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Only for training and service purposes
LGE Internal Use Only
Troubleshooting
Instructions for diagnostics
- When replacing main PCB, detach the supporter for fixing the main PCB from PCB.
- When separating main PCB, be careful of the edge of metal plate.
- When pulling or putting a connector on main PCB, do not pull the lead wire, instead pull the entire housing.
- After replacing main PCB, establish the switch setting on main PCB in the same manner as the previous main PCB.
Service Checkup procedure
Checkup items
1. Breakdown condition : Remote controller display
etc.
2. Breakdown frequency : The first starting date of
operation/ the first date of
breakdown
3. Breakdown timing
4. presence of contract drawing : Equipment (including
separate purchase/control
equipment) wiring/piping/
setting
Breakdown mode1: system does not start normally.
Breakdown mode2: Abnormal(failure) code is displayed on
remote controller.
LED is flickering on the circuit panel of
ventilation system.
Breakdown mode 3: Remote controller does not work.
It works abnormally.
Breakdown mode 4: Ventilation system does not work.
It works abnormally.
• Check the initial checklist
table(table1-1) indicating from
installation to operation
• If using wired remote controller, check
the system checklist table(table1-2).
Check the LED signs table(table 2) and
error codes displayed in Remote Controller.
Check the checklist table(table3) for using
Remote Controller.
Check the checklist table(table 4) of
ventilation system.
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