13-7
TROUBLESHOOTING
SM PNXDCI 1-A.1 GB
13.1.5 Outdoor Unit Diagnosits
No Problem 5 4 3 2 1
1 OCT is disconnected 0 0 0 0 1
2 OCT is shorted 0 0 0 1 0
3 CTT is disconnected 0 0 0 1 1
4 CTT is shorted 0 0 1 0 0
5 HST is disconnected (when enabled) 0 0 1 0 1
6 HST is shorted (when enabled) 0 0 1 1 0
7 OAT is disconnected (when enabled) 0 0 1 1 1
8 OAT is shorted (when enabled) 0 1 0 0 0
9 TSUC is disconnected (when enabled) 0 1 0 0 1
10 TSUC is shorted (when enabled) 0 1 0 1 0
11 IPM Fault 0 1 0 1 1
12 Bad EEPROM 0 1 1 0 0
13 DC under voltage 0 1 1 0 1
14 DC over voltage 0 1 1 1 0
15 AC under voltage 0 1 1 1 1
16 Indoor / Outdoor unit Communication mismatch 1 0 0 0 0
17 No Communication 1 0 0 0 1
18 Reserved 1 0 0 1 0
20 Heat sink Over Heating 1 0 1 0 0
21 Deicing 1 0 1 0 1
22 Compressor Over Heating 1 0 1 1 0
23 Compressor Over Current 1 0 1 1 1
24 No OFAN Feedback 1 1 0 0 0
25 OFAN locked 1 1 0 0 1
26 Compressor Lock 1 1 0 1 0
27 Bad Communication 1 1 0 1 1
13.1.5.1 Outdoor Unit Diagnostics and Corrective Actions
No Fault Probable Cause Corrective Action
1
Sensors failures of all
types
Check sensors connec-
tions or replace sensors.
2 IPM Fault
Electronics HW prob-
lem
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 prob-
lem
Check outdoor unit pow-
er supply voltage
5 AC under Voltage
Check outdoor unit pow-
er supply voltage
6
Indoor / Outdoor unit
Communication mis-
match
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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