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