13-11
TROUBLESHOOTING
SM OU12HP 2-E.2 GB
No Fault Name 54321
1 RT-1 is disconnected
2 RT-1 is shorted
3 RT-2 is disconnected
11
4 RT-2 is shorted
1
… Reserved
1
1
7 Communication mismatch
111
8 No Communication
1
9 No Encoder
1
1
10 Reserved 01010
11 Outdoor Unit Fault 01011
… Reserved
17 Defrost protection 1
1
18 Deicing Protection 1
1
19 Outdoor Unit Protection 1
11
20 Indoor Coil HP Protection 1
1
21 Overflow Protection 1
1
1
… Reserved
24 EEPROM Not Updated 1 1
25 Bad EEPROM 1 1
1
26 Bad Communication 1 1
1
27 Using EEPROM data 1 1
11
28 Model A 1 1 1
29 Model B 1 1 1
1
30 Model C 1111
31 Model D 11111
1 - ON, 0 - OFF
Only one code is shown. Order of priority is lower to the higher number. Diagnostics is continuously
ON as long power is on.
13.4.4 Indoor unit diagnostics and corrective actions
No. Fault Probable Cause Corrective Action
1-4 Sensor failures
Sensors not
connected or
damaged
Check Thermistor (13.5.13)
7
Communication
mismatch
Mismatch between
IDU and ODU
models
Units are not designed to operate
together as system. Check and replace
the models installed.
8 No Communication
IDU-ODU
communication
Check communication between indoor
and outdoor units (13.5.17)
9 No Encoder
Indoor electronics or
motor
Check motor wiring, if ok, replace motor
If still not ok
replace Indoor electronic assembly
(14.2.2)
11 Outdoor Unit Fault
Outdoor controller
problem
Check for any fault code shown on
outdoor unit display board and act
accordingly (13.4)
17-18 Protections Indication No action
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