Troubleshooting - LG PUDCA0 Installation Manual

TROUBLESHOOTING

34
TROUBLESHOOTING
Problem
AHU Communication Kit
does not work
Error Indicator
- This function indicates types of failure in self-diagnosis and occurrence of failure for air condi-
tion.
- Error mark is displayed on wired remote controller, and 7-segment LED of outdoor unit control
board as shown in the table.
- If more than two troubles occur simultaneously, lower number of error code is first displayed.
- After error occurrence, if error is released, error LED is also released simultaneously.
[Error Code (Comm.Kit)]
Display Number
CH 01
CH 02
CH 03
CH 05
CH 06
CH 09
Cause
No power supply
Wiring is wrong
AHU Communication Kit
is broken
Error Item
Room Temperature
Pipe In Temperature sensor
error
Communication error between
wired remote controller and
Comm. Kit
Communication error between
Comm.
Kit and Outdoor Unit
Pipe Out Temperature sensor
error
Option PCB EEPROM error
Remedy
Check the electrical connection and voltage
of the power supply.
Check the electrical connection of the
Communication Kit (Refer to the circuit dia-
gram of the Communication Kit)
Check the electrical and mechanical part.
Cause of Error
Temperature sensor disconnection or
short circuit on Room or RA of AHU
Temperature sensor disconnection or
short circuit on pipe inlet of AHU
No communication signal for more
than 3 minutes from wired remote
controller to the Comm. Kit
No communication signal for 5 minutes
continuously from Comm. Kit to Out-
door Unit
Temperature sensor disconnection or
short circuit on pipe outlet of AHU
No reading signal for 5 times continu-
ously from EEPROM to Comm. Kit