DOWNLOAD LG WD-12NBW Service Manual ↓ Size: 6.68 MB | Pages: 39 in PDF or view online for FREE

NO

NO

NO

NO

YES

YES

YES

YES

Is the supplied voltage 220-240V AC?

Is the LED (1) on?

Are the connectors (2) on the PWB loose?

Is wire of the DISPLAY PWB ASSEMBLY  
broken?

Replace  DISPLAY PWB ASSEMBLY 
or repair wire.

Check the fuse or reset
the circuit breaker.

Replace MAIN PWB
ASSEMBLY.

Reconnect.

Replace the MAIN PWB
ASSEMBLY.

NO POWER

8-2. FAULT DIAGNOSIS AND TROUBLESHOOTING

1. Be careful of electric shock if disconnecting parts while troubleshooting.

2. First of all, check the connection of each electrical terminal with the wiring diagram.

3. If you replace the MAIN PWB ASSEMBLY, reinsert the connectors correctly.

CAUTION

Have all the transit bolts and base packing
been removed?

Remove the transit bolts
and Base packing.

Move the washer or
reinforce the floor.

Is the washer installed on a solidly constructed
floor?

Check if the washer is perfectly level as follows:

Check the leveling of the washer with a Level
and check that the washer is stable.

Put an unbalance part (rubber) inside of drum
and start QC test mode and run in high spin
(Refer to section 7-2). 
When the machine is spinning in high speed,
verify that it is stable.

If you do not have the unbalance part, put 4.5 to
6.5 lbs (2 to 3 kg) of clothing. Once loaded,
press power, Rinse+Spin and the start/pause
button in sequence.
When the machine is spinning in high speed,
verify that it is stable. 

If it is not stable, adjust feet accordingly. After
the washer is level, tighten the lock nuts up
against of the base of the washer. All lock nuts
must be tightened.

If it still has severe vibration and noise, regulate a specific spin speed that generates excessive vibration and
noise as follows:

1) Put an unbalance part (rubber) inside of the drum.

2) Start the QC test mode (Refer to section 7-2).

3) Press Delay Wash button, then ‘          ’ is displayed.

4) Press the Spin Speed button repeatedly to select Extra High.

5) Press the Quick Cycle button, the spin speed is displayed.

6) Press the Start/Pause button.

7) Press the Beeper button repeatedly to set spin speed (600, 800, 1000, 1200 rpm) and check if there is vibration

and noise.

8) If there is no vibration and noise, increase the spin speed by pressing Beeper button.

9) If there is vibration and noise, rotate the Cycle selector knob clockwise to reduce the Spin Speed (reduce by 50

and 100 rpm). In case of 600 rpm, it can not reduce the spin speed.

10) If vibration and noise are reduced, press the Quick Cycle button to store (2 beep sounds).

* If you want to return to factory default spin speed setting, repeat above steps except step 9).

Is water supply shut-off?

Open the tap.

Clean the filter.

Check the wiring.

Clean the dispenser.

Put the detergent in the
correct place. 

Replace the INLET VALVE
ASSEMBLY.

Refer to 
NO WATER SUPPLY

Check electrical connection.
Replace the MAIN PWB
ASSEMBLY.

Check the AIR CHAMBER
and the tube (clogged). 

Is the tap opened?

Is the inlet valve filter clogged?

Is water supplied?

Is the detergent caked or hardened?

Are receptacles correctly connected to the
terminals of the INLET VALVE ASSEMBLY?

Has detergent been put in the correct compartment
of the dispenser?

Is resistance between each terminal of INLET
VALVE ASSEMBLY 0.8-1.2 kΩ? 

Verify the voltage of the inlet valve connector is
220-240V AC. 
(Refer to 7-2 QC TEST MODE)

When you press both SPINbutton and RINSE
button simultaneously, is the water level frequency
below 246?