Troubleshooting - LG LZ-H0106BA0 Service Manual

Troubleshooting

Troubleshooting
Instructions for diagnostics
- When separating main PCB, hold the tip of main PCB to prevent any force into over-all parts.
- 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.
For the ventilation system failure
No. Failure
1 Failure in Operation
Failure in Total Heat
2
Exchange
3 Failure in Operating
Remote controller switch
4 Failure in
Supply/Exhaust Fan
Operation
5
Failure in Defrosting Operation
6
Failure in Air flow
Control
* Failure in Damper
7
Operation
❈ The part marked with * is not applied to LZ-H102SB/152SB/252SB.
40 Ventilation System
Possible Causes
• Check the power line
• Check the wiring of PCB remote
controller switch
• Check if FUSE is disconnected
• * Isn't it normal ventilation mode?
• * Is damper working normally?
• Check the PCB remote controller
switch wiring
• Check the PCB remote controller
switch wiring
• Check the capacitor for fan motor
• Check the fan motor
• *Defrosting operation
• Check the Thermistor
• Check if it is AC220V for power of
PCB fan motor terminal
• Check the connection of connector to
PCB
• Isn't it in defrosting operation?
Necessary actions
• Re-construct the power
• Wire in accordance with power wiring diagram
• Replace FUSE
• Convert the function into
Total heat exchange mode
• Check whether damper is operating while
repeating total heat exchange and normal
ventilating alternately
• Wire in accordance with power wiring diagram
• Wire in accordance with power wiring diagram
• Re-wire for capacitor separation, and replacing
for inferior capacitor
• Re-wire for motor Connector separation, and
replacing for inferior motor
• Check the Thermistor, Check Outdoor
Temperature
• Replace the Thermistor
• If it is AC220V, the air flow control relay is in bad
condition (replace PCB)
• Re-wire for damper connector separation, and
replacing for inferior connector
Check the Outdoor temperature