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8-2. FAULT DIAGNOSIS AND TROUBLESHOOTING

1. Be careful of electric shock or disconnecting the parts while trouble shooting.

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

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

<PWB ASSEMBLY (MAIN)>

<PWB ASSEMBLY (MAIN)>

Check the fuse or reset
the circuit breaker.

Replace MAIN PWB
ASSEMBLY

Reconnect.         

Reconnect.         

Is the supplied voltage 120 V AC?

Is the led(1) on?

Are the connectors (2) on the PWB loose?

Is wire of the PWB ASSEMBLY disconnected?

Replace PWB ASSEMBLY

CAUTION

NO

YES

NO

NO

YES

NO

YES

YES

NO

NO

YES

YES

YES

NO

NO

NO

YES

MAX

max

M

A

X

Detergent

for wash

Fabric

softener

Liquid

Bleach

Is water supply shut-off?

Is the tap opened?

When you press both Wash/Rinse button and
Spin Speed button simultaneously, is the water
level frequency below 240?

Is the inlet valve filter clogged?

Is resistance between each terminal of INLET
VALVE ASSEMBLY is 0.8~1.2

kΩ

?

Verify the voltage of the inlet valve connector is

120 V AC.

(Refer to 7-2 QC TEST MODE)

Is water supplied?

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

Is detergent put in the correct compartment of
the dispenser?

Is the detergent caked or hardened?

Open the tap.

Check the AIR CHAMBER
and the tube (clogged).

Clean the filter.

Replace the INLET VALVE

ASSEMBLY.

Check electrical connection.
Replace the MAIN PWB
ASSEMBLY.

Refer to 

NO WATER SUPPLY

Check the wiring.

Put the detergent in the
correct position 

: Detergent 

Clean the dispenser. 

YES

YES

NO

NO

NO

NO

YES

YES

YES

YES

MAX

max

M

A

X

Detergent

for wash

Fabric

softener

Liquid

Bleach

Secure the bolt.

Replace the STATOR
ASSEMBLY or ROTOR
ASSEMBLY.

Refer to

NO WATER SUPPLY

Check the wiring.

Put it in the correct
compartment.

Clean the cap and
container. 

Is the motor bolt loosened?

Is there friction noise coming from the motor?

Is water supplied?

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

Is softener/bleach put in the correct compartment of

the dispenser?

Is the softener/bleach cap clogged?

AC120V

Replace the

SENSOR SWITCH

ASSEMBLY.

Replace the MAIN PWB
ASSEMBLY

Repair the DRAIN HOSE
ASSEMBLY.

Remove foreign material.

Reconnect or repair the
connector

Repair the DRAIN PUMP
ASSEMBLY.

Repair the MAIN PWB
ASSEMBLY.

When pressing Wash/Rinse and Spin Speed at
the same time after draining, is the water level
frequency 255?
When pressing and Spin Speed buttons
at the same time while washing, is the water level
frequency between 230 - 243 ?

Check the voltage between two pins while
pressing the POWER button. Is the voltage 
120 V AC?

Is the drain hose twisted or frozen?

Is the impeller of the drain pump clogged?

Is the connector disconnected  or disassembled.

Is the resistance of the drain pump coil too high or

low? (resistance of the coil is 10-20 Ω)

When checking voltage between connectors

during spin, is the voltage 120 V AC as in the

figure?