Troubleshooting Guide; Troubleshooting Tests; Supply Connections; Motor Circuit - Maytag MVWB850WQ Service Manual

FOR SERVICE TECHNICIAN ONLY – DO NOT REMOVE OR DESTROY
EXPLANATION AND
Display
(Saved
RECOMMENDED PROCEDURE
Code)
Motor Control Overtemp
F then 53 flashes when the machine/motor
control detects high temperature for the motor
module.
Does basket turn freely? If not, determine
cause of friction.
If basket turns freely, see TEST #3, at right.
Motor Control Overcurrent
F then 54 flashes when the machine/motor
control detects high current for the motor
module.
Does basket turn freely? If not, determine
cause of friction.
If basket turns freely, see TEST #3, at right.
Basket Re-engagement Failure
F then 72 flashes when the basket check
routine fails to determine if the basket is
re-engaged after being disengaged.
Is the basket floating? if yes, pump out
water. See Long Drain (Ld) procedure.
Does basket turn freely? If not, determine
cause of friction.

TROUBLESHOOTING GUIDE

POSSIBLE CAUSE/TEST
NOTE: Possible Cause/Test must
PROBLEM
be performed in the sequence
shown for each problem.
WON'T POWER UP
(No response
1. Supply connections. See
when buttons are
TEST #1, at right.
pressed.)
2. Unplug washer or disconnect
power.
WON'T START
3. Check harness connections.
CYCLE
4. User interface assembly. See
(No response when
TEST #4, page 5.
START/PAUSE
button is pressed.)
1. User interface assembly. See
WON'T SHUT
TEST #4, page 5.
OFF WHEN
EXPECTED
2. Lid switch. See TEST #8, page 6.
CONTROL
User interface assembly. See
WON'T ACCEPT
TEST #4, page 5.
SELECTIONS
1. Check water connections to
WON'T
washer.
DISPENSE
2. Check for plugged screen in
water source.
3. Log valve. See TEST #2, at right.
WON'T FILL 1. Check water connections to
washer.
2. Check for plugged screen in
water source.
3. Log valve. See TEST #2, at right.
4. Unplug washer or disconnect power.
5. Check harness connections.
OVER FILLS 1. Unplug washer or disconnect
power.
2. Check pressure hose connections.
3. Check to see if the pressure
hose has a hole, is pinched or
plugged.
4. Water level and calibration.
See TEST #6, page 5.
P A R T N O . W 10093831A
POUR LE TECHNICIEN SEULEMENT – NE PAS ENLEVER NI DÉTRUIRE
POSSIBLE CAUSE/TEST
NOTE: Possible Cause/Test must
PROBLEM
be performed in the sequence
shown for each problem.
WON'T AGITATE 1. Make sure basket is floating
(see Manual: Motor, page 2).
2. Unplug washer or disconnect
power.
3. Check harness connections.
4. Lid switch. See TEST #8, page 6.
5. Motor. See TEST #3, at right.
1. Lid switch. See TEST #8, page 6.
WON'T SPIN
2. Unplug washer or disconnect
power.
3. Check harness connections.
4. Motor. See TEST #3, at right.
WON'T DRAIN 1. Check drain hose installation.
2. Check for plugged drain hose.
3. Drain pump. See TEST #7, page 6.
1. Check for swapped water
INCORRECT
connections to washer.
WATER
TEMPERATURE 2. ATC (Automatic Temperature
Control). See TEST #5,
page 5.
ALL HOT FILLS 1. ATC thermistor stuck in high
resistance range.
2. ATC (Automatic Temperature
Control). See TEST #5, page 5.
WON'T 1. Unplug washer or disconnect
power.
RECIRCULATE
WATER
2. Check for plugged recirculation
hose.
3. Check for leaks in recirculation
system.
4. Recirculation pump. See
TEST #7, page 6.
DISPLAY IS
See Display Fault/Error Codes,
FLASHING
page 3.
HOW TO 1. Press POWER/CANCEL, then
select Drain & Spin cycle.
RETURN CYCLE
SETTINGS TO
2. Press EXTRA RINSE, FABRIC
FACTORY SOFTENER, EXTRA RINSE,
DEFAULTS FABRIC SOFTENER within 5
seconds. When done correctly,
the 7-segment display shows
"Fd" for 3 seconds, and then
washer returns to Standby Mode.

TROUBLESHOOTING TESTS

TEST #1 Supply connections
This test assumes that proper voltage is present at the
outlet.
1. Unplug washer or disconnect power.
2. Access the machine/motor control assembly. See
Accessing & Removing the Electronic Assemblies,
page 6.
3. With an ohmmeter, check for continuity between the
neutral (N) terminal of the plug and P13-1 on the
machine/motor control. See figures 4 and 5, page 15.
If there is continuity, go to step 4.
If there is no continuity, replace the power cord.
4. In a similar way, check the continuity between the L1
terminal of the plug and P13-3 on the machine/motor
control. See figures 4 and 5, page 15.
If there is continuity, go to step 5.
If there is no continuity, replace the power cord.
P A G E 4
5. Visually check that the P13 connector is inserted all
the way into the machine/motor control. If this is a
heater model, verify that the power cord is plugged
into the Heater relay board and that the Control line
from the Heater relay board to P13 is inserted all
the way in; see wiring diagram on page 16.
6. Visually check that the user interface assembly cable
is properly inserted into P7 port of the machine/
motor control.
7. If both visual checks pass, replace the user interface
assembly. See Reinstalling the User Interface Printed
Circuit Assembly Board, page 6.
8. Plug in washer or reconnect power.
9. Follow procedure under Activation of Console and
Indicators Diagnostic Test mode, page 2, to verify repair.
10. If indicators still do not light, the machine/motor
control has failed:
Unplug washer or disconnect power.
Replace the machine/motor control assembly.
Plug in washer or reconnect power.
TEST #2 Log Valve
This test checks the electrical connections to the valves,
and the valves themselves.
1. Check the relays and electrical connections to the
valves by performing the steps under Diagnostic:
Manual, then Manual: Water Valves, page 2. Each
step in the test activates a group of valves. The
following steps assume one (or more) valve(s)
failed to turn on.
2. For the valve(s) in question check the individual
solenoid valves:
Unplug washer or disconnect power.
Disconnect connector P1 and P2 from the
machine/motor control. See figure 5, page 15.
3. Check resistance of valve coils at contacts P1 and P2
shown in the wiring diagram on page 16. Resistance
should be between 790–840 Ω.
If resistance readings are tens of ohms outside of
range, replace the entire log valve assembly.
If resistance readings are within range, replace the
machine/motor control assembly.
4. Reconnect connectors P1 and P2 to the machine/
motor control.
TEST #3 Motor Circuit
This test checks the wiring to the motor and rotor
position sensor, and the motor and rotor position sensor
themselves.
NOTE: Drain water from tub.
1. See Activation of Manual Diagnostic Test Mode,
page 2 and check the motor and electrical
connections by performing the Spin test under
Manual: Motor, page 2. The following steps assume
that this step failed.
2. Unplug washer or disconnect power.
3. Check to see if basket will turn freely.
If basket turns freely, go to step 4.
If basket does not turn freely, determine what is
causing the mechanical friction or lock up.
4. Remove the console to access the machine/motor
control assembly. See Accessing & Removing the
Electronic Assemblies, page 6.
5. Visually check that the P5 and P10 connectors are
inserted all the way into the machine/motor control.
If visual checks pass, go to step 6.
If visual checks fail, reconnect P5 and P10 and
repeat step 1.
P È I C E N
o
W10093831A