CONTROL SYSTEM
Service Manual-CN Fixed RPM series
12-47
12.17 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
ż
ż
ż
ż
ż
1
RT1 is disconnected
ż
Ɣ
Ɣ
Ɣ
Ɣ
2
RT1 is shorted
ż
Ɣ
Ɣ
Ɣ
ż
3 (Reserved)
ż
Ɣ
Ɣ
ż
Ɣ
4
RT2 is disconnected
Ɣ
ż
Ɣ
Ɣ
Ɣ
5
RT2 is shorted
Ɣ
ż
Ɣ
Ɣ
ż
6 (Reserved)
Ɣ
ż
Ɣ
ż
Ɣ
7
RT2 temp reading doesn’t change
Ɣ
ż
Ɣ
ż
ż
8
RT3 is disconnected
Ɣ
Ɣ
ż
Ɣ
Ɣ
9
RT3 is shorted
Ɣ
Ɣ
ż
Ɣ
ż
10 (Reserved)
Ɣ
Ɣ
ż
ż
Ɣ
11
RT3 temp reading doesn’t change
Ɣ
Ɣ
ż
ż
ż
12
RT2 & RT3 temp reading doesn’t change
Ɣ
ż
ż
ż
ż
ż
- ON,
Ɣ
- 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.
Содержание ONG3-17 R410A
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