12-3
TROUBLESHOOTING
SM DUO38I 1-A.2 GB
1.3.2 Outdoor unit diagnosis by MSMP and corrective actions
No.
Fault
Probable Cause
Corrective Action
1
Sensors failures of all types
Check sensors connections
or replace sensors.
2
IPM Fault
Electronics HW
problem
Check all wiring and jumper
settings, if OK, replace
electronics.
3
Bad EEPROM
No action, unless special
parameters are required for
unit operation.
4
DC under/over Voltage
Electronics HW
problem
Check outdoor unit power
supply voltage
5
AC under Voltage
Check outdoor unit power
supply voltage
6
Indoor / Outdoor unit
Communication mismatch
Indoor and Outdoor
controllers are with
different versions
Replace Indoor controller
7
No Communication
Communication or
grounding wiring is not
good.
Check Indoor to Outdoor
wiring and grounding
8
Compressor Lock
Switch unit to STBY and
restart
9
Bad Communication
Communication quality is
low reliability
Check Indoor to Outdoor
wiring and grounding
