Maytag MDE6700A, MDG6700A Technical Information

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.

!

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

WARNING

September 2006 16026881

©2006 Maytag Services RPL 16026540

1

Troubleshooting Procedures

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.

• Check Thermistor.

September 2006 16026881

©2006 Maytag Services RPL 16026540

!

WARNING

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

• Open igniter

• Shorted booster coil

• Open wiring

• 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.

• Weak Hi-Limit

• Poor 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.

2

Troubleshooting Procedures

!

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

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.

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:

WARNING

Key Press Special

Wrinkle Prevent

Displays “d”
Then rotate the Cycle

Selector Knob

Temperature Key

Start/Pause

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: Function

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

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.

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.

September 2006 16026881

©2006 Maytag Services RPL 16026540

3

Troubleshooting Procedures

!

WARNING

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
Wrinkle Prevent 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.

Switch Action

Wrinkle Prevent Press once
Chime Press once
Adjust Time Press once
Time Press four times
Temperature Press twice
Dryness Level Press twice
Selector Knob Rotate 1 position
Start Pause Press once
Off Press once

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

turns the knob in the opposite direction, the more
recent code will be displayed.

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 Taken

Dryer

1

Thermistor
Short Sensed

Thermistor

2

Open Sensed

Door Circuit

3

Failure

Possible motor

4

transistor error

The
Thermistor
resistance is
very low.

The
Thermistor
resistance is
very high

Invalid state
for more
than 256
milliseconds

If either
motor
transistor is
seen open or
shorted
during
startup

Check for

- Clogged lint

screen.

- Restricted vent
system.

- Check Thermistor
resistance.

Check for

- Low ambient
temperature in
room (Below

ºF/10ºC).

50

- Outside vent
damper is stuck
open in wintertime.

- Loose or open
wire terminals.

- Check Thermistor
resistance.

Check for

- Loose or open
wire terminals in
Door Sense
circuit.

Check for

- Loose connections
in motor circuit.

- Run System
Check Mode and
check the motor
relay function.

- If relay functions,
disregard the
diagnostic code.

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

show older codes. If the user changes direction and

:

:

:

:

16026881 September 2006
RPL 16026540

4

©2006 Maytag Services

Troubleshooting Procedures

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

Code Description Trigger Action Taken

Stuck Key A key is

8

10

No Wet Clothes

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

Display Fault/Error Codes
Display Description Trigger

Dryer
Thermistor

tS

Short
Sensed

do

Door Open Running the

The
Thermistor
resistance is
very low.

dryer with
door open

September 2006 16026881

©2006 Maytag Services RPL 16026540

!

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

WARNING

Check for:

- Running dryer
with
no wet clothes in
sensor dry cycle

Action
Taken

Check for:

- Clogged
lint
screen.

- Restricted
vent
system.

- Check
Thermistor
resistance.

- Check for
diagnostic
code 1

Check for:

- Close the
door,
and run the
dryer

- Loose or
open
wire
terminals in
Door Sense
circuit.

- Check for
diagnostic
code 3

FE

Power
source
frequency
Error

Invalid
power
source
frequency

Check for:

- Not using
regular
power
source
frequency

- Invalid
power
frequency
sense
circuit

dC

Door Circuit
Failure

Invalid state
for more
than
256
milliseconds

Check for:

- Loose or
open
wire
terminals in
Door Sense
circuit.

- Check for
diagnostic
code 3

hE

Heater Error Invalid

heating
termperature
in running
the
dryer

Check for:

- Restricted
vent
system.

- Check
Thermistor
resistance.

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.

5

Troubleshooting Procedures

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

thermal cut-off

• 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

Terminal : “COM” - “NC” (1-3) : ∞ Ω
Terminal : “COM” - “NO” (1-2) < 1Ω

Light resistance 80~100 Ω (Violet & gray)

120V/10W(E12)

• Belt Cut-off S/W

- Lever open : Resistance value < 1Ω

- Lever push : Resistance value

16026881 September 2006

RPL 16026540

125V/10A

127/99°C ,25A
HI-limit

!

240V/5300W

WARNING

• Motor (Electronic & GAS)
Contacts

Function 1M 2M 3M 5M 6M

Start

Run

Centrifugal Switch (Motor)

Radiant Sensor (Gas)

Resistance across terminal indicates a closed switch

TH2 Hi-Limit (Gas)

Less than 1 ohm

6

= Contact closed

©2006 Maytag Services

Troubleshooting Procedures

!

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

Gas Valve

123

Sensor Bars & temperature sensor check

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

CN6

WARNING

CN3

MOTOR

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

Cycling Thermostat - Disconnect harness

and test Blue wire Pin 2 to Red wire Pin 6.
Approx 10 K Ω at 25 °C 77° F.

thes.

September 2006 16026881

©2006 Maytag Services RPL 16026540

7

Wiring Schematic

!

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

WARNING

16026881 September 2006
RPL 16026540

8

©2006 Maytag Services

Wiring Schematic

!

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

WARNING

September 2006 9 16026881

©2006 Maytag Services RPL 16026540