LG LWD3010ST Service Manual page 45

CHECKING FLOW CHART BY FAIRURE
Oven does not heat (including F-9, F-19 Error)
No heating
Disconnect power
Check the electric wiring
1. Harness of Relay connection.
2. Each heater's connection.
3. system and Relay PCB connection
(CN11, CN12)
Normal?
Check the thermostat open/short
between DLB Relay's L2 and L2 (BK wire)
If it have the error, it is open state.
Normal?
1
No
Yes
No
UPPER
LOWER
Fix or replace the lead wire
END
Replace thermostat
9-6
END