LG LMVH1750SB Service Manual page 38

(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/ENTER
pad is touched.
Temperature in
the oven cavity is
lower or higher
than preset.
CHECK
Check the Relay
10 of P.C.B.
assembly.
Check the
connection between
P.C.B. assembly and
headwire connector.
Check the Relay
10 of P.C.B.
assembly.
Check the
convection heater
element.
Check the
circulation motor.
Check the
thermistor.
Check the Rack.
RESULT
Abnormal.
Normal.
No continuity.
Abnormal.
Normal.
Abnormal.
Normal.
Abnormal.
Normal.
Error message
shows in the display.
Normal.
Cook on the
glass tray.
7-28
CAUSE
Defective Relay
10.
Loose connection.
Defective Relay
10.
Defective
convection heater.
Defective
circulation motor.
Thermistor open
or short.
Without
metal rack.
REMEDY
Replace Relay
10.
Connect them
tightly.
Replace
Relay 10.
Replace
convection heater.
Replace
circulation motor.
Replace
thermistor.
Cook with
metal rack.