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CONTROL SYSTEM
11-37SM SX Ser1-A.3 GB
11.16 System Diagnostics
Pressing Mode button for 5-10 seconds in SB or any other operation mode will activate
the DIAGNOSTICS mode, acknowledged by 3 short beeps and lighting of COOL and
HEAT LEDs.
In DIAGNOSTICS mode, system failures will be indicated by the blinking of HEAT &
COOL LEDs.
The coding method is as follows:
HEAT LED blinks 5 times in 5 seconds, and then turns off for the next 5
seconds.
COOL LED blinks during the same 5 seconds according to the following table:
No. Problem 1 2 3 4 5
1 RT1 is disconnected 
2 RT1 is shorted 
3 RV fault 
4 RT2 is disconnected 
5 RT2 is shorted 
6 (Reserved) 
7 RT2 temp reading doesn’t change 
8 RT3 is disconnected 
9 RT3 is shorted 
10 (Reserved) 
11 RT3 temp reading doesn’t change 
12 RT2 & RT3 temp reading doesnt change 
LEGEND
 - ON,  - OFF
NOTES
1. If faults occur in more than one thermistor (except case
number 12 in table above), only one fault will be indicated
according to the following order: RT3, RT2, RT1.
2. A/C will return to normal mode when sending a command by
the R/C during system DIAGNOSTICS mode. If the command
from the R/C contains a Group ID, the ID will become the new
Group ID of the ELCON unit.
CONTENT
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