27” Domestic Dryer

⎯Technical Information

MDE6700A*, MDG6700A*

• Due to possibility of personal injury or property damage, always contact an authorized technician for servicing or repair of this unit.

• Refer to Service Manual 16026446 for detailed installation, operating, testing, troubleshooting, and disassembly instructions.

!

CAUTION

All safety information must be followed as provided in Service Manual 16026446.

!

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

September 2006

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Troubleshooting Procedures

!

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

Will Not Run

Will not start or run:

• All wires are hooked up to their corresponding terminals.

• Dryer is plugged in.

• Blown fuse or circuit breaker.

• Door switch functional...door closed. Check for error code 3 (See Table for code definition).

• Start/Pause rotary selector dial functional.

• Control Board operational.

• Drive motor functional.

• Check motor winding resistance: 2.88ohms between pin #3 and 4, 3.5ohms between pin #4 and 5.

Motor runs/ tumbler will not turn:

• Belt off or broken/damaged.

• Idler tension spring too weak or stretched.

• Idler pulley jammed or stuck.

Runs a few minutes and then stops:

• Lint buildup around drive motor.

• Low voltage present.

• Blower impeller blocked in blower

housing.

• Drive motor - start switch contacts stuck closed.

Blows fuses or trips circuit breaker:

• The amperage readings are at 240 volts. One line will be 24 amps and the other line will be 21 amps.

The neutral line will be at 3 amps. If the above amperages are present, then the house wiring, fuse box or circuit breaker should be suspect.

• Shorted heating element to housing.

• Incorrect wiring or a wire shorting to ground.

• Drive motor winding shorting to ground.

Gas Models

• During ignition the dryer will draw X amps. With the burner ON, the dryer will draw X amps. If the dryer is drawing amperages above this, then the house wiring, fuse box or circuit breaker is suspected to be at fault.

• Igniter harness loose and shorted to base.

• Incorrect wiring or wire shorted to ground.

• Drive motor winding shorting to ground.

Will Not Dry

Will not heat (motor runs):

• Open heating element.

• Hi-Limit trips easily or is open.

• Regulating thermostat trips easily or is open.

• Membrane switch open.

Thermistor.

• Shorted booster coil

• Open

• Bad motor switch ( Neutral supply)

• No power from control ( L1 supply)

Igniter glows - No gas ignition. If the igniter heats up but the main burner flame is not ignited, remove power and using an ohmmeter, check the following:

• Open secondary coil

• Open holding coil

• Open wire harness

• Stuck flame sensor (Stuck closed)

The gas is ignited but the flame goes out. If a normal ignition takes place and after a short while the flame goes out, check for the following:

• Radiant sensor contacts opening

prematurely.

• Weak gas valve coil may open when stressed by higher temperatures.

Hi-Limit venting

• Bad drum seals

Improper drying/clothes wrinkled/ rough texture/long dry time:

• Lint filter is not clean.

• Restriction in exhaust.

• Outside exhaust hood damper door stuck closed.

• Exhaust too long, too many elbows, flex ductwork installed.

• Poor intake air available for the dryer.

• Incorrect tumbler speed. Tumbler belt slipping.

• Blower impeller bound; check for foreign material in blower area.

• Customer overloading dryer.

• Check clothing labels for fabric content and cycle selected.

• Clothes too wet due to insufficient spin out by washer.

Will Not Dry Gas Models

Poor Gas Ignition

When the dryer is operated on a heat setting, the igniter should be energized and burner shall fire within

45 seconds at 120 VAC. The failure of a component in this system will usually be indicated by one of three symptoms:

The igniter does not glow. If the igniter does not heat up, remove power and using an ohmmeter, check the following:

• Open flame sensor

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Troubleshooting Procedures

!

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

Key Press Special

Will Not Shut Off

• Check Membrane Pad.

• Check Electronic Control Board.

• Short in sensor circuit.

Troubleshooting the electronic control circuit:

• Check for miswiring of the electrical connector at the electronic control board.

Noisy and/Or Vibration

• Thumping Check for loose tumbler baffle, rear tumbler roller(s) worn or misaligned, out-of-round tumbler or high weld seam on tumbler.

• Ticking Check for loose wire harness or object caught in blower wheel area.

• Scraping Check for front or rear bulkhead felt seal out of position or worn tumbler front bearings.

• Roaring Check for blower wheel rubbing on blower housing or bad motor bearings.

• Popping or squealing sound. Check for a sticky or frayed belt.

Wrinkle Prevent

Displays “d”

Then rotate the Cycle

Selector Knob

Temperature Key

Start/Pause

Test/Function

Display list of diagnostic codes.

To sequence thru the diagnostic and help codes.

Display software revision number

Start or pause cycle running but remain in diagnostic mode.

Display the number of cycles ago the diagnostic code occurred.

Service Mode

This mode provides Service Personnel the ability to verify the operation of the dryer.

The Service Mode can be implemented at any time, including the middle of a dry cycle. While in the

Service Mode, the Technician can start special diagnostic tests such as a System Check Mode, LED

Switch/Check, Display Software version number and display diagnostic/help code listings.

Enter Service Mode:

Dryer must be on before Service Mode can be entered. Press Chime and Temperature Keys for 3 seconds, or until 3 beeps are heard. The machine will now be in Service Mode. Upon entry into Service

Mode, the Sensor Bar Touch Data is to be displayed.

Exit Service Mode

Press the OFF key to exit Service Mode or repeat the

Chime and Temperature sequence.

Diagnostic Tests

The following table lists the various tests available while in the Service Mode. Before advancing to the next test, the current test running must be terminated.

Press the following keys to access:

System Check Mode

While in Service Mode, pressing the

Time and Wrinkle Prevent keys for 3 seconds, will put the dryer into the System Check mode and "in" will display. The following table lists the various functions based on the keys being pressed.

System Check Mode Table

Key Pressed:

Start/Pause rotary selector dial

Rotate the Cycle Selector

Knob to Delicates

Rotate the Cycle Selector

Knob to Sensor

Dry

Rotate the Cycle Selector

Knob to Wrinkle Control

Rotate the Cycle Selector

Knob to Time Dry

Function

Performed

Cycles the motor on/off.

LED’s and 7 segment display flash.

View current cycle temperature in Celsius.

Segment display is “1” for sensor bar short, “0” for sensor bar open

View current cycle temperature in

Fahrenheit.

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Troubleshooting Procedures

Wrinkle Prevent

!

To avoid risk of electrical shock, personal injury, or death, disconnect power to dryer before servicing, unless testing requires power.

LED/Switch Check

While in Service Mode, pressing the Chime and turns the knob in the opposite direction, the more recent code will be displayed. keys for 3 seconds, will start a

LED/Switch Test. To exit the test at any point, press the same keys again for 3 seconds or press the OFF key to exit Service Mode.

Perform the check by pressing the keys which toggle the LED’s on and off.

All switch pads must be pressed within 5 minutes for this test to pass. PA will be displayed for five (5) seconds once all switch pads have been pressed and this test is completed. Following 10 seconds of inactivity at any point, the test will exit without any display. The Power Off switch pad must be pressed twice within thirty (30) seconds to cancel this test.

WARNING

While a diagnostic code is displayed, if the

Start/Pause button in the center of the Rotary Cycle

Selector is pressed and held, the machine will display the number of cycles ago the diagnostic code occurred. When the Start/Pause button is released, the diagnostic code is again displayed.

Clearing Diagnostic Codes

To clear the diagnostic code list press the Sensor Dry

Level and Time keypads together for 3 seconds while viewing the list. The cycle count for each diagnostic code will be reset to 0, but not the machine cycle count.

Diagnostic Codes

Code Description Trigger Action

Switch Action

Wrinkle Prevent Press once

1

2

Dryer

Thermistor

Short Sensed

Thermistor

Open Sensed

The

Thermistor resistance is very low.

The

Thermistor resistance is very high

Check for:

- Clogged screen.

- Restricted system.

- Check resistance.

Check for: ambient temperature in room (Below

50

º

F/10

º

C).

Adjust Time Press once

Time Press four times twice

Dryness Level

Selector Knob

Press twice

Rotate 1 position

Start Pause Press once

Off Press

Diagnostic Codes

The Diagnostic Codes are identified when the severity level of the abnormality detected is higher and service may be required.

When a problem with the dryer is detected a

Diagnostic Code is assigned, and can be displayed.

The Control Board will not log multiple same codes per cycle; however, it will log as many Diagnostics as possible for the machine to continue running.

Access Diagnostic Codes by entering the Service

Mode and pressing Wrinkle Prevent. A d will be displayed.

Rotate the Cycle Selector Knob in either direction to step through the list of codes one code at a time.

Once an initial direction is selected by the user (either

Clockwise or Counterclockwise), subsequent movements of the knob in the same direction will show older codes. If the user changes direction and

3

4

Door Circuit

Failure

Possible motor transistor error

Invalid state for more than 256 milliseconds

If either motor transistor is seen open or shorted during startup damper is stuck open in wintertime.

- Loose or open wire terminals.

- Check resistance.

Check for:

- Loose or open wire terminals in

Door Sense circuit.

Check for:

- Loose in motor circuit.

- Run

Check Mode and check the motor relay function.

- If relay functions, disregard the diagnostic code.

- If relay does not function, replace machine control board.

RPL 16026540 ©2006 Maytag Services

Troubleshooting Procedures

!

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

Code Description Trigger

8

10

Stuck Key

No Wet Clothes

A key is sensed to be pressed more than

75 seconds, the key shall be assumed to be stuck.

Sensor bar detects no wet clothes while a

Sensor

Dry

Cycle

Action

Run membrane pad check and replace console w/membrane pad if necessary.

Check for:

- Running dryer with no wet clothes in sensor dry cycle

FE dC

Power source frequency

Error

Door Circuit

Failure

Invalid power source frequency

Invalid state for more than

256 milliseconds

Check for:

- Not using regular power source frequency

- Invalid power frequency sense circuit

Check for:

- Loose or open wire terminals in

Door Sense circuit.

Display Fault/Error Codes

Display Description Trigger Action

Taken

- Check for diagnostic code 3 tS Dryer

Thermistor

Short

Sensed

The

Thermistor resistance is very low.

Check for:

- Clogged lint screen.

- Restricted vent system.

- Check

Thermistor resistance.

- Check for diagnostic code 1 hE

Heater Error Invalid heating termperature in running the dryer

Check for:

- Restricted vent system.

- Check

Thermistor resistance. do Door Open Running the dryer with door open

Check for:

- Close the door, and run the dryer

- Loose or open wire terminals in

Door Sense circuit.

- Check for diagnostic code 3

Component Electrical Testing

• Thermistor resistance 10K Ω @ 25°C 77°F

(2P-Blue & Red wire)

• Thermostat 1 resistance < 1Ω (White & Yellow wire)

85¡C ,25A thermal cut-off

• Thermostat 3 resistance < 1Ω (Red & Black wire)

-If resistance is infinity, replace thermostat 3.

• Thermostat 2 resistance < 1Ω (Blue & Black wire)

-If resistance is infinity, replace thermostat 2.

• Heater resistance 10 Ω (Blue & Blue wire)

-If resistance is infinity, replace Heater.

September 2006

©2006 Maytag Services

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Troubleshooting Procedures

!

WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect power to dryer before servicing, unless testing requires power.

Heating Element (Electric)

160

°

C ,25A 127/99

°

C ,25A thermal cut-off HI-limit

240V/5300W

• Measure resistance of the following terminal

1) Door switch knob : open

Terminal : “COM” - “NC” (1-3) : ∞ Ω

Terminal : “COM” - “NO” (1-2) < 1Ω

2) Door switch push : On

• Motor (Electronic & GAS)

Contacts

Function

Start

Run

1M 2M

= Contact closed

Centrifugal Switch (Motor)

3M 5M

Terminal : “COM” - “NC” (1-3) : ∞ Ω

Terminal : “COM” - “NO” (1-2) < 1Ω

125V/10A

Light resistance 80~100 Ω (Violet & gray)

Radiant Sensor (Gas)

Resistance across terminal indicates a closed switch

6M

120V/10W(E12)

• Belt Cut-off S/W

- Lever open : Resistance value < 1Ω

- Lever push : Resistance value

TH2 Hi-Limit (Gas)

Less than 1 ohm

RPL 16026540 ©2006 Maytag Services

Troubleshooting Procedures

!

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

Gas Valve

123

45

Check across terminals #1 and #3 (Booster Coil). 550 ohms

Check across terminals #1 and #2 (Holding Coil).1350 ohms

Check across terminals #2 and #3 (Both coils in series). 1900 ohmsCheck across terminals #4 and #5 (Secondary Coil).1300 ohms

HEATER

240VAC

Heater Input

Blue & Black wire on

Heater Relay

Sensor Bars & temperature sensor check

MOTOR

CN3

120VAC

Motor Input

Brown 1P on Motor relay

& White wire

Sensor Bars - Disconnect harness and test Pink wire Pin 4 to Orange wire Pin 5.

Approx ∞ (infinity) Ω without laundry load, approx 190 Ω ± 10% with wet clo

thes.

CN6 Cycling Thermostat - Disconnect harness and test Blue wire Pin 2 to Red wire Pin 6.

Approx 10 K Ω at 25 °C 77° F.

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©2006 Maytag Services

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Wiring Schematic

!

WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect power to dryer before servicing, unless testing requires power.

16026881

RPL 16026540

8

©2006 Maytag Services

Wiring Schematic

!

WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect power to dryer before servicing, unless testing requires power.

September 2006 9

©2006 Maytag Services

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