Maytag MVWB850YG0 Mode D'emploi page 6

FOR SERVICE TECHNICIAN ONLY – DO NOT REMOVE OR DESTROY
TEST #7 Drain/Recirculation
Perform the following checks if washer fails to drain
or recirculate.
1. See Activation of Manual Diagnostic Test Mode,
page 2 and perform the Manual: Pumps test.
2. Remove the console to access the machine/motor
control assembly. See Accessing & Removing the
Electronic Assemblies, page 6.
3. Visually check that the P4 connector is inserted all
the way into the machine/motor control.
If visual check passes, go to step 4.
If visual check fails, reconnect P4 and repeat step 1.
4. Remove connector P4 from the machine/motor
control and check resistance values of pump motor
windings. Resistance values should match those
shown in wiring diagram, page 16.
If resistance values are good, go to step 7.
If winding measurements are much higher (tens
of ohms to infinity) than shown in wiring diagram,
a problem exists in the pump motor winding or
in the connection between the machine/motor
control and the pump. Go to step 5.
5. Tilt washer forward to access the bottom of the
washer and the pumps. See figure 1, page 14.
6. Check the resistance at the pump motor. Remove
the connector at the motor and take measurements
across pump terminals. Measurements should be
as shown in the wiring diagram.
If winding measurements are much higher (tens
of ohms to infinity) than shown in wiring diagram,
replace the pump motor.
If the resistance at the pump motor is correct,
there is an open circuit in the wiring between the
motor and the machine/motor control. Repair or
replace the lower wiring harness.
If the pump motor windings and machine/motor
control check OK, repair or replace the pump. Be
sure to check the pump and tub sump for foreign
objects before replacing pump.
7. See Activation of Manual Diagnostic Test Mode,
page 2 and perform the Manual: Pumps test.
8. If the Manual: Pumps test failed, then the
machine/motor control has failed:
Unplug the washer or disconnect power.
Replace the machine/motor control assembly.
Perform the Manual: Pump test on page 2.
TEST #8 Lid Lock
Perform the following checks if washer fails to lock
(or unlock).
1. Perform Manual: Lid Lock test on page 2.
2. Remove the console to access the machine/motor
control assembly. See Accessing & Removing the
Electronic Assemblies, at right.
3. Visually check that the P12 connector is inserted
all the way into the machine/motor control.
If visual check passes, go to step 4.
If visual check fails, reconnect P4 and repeat step 1.
4. Check the lid lock motor winding and switches by
removing P12 from the machine/motor control and
checking the resistance values shown in the
following Lid Lock Resistance table:
P A R T N O . W10403990A
POUR LE TECHNICIEN SEULEMENT – NE PAS ENLEVER NI DÉTRUIRE
LID LOCK RESISTANCE
Resistance Resistance
Component
Unlocked Locked
35 Ω 35 Ω
Motor
(±5 Ω) (±5 Ω)
Winding
Lock Switch - Open
0 Ω
Home Circuit
Lock Switch- Open
0 Ω
Lock Circuit
Lid Closed = 0 Ω
Lock Switch -
Lid Lid Open = Open Circuit
If resistance values are good, go to step 5.
If switch measurements do not match the values
shown in the table for unlocked (or locked)
condition, a problem exists in the lid lock.
Replace the lid lock.
5. If the Manual: Lid Lock test in step 1 failed,
the lock may be stuck or the lock is defective.
Unplug washer or disconnect power.
Replace Lid Lock Assembly.
Repeat the Manual: Lid Lock test on page 2
to verify repair.
TEST #9 Heater Element
(If supplied)
Perform the following checks to ensure the heater
is functioning properly.
1. Unplug washer or disconnect power.
2. Remove the heater terminal plastic cover. See
figure 3, page 14.
3. Check the connection to the water heater element.
4. Check resistance of heater element if present on this
model (abnormal = infinity).
5. If resistance is infinite, replace heater element and
reinstall heater terminal plastic cover.
6. Visually inspect that the connector on the machine/
motor control (P14) that plugs into the lower harness
is correctly installed (See wiring diagram, page 16).
If visual check passes, go to step 7.
If visual check fails, reconnect cable.
7. If connections are correct, replace the machine/
motor assembly.
TEST #10 Communication Failures
Perform the following checks if the washer displays
F36 errors and stops the cycle.
1. Unplug washer or disconnect power.
2. Remove the console to access the machine/motor
control assembly. See Accessing & Removing the
Electronic Assemblies, at right.
3. Visually check that the P7 connector is inserted
all the way into the machine/motor control.
If visual check passes, go to step 4.
If visual check fails, reconnect P7.
4. Plug in washer or reconnect power.
5. Select POWER/CANCEL wash cycle NORMAL
POWER/CANCEL.
If the washer starts the cycle and updates the
7 segment display, communication between the
user interface and the machine/motor control
is operating.
If the washer does not start, go to step 6 or 7
if the user interface has already been replaced.
P A G E 6
6. Replace the user interface assembly and repeat step 5.
See Reinstalling the User Interface Printed Circuit
Contacts
Assembly Board.
Measured
7. Replace the machine/motor control and repeat step 5.
P12-2 P12-3
See Accessing & Removing the Electronic Assemblies.
P12-4
ACCESSING & REMOVING THE
ELECTRONIC ASSEMBLIES
P12-1 P12-7
There are two electronic assemblies: the machine/motor
control assembly and the user interface assembly. See
P12-5
figures 4 and 5 on page 15.
Accessing the Electronic Assemblies
1. Unplug washer or disconnect power.
2. Remove three screws from the rear of the console
assembly. Pull console toward front of washer to
hinge open and/or remove console.
Removing the Machine/Motor Control
Assembly
3. Remove all the wire connections to the
machine/motor control.
4. Remove the one screw holding the machine/motor
control assembly to the console tray.
5. There are two plastic legs on the rear of the
machine/motor control assembly that fit into the
console tray. Lift the front of the control assembly
to pivot it out from the console tray.
Removing the User Interface Printed Circuit
Assembly Board
NOTE: Before removing the PCA, it should be verified
that the console assembly has been electrically
disconnected from the washer by detaching the
wide communication harness from the CCU.
3. Remove the wash cycle selector knob by pulling
on it firmly.
4. Using a Phillips head screwdriver, remove the five
screws that secure the rear cover in place.
5. There are four tabs located at the top of the rear
cover that help to hold and locate the cover in position.
The cover may be removed by lifting up on it toward
the bottom. The cover should pivot up and slide out.
6. The PCA may now be removed by applying gentle
pressure to the encoder from the outside of the
console.
Reinstalling the User Interface Printed
Circuit Assembly Board
1. Refer to preceding removal sections and replace
in reverse order.
2. Plug in washer or reconnect power.
NOTE: When reconnecting wire connections, route wires
as shown in figure 4, page 15. Be sure to route wires
beneath the retainer clips on the machine/motor control,
and ensure user interface assembly wire does not get
pinched between the console assembly and the console
tray when reassembling top.
NOTE: Ensure the console gasket is in place when
reinstalling the console.
o
P È I C E N W10403990A