LG LMH1017CVW Service Manual page 29

(TROUBLE 6) Convection oven does not operate at all or convection cook
is bad.
CONDITION
Convection indicator
light but oven does
not go into cook
cycle when START
pad is touched.
Temperature in
the oven cavity is
lower or higher
than preset.
CHECK
Check the Relay
4 or 6 of P.C.B.
assembly .
Check the
connection between
P.C.B. assembly and
headwire connector.
Check the Relay
4 or 6 of P.C.B.
assembly .
Check the
convection heater
element.
Check the
circulation motor.
Check the
damper motor.
Check the air
duct assembly.
Check the
thermistor.
Check the Rack.
RESULT
Abnormal
Normal
No continuity.
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Interference
Damper open
and close at air
duct assembly.
Normal
Error message
shows in the display.
Normal
Cook on the
glass tray.
5-18
CAUSE
Defective Relay
4 or 6.
Loose connection.
Defective Relay
4 or 6.
Defective
convection heater.
Defective
circulation motor.
Defective
damper motor.
Defective air
duct assembly.
Thermistor open
or short.
Without
metal rack.
REMEDY
Replace Relay
4 or 6.
Connect them
tightly.
Replace
Relay 4 or 6.
Replace
convection heater.
Replace
circulation motor.
Replace
damper motor.
Replace air duct
assembly.
Replay
thermistor.
Cook with
metal rack.