Electra WNG 25 DCI INV Service Manual page 47

TROUBLESHOOTING
12.3.4 Outdoor unit diagnosis and corrective actions
o.
Sensors failures of all
types
IPM Fault
Bad EEPROM
DC under/over Voltage
AC under Voltage
Indoor / Outdoor unit
Communication
mismatch
No Communication
Compressor Lock
Bad Communication
12-6
Probable Cause
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
Revision 0
Corrective Action
Check sensors
connections or replace
sensors.
Check all wiring and
umper 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
Service Manual – WNG DCI
CONTENT