TROUBLESHOOTING
SM PNXADCI 1-A.1 GB
13-3
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 Filter & Timer LEDs.
The coding method will be as follows:
Filter LED will blink 5 times in 5 seconds, and then will be shut off for the next 5 seconds. Timer
LED will blink during the same 5 seconds according to the following Indoor / Outdoor unit tables:
Note: 0 – OFF, 1-ON
13.1.3.1 Indoor unit Diagnostics
No
Problem
5
4
3
2
1
1
RT-1 is disconnected
2
RT-1 is shorted
3
RT-2 is disconnected
4
RT-2 is shorted
5
Reserved
7
Communication mismatch
8
No Communication
9
No Encoder
10
Reserved
11
Outdoor Unit Fault
…
Reserved
17
Defrost protection
18
Deicing Protection
19
Outdoor Unit Protection
20
Indoor Coil HP Protection
21
Reserved
22
Reserved
24
EEPROM Not Updated
25
Bad EEPROM
26
Bad Communication
27
Using EEPROM data
