Maytag MVWB835DW - Troubleshooting Tests: Main Control and Connectors; Test #1: Main Control (ACU); Main Control Board Connectors

PAGE 14
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
TROUBLESHOOTING TESTS
IMPORTANT: Whenever the washer is tilted for
service or troubleshooting, drain water from the
basket and remove any load items in the basket.
TEST #1: Main Control (ACU)
This test checks for incoming and outgoing power
to and from main control. This test assumes that
proper voltage is present at the outlet.
1. Unplug washer or disconnect power.
2. Remove console to access main control.
3. Verify that ALL connectors are inserted
all the way into the main control.
4. Plug in washer or reconnect power.
5. With a voltmeter set to AC, connect black
probe to J12-3 (Neutral) and red probe to J12-1 (L1).
If 120VAC is present, go to step 6.
 If 120VAC is not present, check the AC power
cord for continuity (See Figure 8, page 22.)
Main Control (ACU)
Board Connectors
and Pinouts
(Figure 2)
J2 Valves &
Thermistor
Diagnostic LED
J1 Motor
J5 Heater Element
6. Is the “Diagnostic LED” flashing or
continuously ‘ON’ or ‘OFF’? (See Figure 2
below for LED location.)
Flashing: (+5VDC present and micro
operating) proceed to Key Activation &
Encoder Test, page 3.
ON: (+5VDC present but micro failure)
continue to step 9.
OFF: (+5VDC missing or micro failure)
proceed to step 7.
7. Check if console UI is affecting the main
control DC supply.
a. Unplug washer or disconnect power.
b. Remove connector J18 from main control.
c. Plug in washer or reconnect power.
d. Recheck the Diagnostic LED per step 6.
If the diagnostic LED is now flashing, go
to Test #4: Keys and Encoders, “None of the
indicators light up”, step 4, page 17. If diagnostic
LED is not flashing, continue to step 8.
J1 Motor
J1-6
Shield HF Return
J1-5 Open
J1-4 Blk VS3
J1-3 Brn VS1
J1-2 Open
J1-1 Red VS2
J2 Valves & Thermistor
J2-12 Open
J2-11 Open
J2-10 Blu Cold Valve
J2-9 Red Hot Valve
J2-8 Vlt Oxi Valve (not
on all models)
J2-7 Orn Softener Valve
J2-6 Open
J2-5 Open
J2-4 Wht Neutral
J2-3 Open
J2-2 Blk Valve Thermistor
J2-1 Blk Rtn (VSS)
J4 Pumps & Shifter
J4-7 Orn Shifter
J4-5 Lt Blu Recirc. Pump (not on all models)
J4-3 Blu Drain Pump
J4-1 Wht Neutral
J5 Heater Element
J5-2 Gry Neutral
J5-1 Blk L1
J6 Lid Lock
J6-7 Red Lock Sw
J6-6 Open
J6-5 Grn Lid Sw
J6-4 Blu Home Sw
J6-3 Blk Lock Motor
J6-2 Brn Lock Motor
J6-1 Wht Sw Out
J18 UI
J18-3 Blk Rtn (VSS)
J18-2 Blu Wide
J18-1 Yel +5VDC
J12 Power Cord
J12-3 Wht Neutral
J12-2 Grn Ground
J12-1 Blk L1
UI

POWER
CORD

LID LOCK

MOTOR

VALVES & THERMISTOR

PUMPS &
SHIFTER

HEATER
ELEMENT

J4 Pumps
& Shifter
J6 Lid
Lock
J18 User
Interface
J12 Power Cord


= Pin 1





