion valve fails in
heating mode;
5. The outdoor control board is
abnormal.
System overload
1.The wiring of the discharge
tempe-rature sensor is connected
loosely;
2. The discharge temperature
sensor fails;
3.The sampling circuit is abnormal.
1.The AC voltage>275V or <160V;
2.The AC voltage of sampling circuit
on the driver board is abnormal.
1.The wiring of the suction tempe-
rature sensor is connected loosely;
2.The suction temperature sensor
fails;
3.The sampling circuit is abnormal.
1.The wiring of the defrosting sensor
is connected loosely;
2.The defrosting sensor fails;
3.The sampling circuit is abnormal.
1. The wiring of the high-pressure
pressure sensor connect is loose;
2. The high-pressure pressure
sensor fails；
3. The sampling circuit of the high-
pressure pressure sensor fails.
How to deal with
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.
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 NOTE 3;
5. Please refer to NOTE 4.
1. Reconnect the wiring of the
low pressure switch;
2. Replace the low pressure
switch;
3. Check the welding point to
confirm whether the unit leaks,
and add some refrigerant;
4. Replace the expansion valve;
5. Replace the outdoor control
board.
Please refer to NOTE 3.
1. Reconnect the wiring of the
discharge temperature sensor;
2. Replace the discharge
temperature sensor;
3. Replace the outdoor control
board.
1. Normal protection, please
check the supply power;
2. Replace the driver board.
1.Reconnect the wiring of the
suction temperature sensor;
2.Replace the suction
temperature sensor;
3.Replace the outdoor control
board.
1. Reconnect the wiring of the
defrosting sensor;
2. Replace the defrosting sensor;
3. Replace the outdoor control
board.
1. Reconnect the wiring of the
high-pressure pressure
sensor;
2. Replace the high-pressure
pressure sensor;
3. Replace the outdoor control
board.
55
Remarks
Applied to
models with
high
pressure
switch or
pressure
sensor
Applied to
models with
low pressure
switch or
pressure
sensor