13-32
CONTROL SYSTEM
Revision Y05-01
Service Manual - DNG Series
13.10 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:
x HEAT LED blinks 5 times in 5 seconds, and then turns off for the next 5
seconds.
x 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 doesn’t 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.
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