Electra DELTA 22 Service Manual page 47

1.3.2 Outdoor unit diagnosis by MSMP and corrective actions
No.
Sensors failures of all types
1
2 IPM Fault
Bad EEPROM
3
DC under/over Voltage
4
AC under Voltage
5
6 Indoor / Outdoor unit
Communication mismatch
No Communication
7
Compressor Lock
8
Bad Communication
9
SM DUO38 1-E.1 GB
Fault
Electronics HW
problem
Electronics HW
problem
Indoor and Outdoor
controllers are with
different versions
Communication or
grounding wiring is not
good.
Communication quality is
low reliability
CONTENT
Probable Cause
TROUBLESHOOTING
Corrective Action
Check sensors connections
or replace sensors.
Check all wiring and jumper
settings, if OK, replace
electronics.
No action, unless special
parameters are required for
unit operation.
Check outdoor unit power
supply voltage
Check outdoor unit power
supply voltage
Replace Indoor controller
Check Indoor to Outdoor
wiring and grounding
Switch unit to STBY and
restart
Check Indoor to Outdoor
wiring and grounding
12-3