LG LRG30855ST Technical Service Manual page 55

Oven Sensor and Door Switch Test
Note: See Lock Motor and Door Latch Switch Circuit Information for door switch function
explanation.
1. Remove power from oven.
2. Locate and disconnect the wire harness from CN2 (convection model) or P101 (non-convection
model) location on the ERC.
3. Make resistance measurement from the side of the wire harness connector with exposed terminals.
4. If abnormal reading is observed, check leads in the wire harness connector. If any variation, repair
or replace wire harness.
Circuit
Oven Sensor
Door Unlatched
Door Latched
Door Unlocked
LATCH
COM
SWITCH #1
Y
COM
LATCH
SWITCH #2
M1
OVEN
M2
SENSOR
Door Unlocked
Latch switch
# 2 open
Latch switch
# 1 closed
Cam
visible
Terminals
6 to 8
3 to 5
2 to 5
3 to 5
4 to 5
NO
O
NO
S
Y
W
S
8
1
Ohms
1100 Ohms (approximately) @ Room Temperature
2545 Ohms (approximately) @ 815°F (435°C)
0 Ohms
Open
Open
0 Ohms
Door Locked
LATCH
SWITCH #1
Y
LATCH
SWITCH #2
M1
OVEN
M2
SENSOR
Door Locked
Latch switch
# 1 open
– 55 –
COM NO
O
NO
COM
S
Y
W
S
8
1
Latch switch
# 2 closed
Cam not
visible