Service manual

12-3
TROUBLESHOOTING
SM HADDCI 1-A.2 GB
If no fault occurred in the system, no fault code will be displayed during normal operation
mode. The last fault code will be displayed even if the system has recovered from that
fault. The last fault will be deleted from the EEPROM after the system has exit diagnostics
mode.
In diagnostics mode, system fault / status will be indicated by blinking of Filter & Timer LEDs.
The coding method will be as follows:
Filter LED will blink 5 times in 5 seconds, and then will be shut off for the next 5 seconds.
Timer LED will blink during the same 5 seconds according to the following Indoor / Outdoor
unit tables:
Note: 0 – OFF, 1-ON
15.1.3.1 Indoor unit Diagnostics
No Problem AO 54321
1 ICT is disconnected Yes 0 0 0 0 1
2 ICT is shorted Yes 0 0 0 1 0
3 RAT is disconnected Yes 0 0 0 1 1
4 RAT is shorted Yes 0 0 1 0 0
5 Reserved (for MSMP used as RGT fault) No 0 0 1 0 1
6 ICTE shorted/disconnected (when enabled) Yes 0 0 1 1 0
7 Undefined IDU Family/Model Yes 0 0 1 1 1
8 No Communication Yes 0 1 0 0 0
9 No Encoder No 0 1 0 0 1
10 Reserved No 0 1 0 1 0
11 Outdoor Unit Fault No 0 1 0 1 1
… Reserved No
17 Defrost protection No 1 0 0 0 1
18 Deicing Protection No 1 0 0 1 0
19 Outdoor Unit Protection No 1 0 0 1 1
20 Indoor Coil HP Protection No 1 0 1 0 0
21 Overflow Protection Yes 1 0 1 0 1
22 Reserved No
24 EEPROM Not Updated No 1 1 0 0 0
25 Bad EEPROM No 1 1 0 0 1
26 Bad Communication No 1 1 0 1 0
27 Using EEPROM data No 1 1 0 1 1
28 Model A No 1 1 1 0 0
29 Model B No 1 1 1 0 1
30 Model C No 1 1 1 1 0
31 Model D No 1 1 1 1 1
Yes AO => Alarm Operation
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