44
Troubleshooting
PA
Indoor and outdoor
mismatch
√
Outdoor
1. The outdoor unit valve is
close.
2. The refrigerant connecting
pipe installation errors.
3. The inside and outside
the machine connecting
wiring error.
4. The refrigerant connecting
pipe with the connection
order sequence.
1. Check the outdoor unit
valve is open.
2. The refrigerant connecting
pipe installation errors.
3. Check the inside and
outside the machine
connecting wiring is correct.
4. Check the refrigerant
connecting pipe with the
connection is in order
sequence.
PC
Mode conflict
√
Outdoor
Failure in indoor model
conflicts with the operation
mode of the outdoor unit.
Power off or change the
failure in indoor unit mode
to non-conflicts mode.
U0
Indoor ambiet temp
sensor short\open
√
Indoor
1.The wiring terminal between
the temperature sensor and
the mainboard loosened or
poorly contacted.
2.The sensor is broken.
3.The mainboard is broken.
1.Check the wiring terminal.
2.Change the sensor.
3.Change the mainboard.
U1
Indoor mide pepe temp
sensor short\open
√
Indoor
1.The wiring terminal between
the temperature sensor and
the mainboard loosened or
poorly contacted.
2.The sensor is broken.
3.The mainboard is broken.
1.Check the wiring terminal.
2.Change the sensor.
3.Change the mainboard.
U2
Outdoor ambient temp
sensor short\open
√
Outdoor
1.The wiring terminal between
the temperature sensor and
the mainboard loosened or
poorly contacted.
2.The sensor is broken.
3.The mainboard is broken.
1.Check the wiring terminal.
2.Change the sensor.
3.Change the mainboard.
U3
Outdoor mid-coil temp
sensor short\open
√
Outdoor
1.The wiring terminal between
the temperature sensor and
the mainboard loosened or
poorly contacted.
2.The sensor is broken.
3.The mainboard is broken.
1.Check the wiring terminal.
2.Change the sensor.
3.Change the mainboard.
U4
Outdoor pipe temp
sensor short\open
√
Outdoor
1.The wiring terminal between
the temperature sensor and
the mainboard loosened or
poorly contacted.
2.The sensor is broken.
3.The mainboard is broken.
1.Check the wiring terminal.
2.Change the sensor.
3.Change the mainboard.
U5
IPM temp sensor short\
open
√
Outdoor
The IPM temp sensor is
broken.
Change the mainboard.
U6
Liquid pipe outlet temp
sensor short\open
√
Outdoor
1.The wiring terminal between
the temperature sensor and
the mainboard loosened or
poorly contacted.
2.The sensor is broken.
3.The mainboard is broken.
1.Check the wiring terminal.
2.Change the sensor.
3.Change the mainboard.
U7
Gas pipe outlet temp
sensor short\open
√
Outdoor
1.The wiring terminal between
the temperature sensor and
the mainboard loosened or
poorly contacted.
2.The sensor is broken.
3.The mainboard is broken.
1.Check the wiring terminal.
2.Change the sensor.
3.Change the mainboard.
U8
Discharge temp sensor
short\open
√
Outdoor
1.Outdoor pipe temp sensor
is not in the right position.
2.The sensor is broken.
3.The mainboard is broken.
1.Check the sensor position.
2.Change the sensor.
3.Change the mainboard.