LG LMC1575BD Service Manual page 34

Error Code Case
※ F-13, 14, 15, 16, 19 : These don't appear on the display.
When error display mode is selected, It is displayed on the display.
Error cord Symptom
F-3 Key Error
F-4 Humidity Sensor Error
F-11 Inverter communication Error
Inverter Temperature
F-17
Sensor Error
F-16 Inverter Heat sink Error
F-13 Inverter Over Current
F-14 Inverter Over Voltage
F-15 Inverter Under Voltage
F-19 Inverter Vdc Protection
※ No Error Not heating
Code Case (Etc. Cool : on display)
Error display mode
1. Connect the ac power source, within 10 seconds.
2. Press "Power Level" key and "Defrost" key, 2 second at the same time.
3. Time display change to 'Error' and show error code all.
※ Normal mode is to re-connect to power cord
1. Remove any water or dirt from the touch buttons.
2. Check harness status on Connector of PCB.
3. If it doesn't work, exchange Touch PCB and Main PCB in order.
1. Check sensor harness status on Connector of PCB.
2. Check sensor module using tester.
If it is open , exchange sensor module.
1. Check communication harness status on Connector of PCB.
2. Check connector pin using tester : open or short.
3. If connector is short , exchange Inverter PCB.
4. To check status of IC parts, refer to IC Parts checking page.
1. Check Fan motor status : The wind blows
2. Check communication harness status on Connector of PCB.
3. Check Inverter PCB : check TH91 open or short.
4. If it is open or short , exchange Inverter PCB.
1. Check Fan motor status : The wind blows
2. Check Inverter PCB and the Supports assembly are correct.
3. Check communication harness status on Connector of PCB.
4. After cooling down Inverter PCB , check resistance value of TH91.
5. If resistance value is not 15K~18Kohm at room temperature, exchange inverter PCB.
1. Check Fan motor status : The wind blows
2. Check MGT status : Magnet crack, Antenna/Gasket burnt mark
3. Check communication harness status on Connector of PCB.
4. Check inverter PCB step 1 : AC connector , D5 Open or Short
5. Check inverter PCB step 2 : D8, D9 Open or Short.
Q1 Short and resistance value.
6. If AC, D5, D8, D9 Short or Q1 resistance value is not 10Kohm, exchange Inverter PCB.
7. To check status of IC parts, refer to IC Parts checking page.
1. Check Fan motor status : The wind blows
2. Check MGT status : Magnet crack, Antenna/Gasket burnt mark
3. Check communication harness status on Connector of PCB.
4. Check temperature on display, after 3 minutes check it again.(ex. before 90↑→ after 90↑)
5. To check status of IC parts, refer to IC Parts checking page.
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REMEDY