Whirlpool WTW4820XQ0 Troubleshooting Guide download pdf (Page 2)

PAGE 2

FOR SERVICE TECHNICIAN’S USE ONLY

DO NOT REMOVE OR DESTROY

ACTIVATING THE SERVICE

DIAGNOSTIC TEST MODES

1. Be sure the washer is in standby mode

(plugged in with all indicators off).

2. Perform the following sequence of

movement using the cycle selector knob.

NOTE: AFTER RESET, sequence “a” through

“e” must be completed within 6 seconds.

RESET - Rotate cycle selector knob

counterclockwise one or more clicks

to clear sequence.

a. Rotate cycle selector knob clockwise

one click and wait ½ second.

b. Rotate cycle selector knob clockwise

one click and wait ½ second.

c. Rotate cycle selector knob clockwise

one click and wait ½ second.

d. Rotate cycle selector knob

counterclockwise one click and

wait ½ second.

e. Rotate cycle selector knob

clockwise one click.

Successful activation of Diagnostic Test

Modes will be indicated by all status

LEDs (except for Lid Locked) ﬂashing

ON and OFF in half-second intervals.

NOTE: LED names may vary between

makes and models.

Legend: = ON = OFF

Figure 2 - Status LEDs ﬂashing ON and OFF

 If the status LEDs do not display as

described above, the sequence may

not have been completed within 6

seconds. Repeat step 2 to ensure this

was not the cause. If still unsuccessful,

see Unsuccessful Entry, page 3.













Fill Wash Rinse Spin Done

0.5 Seconds ON

0.5 Seconds OFF

R

L

L

R

R

R

DIAGNOSTIC GUIDE

Before servicing, check the following:

Make sure there is power at the wall outlet.

Has a household fuse blown or circuit breaker

tripped? Was a regular fuse used? Inform

customer that a time-delay fuse is required.

Are both hot and cold water faucets open

and water supply hoses unobstructed?

All tests/checks should be made with a

VOM (volt-ohm-milliammeter) or DVM

(digital-voltmeter) having a sensitivity of

20,000 Ω per volt DC or greater.

Resistance checks must be made with

washer unplugged or power disconnected.

IMPORTANT: Avoid using large

diameter probes when checking harness

connectors as the probes may damage

the connectors upon insertion.

Check all harnesses and connections before

replacing components. Look for connectors

not fully seated, broken or loose wires and

terminals, or wires not pressed into connectors

far enough to engage metal barbs.

A potential cause of a control not

functioning is corrosion or contamination on

connections. Use an ohmmeter to check for

continuity across suspected connections.

DIAGNOSTIC LED – MAIN CONTROL

A troubleshooting tool has been implemented

onto the main control board—a diagnostic LED.

LED ON – The Control is detecting correct incoming

line voltage and the processor is functioning.

LED OFF – Control malfunction. Perform TEST #1:

Main Control, page 12, to verify main control

functionality.

SERVICE DIAGNOSTIC TEST MODES

These tests allow factory or service personnel

to test and verify all inputs to the main control

board. You may want to do a quick and overall

checkup of the washer with these tests before

going to speciﬁc troubleshooting tests.

LED Location

Figure 1

1 2 3 4 5 6 7 ... 47 48

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