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38MGRBQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Indoor units mode conflict
ERROR CODE
MALFUNCTION DECISION
CONDITIONS
SUPPOSED CAUSES
COOLING MODE
HEATING MODE
FAN
OFF
No: No Mode Conflict:
Yes: Mode Conflict
Troubleshooting
High temperature protection
Check if the radiator is secure.
Check if the electronic
control box is installed well.
grease does not have a
coating or uneven coating.
Replace the IPM board
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
REFER TO INDOOR UNIT SERVICE MANUAL
The indoor units cannot work cooling mode and heating at same time. Heating mode has the priority.
If indoor unit A is working in COOLING mode or fan mode, and indoor unit B is set to HEATING mode, then A
will switch off and B will work in HEATING mode.
If indoor unit A is working in HEATING mode, and indoor unit B is set to COOLING mode or fan mode, then B
will change to standby and A will not change.
COOLING MODE
No
Yes
No
No
of IPM board
r
Yes
Yes
Check if the thermal
HEATING MODE
FAN
Yes
No
No
Yes
Yes
No
No
No
Secure the radiator well.
No
Install the electronic control
No
box correctly.
No
Coat thermal grease again
44
OFF
No
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