LG LZ-H0106BA0 Service Manual page 46

Troubleshooting
(304) Breakdown mode 4: Ventilation system does not work. It works abnormally.
Checklist table(table 4) of ventilation system.
No. Details
Fan does not operate.
1
failure in fan operation
No interlocking to
2
external equipment (air
conditioner)
3 Ventilation system
operated by main
power
4 Frequent stop of air
changing fan
5
Frequent stop of air
changing and
ventilating fans
46 Ventilation System
Possible Causes
• Connecting failure in control circuit
connector or fan related connector
• No power on ventilation system, or
incorrect power
• Central control is set in ventilation
system
• Incorrect terminal plate for
connecting to external signals
• No input of external equipment
signals
• Power failure
• When the option switch No.8 is set
ON and air temperature is below
-15°C or above 45°C
• When air temperature ranges from
-10C to -15C, it stops to prevent the
electric heat exchanger of
ventilation system from freezing
(intermittent operation)
• When ducted with Multi V air
conditioner(made by this company)
by interlocking, the air conditioner
stops in case of defrosting.
• Displayed power saving operation
• Displayed intermittent operation
Necessary actions
• Check the connection of control circuit
connector and lead line connecting connector
• Check the power
• Check LOCK of central control and address
of ventilation system
• Check the connection of external control
terminal(CN-AIR)
• Check the external equipment
• If main power is disconnected by remote
controlling during ventilation system
operation, ventilation system operates.
(normal condition with no errors)
• Normal condition with no errors
• Normal condition with no errors
• Normal condition with no errors