Service manual

12-5
TROUBLESHOOTING
SM HADDCI 1-A.2 GB
15.1.3.3 Outdoor unit Diagnostics
No Problem 54321
1 OCT is disconnected 00001
2 OCT is shorted 00010
3 CTT is disconnected 00011
4 CTT is shorted 00100
5 HST is disconnected (when enabled) 00101
6 HST is shorted (when enabled) 00110
7 OAT is disconnected (when enabled) 00111
8 OAT is shorted (when enabled) 01000
9 TSUC is disconnected (when enabled) 01001
10 TSUC is shorted (when enabled) 01010
11 IPM Fault 01011
12 Bad EEPROM 01100
13 DC under voltage 01101
14 DC over voltage 01110
15 AC under voltage 01111
16 Indoor / Outdoor unit Communication mismatch 10000
17 No Communication 10001
18 Reserved 10010
20 Heat sink Over Heating 10100
21 Deicing 10101
22 Compressor Over Heating 10110
23 Compressor Over Current 10111
… Reserved
27 Bad Communication 11011
15.1.3.4 Outdoor unit diagnosis and corrective actions
For S/W 37V3 and lower ( For 453031000R Controller)
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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