87 PB
TROUBLESHOOTING
Diagnostic Codes - Outdoor Unit
Fault
code
Fault description
Possible reasons for
abnormality
How to deal with Remarks
46
IPM and control board
communication fault
1. The cable between the control
board and the driver board is
connected loosely;
2. The cable between the control
board and the driver board fails;
3. The driver board fails
4. The control board fails.
1. Reconnect the cable between
the control board and the driver
board;
2. Replace the communication
cable between the control board
and the driver board;
3. Replace the driver board;
4. Replace the control board.
47
Discharge temperature
exceeds upper limit fault
1. Refrigerant is low.
2. The refrigerant is low due
to the length of the installation
pipe and failure to make proper
calculation
3. Throttling service fails;
4. The outdoor ambient
temperature is too high.
1. Check the welding point to
confirm whether the unit has
leakage point, and then add
some refrigerant;
2. Add some refrigerant Refer
to Refrigerant Charging.
3. Replace the throttling service
(such as capillary, expansion
valve);
4. Normal protection.
48
The outdoor DC fan motor
fault (upper fan motor)
1. The connecting wiring of the
up DC fan motor is loose;
2. The cord of the upper DC fan
motor fails;
3. The upper DC fan motor fails;
4. The drive circuit of the upper
DC fan motor fails;
5. The outdoor fan has
been blocked.
1. Reconnect the wiring of the
up DC fan motor;
2. Replace the upper DC fan
motor;
3. Replace the upper DC fan
motor;
4. Replace the driver board of
the fan motor;
5. Check the outdoor fan
and ensure the outdoor
fan can run normally.
49
The outdoor DC fan motor
fault (lower fan motor)
1. The connecting wiring of the
down DC fan motor is loose;
2. The cord of the lower DC fan
motor fails;
3. The lower DC fan motor fails;
4. The drive circuit of the down
DC fan motor fails;
5. The outdoor fan has
been blocked.
1. Reconnect the wiring of the
lower DC fan motor;
2. Replace the lower DC fan
motor;
3. Replace the lower DC fan
motor;
4. Replace the driver board of
the fan motor;
5. Check the outdoor fan
and ensure the outdoor
fan can run normally.
(Only applicable to 48‑
60k BTU units.
91 The unit turns off due to the
IPM board over heating fault
1. The outdoor ambient temp. is
too high;
2. The speed of the out fan
motor is too low if the fan motor
is AC fan motor;
3. The outdoor unit is not
installed in accordance with the
standard;
4. The supply power is too low.
1. Normal protection;
2. Check the fan capacitor, and
replace the fan capacitor if it is
a failure;
3. Reinstalled the outdoor unit
referring to the installation user
manual;
4. Normal protection.
96 Low Refrigerant The refrigerant of the
unit is not enough.
Discharge the refrigerant
and charge the refrigerant
referring to the rating label.
97 4‑way valve commutation
failure fault. (Valve position
does nor correspond to
call for heat or cool).
1. The connecting wiring of the
4‑ way valve coil is loose;
2. The 4‑way valve coil fails;
3. The 4‑way valve fails;
4. The driver board of
the 4‑way valve fails.
1. Reconnect the wiring of the
4‑way valve;
2. Replace the 4‑way valve coil;
3. Replace the 4‑way valve;
4. Replace the driver
board of the way valve.
NOTE 1: If the indoor unit can not start or the indoor unit stops itself after 30s, at the same time the unit
does not display the fault code, please check the wiring and the socket of the control board.
NOTE 2: If the indoor unit displays the 75,76,77,78 fault code after you turn on the unit, please check the TEST
seat of the indoor control board or the TEST detection circuit to see whether short circuit occurs.
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