tech-sheet-16026776
Electric Dryer Technical Information

CDG4205A*

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.

! WARNING

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

September 2006 1 16026776

©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.

Will Not Run – Clothes too wet due to insufficient spin out by

Will not start or run: washer. – All wires are hooked up to their corresponding Will Not Shut Off

terminals. Short in Sensor Circuit. – Dryer is plugged in. Check Membrane Pad. – Blown fuse or circuit breaker. Check Electronic Control Board. – Door switch functional…door closed. Troubleshooting the electronic – Start/Pause switch functional. – Control Board operational. control circuit: – Drive motor functional. – Check for miswiring of the electrical connector at the – Blown thermal fuse. electronic control board. Motor runs/ tumbler will not turn: – Does not shut off, then the problem is in the – Belt off or broken/damaged. – Idler tension spring too weak or stretched. electronic control unit. Disconnect the sensor wire – Idler pulley jammed or stuck. from the sensor bar. If the dryer runs for about 20 minutes, then shuts down or the timer advances, Runs a few minutes and then stops: then the electronic control unit is good and the – Lint buildup around drive motor. problem lies in the sensor bar. – Low voltage present. – Check sensor for continuity. If found, replace sensor – Blower impeller blocked in blower bar or clean with alcohol. Some fabric softener sheets will coat the sensor bars. housing. Noisy and/Or Vibration – Drive motor – start switch contacts stuck closed. – Thumping Check for loose tumbler baffle, rear

Blows fuses or trips circuit breaker: tumbler roller(s) worn or misaligned, out-of-round – The amperage readings are at 240 volts. One line tumbler or high weld seam on tumbler. – Ticking Check for loose wire harness or object will be 24 amps and the other line will be 21 amps. caught in blower wheel area. – Scraping Check for front or rear bulkhead felt seal The neutral line will be at 3 am ps. If the above out of position or worn tum bler front bearings. – Roaring Check for blower wheel rubbing on blower amperages are present, then the house wiring, fuse housing or bad motor bearings. box or circuit breaker should be suspect. – Popping or squealing sound. Check for a sticky or – Shorted heating element to housing. frayed belt. – Incorrect wiring or a wire shorting to ground. Poor Gas Ignition – Drive motor winding shorting to ground. When the dryer is operated on a heat setting, the igniter Will Not Dry should be energized and burner will fire within 45 seconds at 120 VAC. The failure of a component in this Will not heat (motor runs): system will usually be indicated by one of the following – Hi-Limit trips easily or is open. symptoms: – Regulating thermostat trips easily or is open. – Membrane switch open. The igniter does not glow. If the igniter does – Drive motor centrifugal start switch not allowing not heat up, remove power and check the following with an ohmm eter: voltage to gas valve or heating element. – Open flam e sensor Improper drying/clothes wrinkled/ rough – Open igniter – Shorted booster coil texture/long dry time: – Open wiring – Lint filter is not clean. Igniter glows – No gas ignition. If the igniter – Restriction in exhaust. – Outside exhaust hood damper door stuck closed. heats up but the main burner flame is not – Exhaust too long, too many elbows, flex ductwork ignited, remove power and using an ohmmeter, check the following: installed. – Open secondary coil – Poor makeup air available for the dryer. – Open holding coil – 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.

Gas Valve coil opens ? weak point in coil opens when stressed under heated conditions.

16026776 2 September 2006

©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.

– Open wire harness Diagnostic Tests – The gas is ignited but the flame goes out. If a The following table lists the various tests available while in the Service Mode. normal ignition takes place and after a short while the flame goes out, check for the Key Press Special following: Test/Function – Radiant sensor contacts opening * Hidden key (See Control Display diagnostic prematurely. codes. – Weak gas valve coil may open when Diagnostics). stressed by higher temperatures. Sequence thru the Dry Temp (^) diagnostic codes. Display shows 18 or other unexpected display:- Dryness Level (^) View tumbler If a consumer inadvertently presses the hidden temperature in Celsius switch when a cycle is not running, there will be an audible beep and the display will change to 18. The Diagnostic Codes Start Pause LED will flash. The Diagnostic Codes are identified when an abnormality is detected and service may be required. If a consumer inadvertently presses the hidden switch when a cycle is running, there will be an Accessing Diagnostic Codes audible beep and the display will change to 18. The Press Air Fluff and Time (+) to enter Service Mode. machine will run an 18 minute cycle. Press the * Hidden key to access the Diagnostic Codes. Scroll through the Diagnostic Codes by pressing Service Mode the Temperature (^). The first time the key is pressed This mode provides Service Personnel the ability to the newest code will be displayed. Each additional key verify the operation of the dryer. press shows the next code. Once all the codes have been displayed a ” d” is displayed and the process The Service Mode can be accessed at any time. While repeats. If there are no Diagnostic Codes available, “00” in the Service Mode, the Technician can start special will be displayed for the Diagnostic Code. diagnostic tests such as a System Check Mode, and Diagnostic code listings.

To Enter Service Mode: Press Air Fluff and Time (+) keys for 3 seconds, or until a beep is heard. The machine will now be in Service Mode and “d” will be displayed.

Exit Service Mode Press the OFF key to exit Service Mode.

* Control Diagnostics (Hidden Key)

Illustrated below is a hidden Service Mode key used to access the diagnostic codes only. The key will be referred to as “hidden key”, and is located under the surface of the last character (y) in the brand name.

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©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.

Clearing Diagnostic Codes System Check M ode To clear the diagnostic code list press Air Fluff and While in Service Mode, pressing the Air Fluff and Hidden key for 3 seconds while in diagnostic mode. Signal (+) keys for 3 seconds, will put the dryer into the System Check mode and “SC” will display. The Diagnostic Codes following table lists the various functions based on the keys being pressed. Code Description Trigger Action Taken

1 Dryer Thermistor The Check for: System Check Mode Table thermistor – Clogged lint Short Sensed resistance is screen. very low, – Restricted with a vent system. Key Pressed: Function te mperat ure Sensor Dry Performed Failed thermistor. > 175 ºF. Start/Pause Enable sensor Dry Temp (^) dry circuit (sense 2 Thermistor Open The Check for: Dryness Level (^) dry LED) when short circuit is Sensed thermistor – Low ambient detected across the sensor bars resistance is temperature in the normal dry LED will turn on. very high room (Below Cycles the motor relay on/off. 50 ºF/10 ºC). When the motor is running the – Outside vent start/pause LED is on. damper is stuck If motor is running, cycles open in the heater/gas valve on/off. wintertime. When the heater is regular temp Loose or open wire LED is on. View tumbler terminals temperature in Celsius. 3 Door Circuit Invalid state Check for:

Failure for more – Loose or open wire

than 256 terminals in Door

m ill isecon ds Sense circuit.

4 Possible motor If either Check for:

transistor error m oto r – Loose

transistor is connections in

seen open or motor circuit.

shorted – Run System

during Check Mode

star tup and check the

motor relay

function.

– If relay

functions,

disregard the

diagnostic

code.

If relay does not

function, replace

machine control

board.

5 Not Used

6 Non Volatile P roblem Disregard

Mem ory Detected

with integrity

of

parameters

stored in

E EPROM

m em or y.

8 Stuck Key A key is Run membrane pad

sensed to be check and replace

pressed console w/membrane

more than pad if necessary.

75 seconds,

the key shall

be assumed

to be stuck.

16026776 4 September 2006

©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.

Membrane Pad Continuity Checks

Note: Unplug connector and touch probe of meter to the appropriate pin numbers. Meter will show infinity on open keys and continuity on closed keys.

Membrane Pin Number Pin Number

Pad J7(12) J7(13) Motor Schematic Sensor dry J7(11) J7(13) Time dry J7(10) J7(13) Time(+) J7(9) J7(13) Time(-) J7(11) J7(14) Dry Temp(^) J7(10) J7(14) Dry Temp (v) J7(12) J7(14) Dryness Level (^) J7(19) J7(14) Dryness Level (v) J7(11) J7(15) * Hidden Key J7(9) J7(15) Winkle Prevent J7(10) J7(15) Air Fluff J7(11) J7(16) Start/Pause J7(12) J7(15) Signal(-) J7(9) J7(16) Off J7(12) J7(16) Signal(+)

sc pt on Connect onnec age C ent Pi Pi Nu Heater Relay Internal P1 BB1(1) 120VAC Output LI Board (input) BB1(1) BB2(3) 1 20V AC Door must be closed. Motor BB1(2) BB2(3) 120V AC Door must be closed (input) Neutral (input) BB2(2) BB1(1) 1 20VAC Door must be open Door Sense BB2(3) BB1(1) 1 20VAC NTC Thermistor J4(1) J4(2) 5VDC 70 ºF = 10K ohms 150 ºF = 1754 ohms J4(4) 24VDC Sensor Bar J4(3)

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©2006 Maytag Services

Wiring Diagram and Schematic

! WARNING

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

16026776 6 September 2006

©2006 Maytag Services