Maytag MVWB850WQ User Manual

NECÈIP1EGAPW10093831A.ONTRAP
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W10093831A
FOR SERVICE TECHNICIAN ONLY – DO NOT REMOVE OR DESTROY POURLETECHNICIEN SEULEMENT – NE PAS ENLEVERNIDÉTRUIRE
■
Check all connections before replacing
components. Look for broken or loose wires, failed
terminals, or wires not pressed into connectors
far enough.
■
A potential cause of a control not functioning
is corrosion or contamination on connections.
Observe connections and check for continuity
with an ohmmeter.
■
Connectors: Look at top of connector. Check for
broken or loose wires. Check for wires not pressed
into connector far enough to engage metal barbs.
■
Resistance checks must be made with washer
unplugged or power disconnected.
DIAGNOSTIC TESTS
There are three diagnostic test modes available:
Automatic, Manual, and Console and Indicators. These
tests allow the factory or service personnel to test
and verify all inputs to the machine/motor control.
You may want to allow the automatic test cycle to
complete prior to going into specific troubleshooting
tests, to verify all washer’s subsystems functionality.
ACTIVATION OF AUTOMATIC
DIAGNOSTIC TEST MODE
1. Be sure the washer is in standby mode (plugged in
with all indicators off) or in setting mode (plugged
in and power up just before running a cycle).
2. Select any one button (except POWER/CANCEL
and START/PAUSE) and follow the steps below,
using the same button:
a. Press/hold 3 seconds.
b. Release for 3 seconds.
c. Press/hold 3 seconds.
d. Release for 3 seconds.
e. Press/hold 3 seconds.
➔
If this test mode has been entered successfully,
all indicators on the console are illuminated for
5 seconds with
8:88 showing in the Estimated
Time Remaining three-digit display.
➔
If indicators do not display as described above,
the press/hold/release procedure above may not
have been performed within the time frame
necessary for successful entry. Repeat step 2
to ensure this was not the cause. If still
unsuccessful, see Diagnostic: Unsuccessful
Entry, at right.
3. The test sequence continues by checking for saved
fault codes:
➔
If there are saved fault codes, see Diagnostic:
Saved Fault Codes, page 2.
➔
If there are no saved fault codes, all indicators
on the console will momentarily turn off, then
turn back on with
8:88 displayed. After
5 seconds, the Automatic test, below, begins.
DIAGNOSTIC: Automatic
Performs a five-minute automatic test with water
functions to check major washer functions (lid can be
open). Press the same button used in step 2 above to
advance through automatic test steps.
NOTE: Basket must be floating in order to agitate.
Step C1 must be allowed to complete before
advancing to step C5.
Three-Digit
Indicator
Washer
Function
Recommended
Procedure
C0
Slow spin to
23 rpm.
If no spin, go to
Manual: Motor, Spin
test, page 2.
Three-Digit
Indicator
Washer
Function
Recommended
Procedure
C1
Warm water fills
through Fresh
and Detergent
valves, then
Fresh valve until
basket floats
(disengages);
then washer
continues filling
through Fresh
and Detergent
valves to
minimum water
level.
If no water, or fill
temperature is wrong, go
to Manual: Water Valves
test, page 2.
If basket does not float
or disengage, determine
cause of friction.
C2
Cold water fills
through Bleach
valve for 10
seconds. Then,
Hot water fills
through Oxi valve
for 10 seconds.*
If no water in bleach or
Oxi cup, go to Manual:
Water Valves test, page 2.
C3
Hot water fills
through Fabric
Softener valve
for 10 seconds.
If no water in fabric
softener cup, go to
Manual: Water Valves
test, page 2.
C4
Warm water fills
through
Detergent valve
for 10 seconds.
If no water in detergent
cup, go to Manual: Water
Valves test, page 2.
C5
Heater turns on
for 5 seconds.
♦
Test the heater element
as described in
TEST #9, page 6.
C6
Agitate for
15 seconds.
If no wash action, go to
Manual: Motor, Agitate
test; page 2.
C7
Recirculate for
10 seconds.
If water is not being
recirculated, go to Manual:
Pumps test, page2.
C8
Drain to basket
engaged plus
timed drain for
10 seconds.
If water is not draining,
go to Manual: Pumps
test, page 2.
If basket does not engage,
determine cause of friction.
C9
Drain & Slow
spin 23 rpm for
5 seconds, then
coast to 0 rpm.
If drain pump is not on,
go to Manual: Pumps
test, page 2.
If basket is not turning,
go to Manual: Motor test,
page 2.
If basket does not stop
spinning within 10
seconds,pressPOWER/
CANCEL and restart test.
(none)
(Test
ends)
End of Cycle
beep.
If no end of cycle beep,
make sure cycle signal
is on before entering
service diagnostic mode.
♦C5 will be displayed but no action will be taken on
non-heater models.
DIAGNOSTIC: Unsuccessful Entry
If entry into diagnostic mode is unsuccessful (see steps
1and2ofActivationofAutomatic DiagnosticTestMode,
at left), refer to the following indications and actions:
Indication 1: None of the indicators or display
turns on.
Action:
Press POWER/CANCEL to enter setting mode.
➔
If indicators come on, try to change the function
for the button used to activate the diagnostic test
mode. If that button fails to change the function,
IMPORTANT
Electrostatic Discharge (ESD) Sensitive
Electronics
ESD problems are present everywhere. ESD may
damage or weaken the electronic control assembly.
The new control assembly may appear to work well
after repair is finished, but failure may occur at a later
date due to ESD stress.
■
Use an anti-static wrist strap. Connect wrist strap
to green ground connection point or unpainted
metal in the appliance -OR- Touch your finger
repeatedly to a green ground connection point or
unpainted metal in the appliance.
■
Before removing the part from its package, touch
the anti-static bag to a green ground connection
point or unpainted metal in the appliance.
■ Avoid touching electronic parts or terminal
contacts; handle electronic control assembly by
edges only.
■ When repackaging failed electronic control
assembly in anti-static bag, observe above
instructions.
WARNING
E
lectrical Shock Hazard
Disconnect power before
servicing.
Replace all parts and
panels before operating.
Failure to do so can result
in death or electrical shock.
4,693,095
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D381,140
D423,740
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D502,577
D511,955
SOFTWARE COPYRIGHTED. MANUFACTURED UNDER ONE OR MORE OF
THE FOLLOWING U.S. PATENTS:
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? Use a time-delay fuse.
■
Are both hot and cold water faucets open and water
supply hoses unobstructed?
■
Alltests/checks shouldbemadewithaVOM(volt-ohm-
milliammeter) or DVM(digital-voltmeter) havinga
sensitivity of 20,000 Ω per voltDCorgreater.
NOTE: Avoid using large diameter probes when
checking harness connectors as the probes may
damage the connectors upon insertion.
C2: A 10 second pause will be observed for models
without an Oxi dispenser.
*

Maytag MVWB850WQ Specifications

General

Brand	Maytag
Model	MVWB850WQ
Type	Top Load Washer
Capacity	4.3 cu. ft.
Color	White
Energy Star Certified	Yes
Wash Cycles	11
Control Type	Electronic
Depth	27 in
Agitator	Yes
Spin Speed	700 RPM
Width	27 in

Summary

Electrical Safety Warnings

Electrical Shock Hazard

Warning about disconnecting power before servicing to prevent death or shock.

ESD Precautions

Electrostatic Discharge (ESD) Sensitive Electronics

Guidance on handling ESD sensitive electronic components to prevent damage.

Diagnostic Guide

Pre-Servicing Checks

Checks to perform before servicing, including power, fuses, and water supply.

Automatic Diagnostic Test

Automatic Test Mode Activation

Steps to activate the automatic diagnostic test mode by pressing specific buttons.

Running the Automatic Test

Procedure for running the automatic 5-minute diagnostic test for washer functions.

Unsuccessful Diagnostic Entry

Troubleshooting for when diagnostic mode entry fails, with specific indications and actions.

Saved Fault Codes

Accessing Saved Fault Codes

How saved fault codes are displayed and accessed within diagnostic mode.

Manual Diagnostic Test

Manual Test Activation

Steps to activate manual diagnostic mode by pressing buttons after automatic mode entry.

Water Valves Test

Procedure to test the washer's water inlet valves for fresh, detergent, softener, bleach, and oxi.

Pumps Test

Procedure to test the washer's recirculation and drain pumps.

Lid Lock Test

Procedure to test the washer's lid lock mechanism and switch.

Motor Test

Procedure to test the motor, including rotor position sensor and spin/agitate functions.

Heater Test

Procedure to test the washer's heater element, if equipped.

Console and Indicators Diagnostic

Console/Indicators Test Activation

Steps to activate the diagnostic test for console buttons, indicators, and display.

Display Fault and Error Codes

Long Fill Fault (LF)

Indicates water level not changing or not detected by control.

Long Drain Fault (Ld)

Indicates water level not changing after drain pump activation.

Unbalanced Load Fault (uL)

Indicates an off-balance load detected by the control.

Overloaded Fault (oL)

Indicates a load size exceeding capacity or basket disengagement failure.

Suds Detection Fault (Sd)

Indicates a suds-lock condition detected by the control.

Open/Close Lid Fault (Id)

Indicates issues with lid switch detection or user interaction.

Pump Out (lid opened) Fault (Po)

Indicates drain pump activation due to lid left open.

Hot, Cold Reversed Fault (HC)

Indicates inlet hoses are connected incorrectly.

Lid Lock Failure Fault (dL)

Indicates failure of the lid to lock completely.

Lid Unlock Failure Fault (du)

Indicates failure of the lid to unlock.

Pressure Signal Out-of-Range Fault (F then 1)

Indicates control detects an out-of-range pressure signal.

Keypad/User Interface Failure Fault (F then 2)

Indicates a stuck key or internal UI problem.

Communication Error Fault (F then 36)

Indicates communication failure between CCU and UI.

ATC Thermistor Open/Short Fault (F then 40)

Indicates ATC thermistor is open or shorted.

Motor RPS Thermistor Open/Short Fault (F then 41)

Indicates motor RPS thermistor is open or shorted.

Heater in Unknown State Fault (F then 42)

Indicates control cannot detect heater ON/OFF status.

Heater Continuously ON Fault (F then 43)

Indicates heater is ON when it should be OFF.

Heater Cannot Be Turned ON Fault (F then 44)

Indicates heater is ON but control cannot detect it.

Motor Stalled Fault (F then 50)

Indicates motor rotor position sensor detects no rotation.

Motor RPS Failure Fault (F then 51)

Indicates motor RPS failure or harness problem.

Motor Stop Failure Fault (F then 52)

Indicates motor RPS senses rotation after stop command.

Motor Control Specific Faults

Motor Control Overtemp Fault (F then 53)

Indicates high temperature detected for the motor module.

Motor Control Overcurrent Fault (F then 54)

Indicates high current detected for the motor module.

Basket Re-engagement Failure Fault (F then 72)

Indicates failure to determine basket re-engagement after disengagement.

Troubleshooting Guide: Common Problems

Won't Power Up

Troubleshooting steps for when the washer does not respond to button presses.

Won't Start Cycle

Troubleshooting steps for when the START/PAUSE button does not initiate a cycle.

Won't Accept Selections

Troubleshooting for when the control does not accept input selections.

Won't Dispense

Troubleshooting steps for when the washer does not dispense water or detergent.

Won't Fill

Troubleshooting steps for when the washer fails to fill with water.

Over Fills

Troubleshooting steps for when the washer overfills with water.

Won't Agitate

Troubleshooting steps for when the washer does not agitate.

Won't Spin

Troubleshooting steps for when the washer does not spin.

Won't Drain

Troubleshooting steps for when the washer fails to drain.

Incorrect Water Temperature

Troubleshooting for incorrect water temperature during cycles.

All Hot Fills

Troubleshooting for when all fills result in hot water.

Won't Water Recirculate

Troubleshooting for when the washer does not recirculate water.

Display Flashing Guidance

General guidance for flashing displays, referring to fault codes.

Factory Default Reset

Procedure to reset cycle settings to factory defaults.

Diagnostic Test Procedures

Test #1 Supply Connections

Checks electrical connections to the machine/motor control and power cord continuity.

Test #2 Log Valve

Tests electrical connections to water valves and valve resistance.

Test #3 Motor Circuit

Checks wiring to motor and RPS, and tests motor and RPS components.

Test #4 Console and Indicators

Tests console electronics, indicators, buttons, and beep sound functionality.

Test #5 Automatic Temperature Control

Checks water inlet valves, temperature sensor, and machine/motor control for temperature accuracy.

Test #6 Water Level & Pressure Calibration

Tests water level sensing components and calibrates the pressure sensor.

Advanced Diagnostic Tests

Test #7 Drain/Recirculation

Checks pump motor windings and connections for drain/recirculation failures.

Test #8 Lid Lock

Checks lid lock motor winding, switches, and resistance for lock/unlock failures.

Test #9 Heater Element

Checks heater element resistance and connection to the heater relay board.

Test #10 Communication Failures

Troubleshoots communication issues between the UI and machine/motor control.

Electronic Assemblies Procedures

Accessing Electronic Assemblies

Steps for accessing the machine/motor control and user interface assemblies.

Removing Machine/Motor Control Assembly

Procedure for removing the machine/motor control assembly from the console tray.

Removing User Interface PCA

Procedure for removing the user interface printed circuit assembly board.

Reinstalling User Interface PCA

Guidance for reinstalling the user interface printed circuit assembly board.

Wiring Diagram

Component Wiring Details

Diagram showing electrical connections between components like motor, pumps, valves, and controls.