LG PQNFB17B0 - Manual (Page 90)

Troubleshooting
- Problem : The indoor unit is not found when checking whether the indoor unit is connected or not by
using the Web Server function.
→ If normal, the indoor units are displayed on the Web Server as many as the number of
the installed indoor units.
- Expected cause : The IP address and the Gateway address of the BACnet Gateway are not
correctly set.
The LAN cable is used incorrectly
The polarity between the PI 485 and the Gateway is changed
- Diagnosis
Are all indoor
units not found?
Perform the PING test
at the command prompt
window
NO
Does the LG-NET LED
of the BACnet Gateway
blinks?
Use the PMNFP14A1M by
checking the model name
of the PI485.
YES
Is it not searched for
each outdoor unit?
NO
NO
Do LED 02G and
03G of the PI485 of the said
outdoor unit keep
blinking?
YES
YES YES
NO
Is it not searched for
each outdoor unit?
YES
Fail YES
Check the
communication polarity
and short/open between
the PI 485 and the
BACnet Gateway and
check the setting of the
indoor unit address
Check the IP address and the
Gateway address of the
BACnet Gateway. Check
whether the LAN cable is
correct or not (direct cable
when the hub is used, cross
cable when the hub is not
used). Check whether the IP
of the PC can communicate
with the Gateway or not (It is
possible to communicate only
when the first three digits of
the private IP are same) If it is abnormal after resetting
the BACnet Gateway,
consider whether to replace
the BACnet Gateway or not
Check the A/B polarity
between the said PI485 and
the Gateway. Check the
number of the outdoor unit
and the number of the PI485.
Recheck the setting of the
indoor unit address Make
sure that the communication
of the indoor/outdoor unit is
normal.
Check the said PI485
connection and the DIP switch.
Check whether the
communication of the
indoor/outdoor unit is normal
or not and check the setting of
the indoor unit address
90 BACnet Gateway