12-3
TROUBLESHOOTING
SM DUODCI 1-A.1 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
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