LG WM0742H*A Service Manual page 27

WASH HEATER TROUBLE
When checking the voltage between
connector during whites washing.
is the voltage 120V AC?
After power off, is the resistance of wire (BN-
BL) connectores between 10Ω ~ 30Ω?
After power off and the heater terminal
is disconnected, is the resistance
10Ω ~ 30Ω?
HEATING CONTINUOUSLY ABOVE
THE SETTING WATER TEMPERATURE
When pressing WASH/RINSE,
is the displayed temperature over 10
higher then the selected temperature?
Hot : 50
Warm : 40
Cold : 30
Is the resistance between
of Connector (1) 2.5-180kΩ?
When checking the THERMISTOR on the tub,
is the THERMISTOR loose?
YES
NO
YES
and
2 3
4 5
1 2
YES
26
Replace the MAIN
NO
PWB ASSEMBLY.
Normal
YES
Replace the
NO
Heater Aseembly.
Check if inlet hose is
connected to a hot
faucet; otherwise,
NO
replace MIAN PWB
ASSEMBLY.
Check electrical
connection.
NO
6
Replace THERMISTOR
3
Push the THERMISTOR
YES
tighthy to the rubber.