8-34
CONTROL SYSTEM
Revision Y05-01
Service Manual - DNC Series
System diagnostics
Pressing Mode button for 5-10 seconds in SB or any other operation mode will activate
diagnostic mode by the acknowledgment of 3 short beeps and lighting of COOL and HEAT
LEDs.
In diagnostic mode, system problems will be indicated by blinking of Heat & Cool LEDs.
The coding method will be as follow:
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 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
- ON, - OFF
Notes:
1. If faults occur in more than one thermistor (except case number 12 on the
table above), only one fault will be indicated according to the following order:
RT3, RT2, RT1.
2. A/C will jump out to normal mode if sending a command by the R/C in the
system diagnostics mode. If this command from the R/C contain a Group ID,
this ID will become the new Group ID of the ELCON unit.
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