Maytag CDE4205A Technical Information

Page 1

Electric Dryer⎯Technical Information

CDE4205A*

• 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 16023110 for detailed installation, operating, testing, troubleshooting, and disassembly instructions.

CAUTION

All safety information must be followed as provided in Service Manual 16023110.

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

WARNING

September 2006 16026775

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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.

Start/Pause switch functional.

Control Board operational.

Drive motor functional.

Blown thermal fuse.

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.

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.

Drive motor centrifugal start switch not allowing

voltage to heating element.

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 makeup air available for the dr yer.

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 Shut Off

Shor t in Sensor Circuit. Check Membrane Pad. Check Electronic Control Board.

Troubleshooting the electronic control circuit:

Check for miswiring of the electrical connector at the

electronic control board.

16026775 September 2006

WARNING

Does not shut off, then the problem is in the

electronic control unit. Disconnect the sensor wire from the sensor bar. If the dryer runs for about 20 minutes, then shuts down or the timer advances, then the electronic control unit is good and the problem lies in the sensor bar.

Check sensor for continuity. If found, replace sensor

bar or clean with alcohol. Some fabric softener sheets will coat the sensor bars.

Noisy and/Or Vibration

- Thumping

tumbler roller(s) worn or misaligned, out-of-round tumbler or high weld seam on tumbler.

- Ticking

caught in blower wheel area.

- Scraping

out of position or worn tumbler front bearings.

- Roaring Check for blower wheel rubbing on blower

- Popping or squealing sound. Check for a sticky or

frayed belt.

Display shows 18 or other unexpected display

If a consumer inadvertently presses the hidden

switch when a cycle audible beep and the display will change to 18. The Start Pause LED will flash. If a consumer inadvertently presses the hidden switch when a cycle audible beep and the display will change to 18. The machine will run an 18 minute cycle.

Check for loose wire harness or object

housing or bad motor bearings.

Check for loose tumbler baffle, rear

Check for front or rear bulkhead felt seal

is not running

is running

, there will be an

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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.

Service Mode

This mode p rovides Service Pers onnel the ability to verify the operation of the dryer.

The Service Mode can be accessed at any time. While in the Ser vice diagnostic tests such as a System Check Mode and diagnostic code listings.

Enter Service Mode:

Press

Air Fluff and

a beep is heard. The m ach ine will now be in Service Mode and “d” will be displayed.

Exit Service Mode

Press the

Control Diagnostics * (Hid den K ey )

Illustrated below is a hidden Service M ode key used to access the diagnostic codes only. The key will be ref erre d to a s hidde n key , an d is lo cated und e r the surface of the last character (y) in the brand name.

Mode, the Technician can start special

Time (+)

OFF

key to exit Service Mode.

keys for 3 seconds, or until

Diagnostic Tests

The followin g t able lists the various tests ava ilable w hile

Service Mode.

in the

Key Press Special

* H idde n Ke y (S e e Control Diagnostics)

Dry Temp (^)

Dryness Level (^)

Diagnostic Codes

The Diagnostic Codes are identified when an abnormality is detected and service may be required.

Accessin g Diagno stic Codes

Press

Air Fluff

Press the Codes. Scroll through the Diagnostic Codes by pressing the the newest code will be displayed. Each additional key press shows the next code. Once all the codes have been displayed a “d” is displayed and the process repeats. If there are no Diagnostic Codes available, will be displayed for the Diagnostic Code.

* Hidden

Temperature (^).

Test/Function

Display diagnostic codes.

Sequence thru diagnostic codes. View tum bler temperature in Celsius

and

Time (+)

key to access the Diagnostic

T he firs t tim e the key is pr esse d

to e nter Ser vice M ode.

“00”

September 2006 16026775

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Troubleshooting Procedures

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

Clearing Diagnostic Codes

To clear the diagnos tic code list press

Hidden

key for 3 seconds while in diagnostic mode.

Diagnostic Codes

Code Description Trigger Action Taken

Dryer Thermistor Short Sensed

Thermistor Open Sensed

Door Circuit Failure

Possible motor

transistor error

Not Used

5 6

Non Volat ile Memory

Stuck Key A key is

The thermistor resistance is very low, with a temperature > 175 degrees. The thermistor resistance is ver y high

Inva lid state for more than 256 milliseconds If either motor transistor is seen open or shorted during startup

Problem Detected with integrity of param eters stor ed i n EEPROM memory.

sensed to be pressed more than 75 seconds, the key shall be assumed to be stuck.

16026775 September 2006

Air Fluff

Check for

Failed thermistor.

Check for:

Low ambient temperature in room (Below 50 F/10 C).

Outside vent damper is stuck open in wintertime.

Loose or open wire

terminals

Check for:

- Loose or open wire terminals in Door

Sense circuit.

Check for:

Loose connections in motor circuit.

Run Sys tem Check Mode and check the motor relay function.

If relay functions, disregard the diagnostic code.

If relay does not

function, replace

machine control

Disregard

Run m embrane pad

check and replace

console w/membrane

pad if necessary.

WARNING

and

: Clogged lint screen. Restricted vent system.

ºº

board .

System Check Mode

While in Service Mode, pressing the

Signal (+)

System Check mode and "

keys for 3 seconds, will put the dryer into the

Air Fluff

" will display. The following table lists the various functions based on the keys being pressed.

System Check Mode Table

Key Pressed: Function

Performed Sensor Dry

Enable sensor

dry circuit (sense

dry LED) when

shor t circui t is

detected across

the sensor bars

the normal dry

LED will turn on

Start/Pause

Cycles the motor

relay on/off.

When the motor

is running the

start/pause LED

is on.

Dry Temp (^)

If motor is

running, cycles

the heater

on/off.

When the heater

is regular temp

LED is on.

Dryness level (^)

View tumbler

temperature in

Celsius.

and

Page 5

Troubleshooting Procedures

WARNING

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

Membrane Pad Continuity Checks

Unplug connector and touch probe of meter to the

Note:

appropriate pin numbers. Meter will show infinity on open keys and continuity on closed keys.

Membrane

Pin Number Pin Number

Pad

Sensor dry J7(12) J7(13) Time dry J7(11) J7(13) Time(+) J7(10) J7(13) Time(-) J7(9) J7(13) Dry Temp(^) J7(11) J7(14) Dry Temp (v) J7(10) J7(14) Dryness level (^) J7(12) J7(14) Dryness level (v) J7(19) J7(14)

Hidden Key Wrinkle Prevent J7(9) J7(15) Air Fluff J7(10) J7(15) Start/Pause J7(11) J7(16) Signal(-) J7(12) J7(15) Off J7(9) J7(16) Signal(+) J7(12) J7(16)

J7(11) J7(15)

Motor Schematic

es pt on Connec

Heater Relay Internal Output LI Board (input) BB1(1) BB2(3) 120VAC Door must be closed. Motor (input) Neutral (input) BB2(2) BB1(1) 120VAC Door Sense BB2(3) BB1(1) 120VAC Door must be open Th er mist or J4(1) J 4( 2 ) 5V DC NTC

Sens or B ar J4(3) J4(4 ) 24VDC

September 2006 16026775

Pin P1 BB1(1) 120VAC

BB1(2) BB2(3) 120VAC Door must be c losed

Co Pin

ol age om en

70 F = 10K ohms 150 F = 1754 ohms

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Wiring Diagram and Schematic

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

WARNING

16026775 September 2006