Diagnostic Led, Diagnostic Test Modes; Diagnostic Guide; Fault Code Display Mode - Whirlpool MVWC400XW Technical Education

FOR SERVICE TECHNICIANS ONLY

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
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, on page 12, to verify main control to verify main control functionality.
functionality.
LED Location
Figure 2
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.

FAULT CODE DISPLAY MODE

To access fault/error codes, perform steps
1 and 2 of Activating the Service Diagnostic
Modes. Turn the cycle selector knob until the
status LED's or display correspond as follows:
 "Done" LED On, "
Sensing Soak
Press the START button to enter Fault Code
Display Mode.
1. To view last 4 fault codes:
Turn cycle selector knob clockwise to view

fault codes in the order of most recent to
oldest. (Refer to Fault/Error Code charts
on pages 6 & 7.)
NOTE: A fault/error code will be removed
deform
from memory if it does not reoccur after
10 consecutive wash cycles.
2. To clear fault codes:
Turn cycle selector knob until the status

LED's correspond as follows:
Sensing Soak
Press and hold START button for

3 seconds to clear all fault codes.
Fault/Error Code Display Method
Fault/error codes are displayed by alternating
the state of the Status LED's and display (if
display exists) in one-second intervals. All fault/
error codes have an F# and an E#. The F#
indicates "Type of Fault" and the E# indicates
"Component system where fault is located."
*If the Sensing LED is ON, the Fault Number
is represented; if OFF, the Error Number is
represented (see example below). The remaining
LED's (Wash, Rinse, Spin, and Done) represent
the fault and error code. (See Fault/Error Code
See Fault/Error Code Charts for more information.)
Charts on pages 6 & 7 for more information.)
FAULT NUMBER
Status LEDs
On
NOTE: LED names will vary on selected models.
5-3
01
" Displayed on 7-segment
Wash Rinse Spin
Wash Rinse Spin
ERROR NUMBER
Status LEDs
F3
f3
On On On On
01
Done
)
Done
F4
e3