12-3
TROUBLESHOOTING
Revision Y06-01
Service Manual - WNG/LEX DCI
12.3
Judgment by Indoor/Outdoor Unit Diagnostics
Enter diagnostics mode - press for five seconds Mode button in any operation mode.
Acknowledgment is by 3 short beeps and lights of COOL and HEAT LEDs. Then, every short
pressing of Mode button will scroll between Indoor and Outdoor unit diagnostic modes by the
acknowledgment of 3 short beeps and lighting of COOL and HEAT LED s.
'
During the Outdoor unit diagnostics all four Indoor LED’s, (STBY, Operate, Filter and Timer)
are blinking. When Indoor diagnostics is displayed, all four LED’s (STBY, Operate, Filter and
Timer) are ON.
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 d 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
12.3.1
Indoor unit Diagnostics
No
Problem
5
4
3
2
1
1
RT-1 is disconnected
0
0
0
0
1
2
RT-1 is shorted
0
0
0
1
0
3
RT-2 is disconnected
0
0
0
1
1
4
RT-2 is shorted
0
0
1
0
0
5
Reserved
0
0
1
0
1
7
Communication mismatch
0
0
1
1
1
10 Reserved
0
1
0
1
0
11 Outdoor Unit Fault
0
1
0
1
1
17 Defrost protection
1
0
0
0
1
19 Outdoor Unit Protection
1
0
0
1
1
20 Indoor Coil HP Protection
1
0
1
0
0
21
Overflow Protection
1
0
1
0
1
22 Reserved
24 EEPROM Not Updated
1
1
0
0
0
25 Bad EEPROM
1
1
0
0
1
26 Bad Communication
1
1
0
1
0
27 Using EEPROM data
1
1
0
1
1
28 Model A
1
1
1
0
0
29
18
8
No Communication
0
1
0
0
0
No Encoder
0
1
0
0
1
9
...
Reserved
30 Model C
1
1
1
1
0
31 Model D
1
1
1
1
1
Model B
1
1
1
0
1
Deicing Protection
1
0
0
1
0
