Maytag MDB7751AW*, MDB8951AW*, MDBM755AW* Component Readings/Testing, Manual Function Test

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Component Readings/Testing

!WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect power to dishwasher before servicing.

Manual Function Test

Field Service Test

A Manual Function Test may be started by pressing the Heated Dry key 5 times followed by the Start key within 8 seconds.

The Normal Wash LED will Flash 3 times indicating manual test mode is active. Specific keypads will turn on or off a component as follows:

KEY

Function

LED

Hi Temp Wash

Wash Motor

Hi Temp Wash

Delay

Water Inlet Valve

Delay

Heated Dry

Heating Element

Heated Dry

Cycles Select / Normal

 

 

First Press

No Action

Heavy Wash

Second Press

Dispenser

Normal Wash

Third Press

Drain Pump

Light Wash / China Crystal

The test will cancel 120 seconds after the last keypad is pressed. The display (if available) will show ‘99’ until the remaining timeout period is less than 99 seconds. At this point it will countdown until the mode times out, is cancelled, or another key is pressed. To cancel test, press the Start / Cancel keypad.

Diagnostic Tips

To check control, LED’s and components, enter Field Service Test. If control fails to perform sequence as described, and a fault is detected, determine failure as described in the Field Service Test. If a load component failure has been diagnosed, proceed to the Manual Function Test. To check individual load components for proper operation, enter Manual Function Test. Follow test procedure as described. Repair or replace component as needed.

Note: The High Current or Low Current Motor Error may be detected during a wash cycle selected by a consumer. If this happens, the control will go into a 30 second auto restart mode and shut down if the unit is not able to restart the motor.

Membrane Readings

(All Models)

A Field Service Test may be started by pressing the Heated Dry key 6 times followed by the Start key within 8 seconds. This test must be performed with clean water to insure proper sensor performance.

“88” will appear in the display (if available*) and the following sequence of events will occur:

SECONDS

FUNCTIONS / ACTIVE LOADS

106

Vent Wax Motor / Water Valve

5Thermistor check / Turbidity Sensor check & calibration - no loads active.

120

Wash Motor / Vent Wax Motor / Dispenser

180

Wax Motor

Wash Motor / Heater / Vent Wax Motor

120

Drain Pump

4

Water Valve

The time for the Thermistor check / Turbidy Sensor check & calibration may vary slightly.

The Field Service Test will not repeat. The Heavy Wash LED will Flash during the test mode. All Indicator lights (except Heavy Wash) will illuminate. If the dishwasher door is opened during the test, the test sequence will pause, and resume when the door is closed. To cancel the test, press the Start / Cancel keypad.

The control has been designed to test the Sensor, Memory, and Motor. During the Field Service Test, if a fault has been detected, the test will abort any time after the motor current has been checked and 2 or more LED's will begin to Flash. A Memory / Software Check will occur immediately after the test is started. The (Delay / Delay 2 hr) LED and one of the following:

Turbidity Sensor - failure - Hi Temp Wash LED

Thermistor - failure - Heavy Wash LED

Motor - high current - Normal Wash LED

Motor - low current - Light Wash LED

Memory Failure - Heated Dry LED

* On select models

Heavy Wash *

Connector

 

J1

Normal Wash *

 

 

J1

Light Wash / China Crystal / Gentle Wash /

 

 

 

Quick *

 

J1

Rinse Only *

 

 

J1

Auto Clean / Sensor Clean *

 

 

J1

Heated Dry

 

 

J1

Sanitize *

 

 

J1

Hi Temp Wash

 

 

J1

 

 

(Front Only Controls)

Cycle Select *

Connector

 

J1

Start / Cancel

 

J1

Delay

 

J1

Tough Scrub Plus / Super Scrub / Power Scrub *

J1

Tough Scrub / Extra Wash / Hi Temp *

 

J1

Insta Wash *

 

J1

Model ID Jumper *

 

J1

An unpressed switch will read as an open circuit.

A pressed switch will read as 10k . * On select models

Measure Between

Pin 9 - Pin 5

Pin 9 - Pin 6

Pin 9 - Pin 7

Pin 9 - Pin 8

Pin 10 - Pin 5

Pin 11 - Pin 5

Pin 11 - Pin 6

Pin 11 - Pin 8

Measure Between

Pin 9 - Pin 5

Pin 10 - Pin 6

Pin 10 - Pin 7

Pin 10 - Pin 8

Pin 11 - Pin 7

Pin 12 - Pin 5

Pin 12 - Pin 7

Membrane Readings

(Front & Top Controls)

Connector

Measure Between

Insta Wash *

J1

Pin 10 - Pin 6

Tough Scrub Plus / Super Scrub / Power Scrub *

J1

Pin 10 - Pin 7

160° Wash *

J1

Pin 10 - Pin 8

Tough Scrub / Extra Wash / Hi Temp *

J1

Pin 11 - Pin 7

Model ID Jumper *

J1

Pin 12 - Pin 8

Start / Cancel

J3

Pin 9 - Pin 5

Delay

J3

Pin 9 - Pin 6

(Top Only Controls)

 

Connector

Measure Between

Insta Wash *

J1

Pin 10 - Pin 6

Tough Scrub Plus / Super Scrub *

J1

Pin 10 - Pin 7

160° Option

J1

Pin 10 -

Pin 8

Tough Scrub / Extra Wash / Hi Temp *

J1

Pin 11

- Pin 7

Model ID Jumper *

J1

Pin 12

- Pin 6

Start Cancel

J1

Pin 13

-

Pin 12

Delay

J1

Pin 13

-

Pin 14

Load Readings

Heater¹

Measure Between

Result

ST1 (Heater) - ST11 (Dlb Neutral)

16

Wash Motor

ST5 (Motor Common) - ST8 (Motor Main)

3 to 4

Drain Motor

ST6 (Drain) - ST4 (Dlb Line)

25

Dispenser Wax Motor

J6 Pin 3 (Disp) - ST4 (Dlb Line)

2k

Water Valve²

J6 Pin 4 (Inlt) - ST4 (Dlb Line)

1.1k

Thermistor

J5 Pin 1 (Temp) - J5 Pin 4 (Neutral) See Component Info

Notes:

1.This value assumes the high limit thermostat is closed.

2.This value assumes the float switch is closed.

3.Results are approximated values.

16026394

4

July 2005

 

 

©2005 Maytag Services

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Contents Features Dishwasher Technical InformationBenefits ADB3500AW MDB8751AW MDB8951AW MDB7751AWComponent Specifications SpecificationsPower Source DimensionsIllustration Component Test Procedure Component Readings/Testing Manual Function TestElectrical Diagnostics Resistance Check Points and ValuesControl Definition Control Definition/Motor Connectivity YellowMainCycle Chart OFFWiring Diagram

MDB7751AW*, ADB3500AW, MDB8751AW*, MDBM755AW*, MDB8951AW* specifications

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