TROUBLESHOOTING
12-6
Revision 0
Service Manual – WNG DCI
12.3.4
Outdoor unit diagnosis and corrective actions
o.
Fault
Probable Cause
Corrective Action
Sensors failures of all
types
Check sensors
connections or replace
sensors.
IPM Fault
Electronics HW
problem
Check all wiring and
umper settings, if OK,
replace electronics.
Bad EEPROM
No action, unless special
parameters are required
for unit operation.
DC under/over Voltage
Electronics HW
problem
Check outdoor unit power
supply voltage
AC under Voltage
Check outdoor unit power
supply voltage
Indoor / Outdoor unit
Communication
mismatch
Indoor and Outdoor
controllers are with
different versions
Replace Indoor controller
No Communication
Communication or
grounding wiring is not
good.
Check Indoor to Outdoor
wiring and grounding
Compressor Lock
Switch unit to STBY and
restart
Bad Communication
Communication quality is
low reliability
Check Indoor to Outdoor
wiring and grounding
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