TROUBLESHOOTING & REFERENCES
J-23
ENGLISH
Topic TitleFlow Charts
Replace
sensor
Is the sensor wiring
firmly and correctly in
place?
Is the sensor
resistance within
range?
Is the temperature
loop acquired by
the computer board
normal?
Replace
sensor
Replace
it.
No
No
Yes
Yes
Yes
[10] Outdoor defrosting temp. sensor Te abnormal
[11] Suction temp.sensor Ts abnormal
[12] Outdoor ambient temp. sensor Ta abnormal
[13] Discharging temp. sensor Td abnormal
Sensor temperature has been detected below or higher than expected,
or the sensor has been detected as a shorted or open circuit.
(for expected temperature, refer to part failure code)
Possible causes:
• Bad sensor connection
• The sensor is bad
• Sensor resistance drift
• The temperature acquired by PCB is not accurate
Replace wire
Is the communication wire is
shorted?
Is the communication wire
CN21 is disconnected?
Reconnect
Reconnect
Yes
No
No
Yes
Is the wiring connection sequence
correct according to the wiring
diagram?
No
Measure the outdoor terminal block voltage
between communication 3 and N, and measure the
indoor terminal block between communication 3
and N to check. Is the communication wire ok?
Yes
Replace the
communication wire
Power off
Power on
No
Yes
Using a multimeter, measure the terminal
corresponding to the N-line voltage of CN21
from the indoor unit with the communication
failure. Is the voltage normal?
No
PCB is bad, replace PCB
[15] Communication abnormal between indoor unit and outdoor unit
Outdoor unit control board cannot communicate
with the indoor unit control board for over 4
minutes.
Possible causes:
• Bad communication wiring
• The PCB is bad
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