LG WT4801CW Service Manual page 33

7) Water does not drain.
When, what, and how to check
Drain Pump
1. Can you hear the drain pump running?
2. Check resistance between terminals if
there is no working sound of the drain
pump.
3. If the motor tests good, check the
connector.
Drain Hose
1. Verify the drain hose is not pinched,
kinked, or mashed.
2. Verify the drain hose is not clogged or
obstructed.
8) Water drains, but at the wrong time
When, what, and how to check
PV asm
1. If water runs back into the machine after
the drain cycle, inspect the pump's
check valve to verify it is not obstructed
by lint or foreign material.
Controller
1. Check to see if the drain pump or drain
motor runs at power up (before the
POWER button is pressed.
Result of Check
Yes Drain pump is blocked by
foreign objects.
∞Ω The motor is open.
LEAVE BLANK Defective connector.
LEAVE BLANK Connector OK.
Pinched, kinked, or Incorrect installation.
mashed.
LEAVE BLANK Blocked hose.
Result of Check
Blockage in pump
housing or drain
bellows.
LEAVE BLANK
Check valve and / or
drain bellows
deformed or
damaged.
Defective triac on main
The pump runs.
board.
33
Possible Cause
NOTE: There is no place to
do this. Please include the
correct pump information for
this machine. This is useless.
Replace the pump.
Replace the main board.
Replace the main control
board.
Reinstall correctly.
Unstop the hose and re-
install it so it is not kinked,
pinched, or mashed.
Possible Cause
Remove the blockage or
foreign objects.
Replace the check valve and
/ or the bellows. These soft
rubber parts may swell if
contacted by petroleum-
based products.
Replace the main board.
How to repair
How to repair