11-3
TROUBLESHOOTING
SM SX DCI 1-A.3 GB
When system enters diagnostics mode, only one fault code is shown. Order of priority is from
the lower to the higher number. Diagnostics is continuously ON as long as power is ON. The
current system operation mode will not be changed.
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 Heat & Cool LEDs.
The coding method will be as follows:
Heat LED will blink 5 times in 5 seconds, and then will be shut off for the next 5 seconds. Cool
LED will blink during the same 5 seconds according to the following Indoor / Outdoor unit
tables:
Note: 0 – OFF, 1-ON
11.3.1 Indoor Unit Diagnostics
● Alarm Output
The Alarm Output dry contact will be on (closed), when a predefined set faults occur.
The fault set is defined under diagnostics section.
The alarm output will be off (open), when the predefined fault is cleared.
The indoor alarm outputs are defined according to the following table:
No Problem AO54321
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
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