Maytag MDE/MDG21PDA Service Manual
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Maytag MDE/MDG21PDA Service Manual

Maytag MDE/MDG21PDA Service Manual

Commercial single and stack dryers
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This manual is to be used by qualified appliance
technicians only. Maytag does not assume any
responsibility for property damage or personal
injury for improper service procedures done by
an unqualified person.
Commercial
Single and
Stack Dryers
This Base Manual covers general information
Refer to individual Technical Sheet
for information on specific models
This manual includes, but is
not limited to the following:
MDE/MDG21PDA
MDE/MDG21PDD
MDE/MDG21PNA
MDE/MDG21PND
MDE/MDG21PRA
MLE/MLG23PDA
MLE/MLG23PDC
MLE/MLG23PRA
MLE/MLG23PDF
MLE/MLG23PRF
MLE/MLG23MNA
MLE/MLG23MNF
16022904
Revision 0
January 2004

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Summary of Contents for Maytag MDE/MDG21PDA

  • Page 1 This manual is to be used by qualified appliance technicians only. Maytag does not assume any responsibility for property damage or personal injury for improper service procedures done by an unqualified person. Commercial This Base Manual covers general information Refer to individual Technical Sheet...

  • Page 2: Important Information

    Important Notices for Servicers and Consumers Maytag will not be responsible for personal injury or property damage from improper service procedures. Pride and workmanship go into every product to provide our customers with quality products. It is possible, however, that during its lifetime a product may require service.

  • Page 3: Table Of Contents

    Dryer Diagnostic Mode .......... 66 Front Seal .............. 42 Dryer Help Mode ............ 66 Belt ................42 Baffles ............... 43 Rear Shroud Assembly ..........43 Back Seal .............. 44 Roller & Bearing Assembly ........44 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 4: Important Safety Information

    These flammable substances may cause the fabric to catch on fire by itself. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 5 This Service Manual describes the operation, C22.1, and such local regulations as might apply. It is ® troubleshooting, disassembly, and repair of Maytag the customer’s responsibility to have the wiring and dryer. It is intended for use by authorized technicians fuses checked by a qualified electrician to make sure who troubleshoot and repair these units.
  • Page 6 This unit should be plugged into a separate 60 hertz circuit with the electrical rating as shown in the appropriate drawing. Models operate with a supply voltage of 120 Volts. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 7: General Information

    To locate an record for future reference. authorized distributor: • For Maytag product call your distributor or visit the • For Maytag product call your distributor or visit the Web Site at www.maytagcommerciallaundry.com Web Site at www.maytagcommerciallaundry.com.

  • Page 8: Terminology/Definitions

    Cylinder which contains and tumbles clothes. Voltage - Electric pressure that forces the current to flow in a circuit. Wattage Wattage is a unit of measurement of the capability of electricity to do work. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 9: How It Works

    The second of the two valves is operated by a one-coil The gas controls utilize a hot surface ignition system. The three major components of the gas ignition system solenoid. This is called a Secondary Coil. are: Igniter, Radiant Sensor and Gas Valve. 1602904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 10 While the parallel booster coil and igniter are still in the circuit, they become ineffective due to their low resistance and the resulting reduced voltage available to them. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 11 Conversion kits are available to convert from natural to L.P. and back to natural. Check parts catalog for correct part number. 1602904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 12: Test Equipment

    TEST EQUIPMENT DESCRIPTION PART NUMBER The equipment required to service Maytag products depends largely upon the condition you encounter. Analog Test Meter 20000005 Locating a malfunction will often require the use of...

  • Page 13: Troubleshooting Procedures

    Should not exceed 0.92" or less than 0 water column inches Wattage Specifications DESCRIPTION WATTS Gas Dryer 350 Maximum without igniter Electric 5900 (240V)/5600 208V) Heating Element 5600 (240V)/5100 (208V) Igniter (NOTE: Ohm room temperature 180-400) Exhaust Ducts 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 14: Electrical Troubleshooting

    Examples include lid switches, timer contacts Using an ohm meter, you can also check the wiring selector switch and relay contacts. harness for continuity from the timer to the motor. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 15: Motor Test Cord

    Two test leads are required to check operation of the drive BTU Per 1050 2050 motor. To check the motor for operation, hook the test Cu. Ft cord to terminals 4 and 5. Pressure Switch Specific 0.65 1.53 Gravity Orifice Size 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 16: Manometer

    (this can be cuased by the wrong orfice, improper air mixture The water column (W.C.) for a Maytag dryer is 3.5" W.C. or high gas pressure. If pressure is as high as for Natural gas and 11" W.C. for LP.

  • Page 17: Mechanical Troubleshooting

    • Drive motor winding shorting to ground. • Scraping. Check for front or rear bulkhead felt seal out of position or worn tumbler front Rulon™ bearings. • Popping or squealing sound. Check for a sticky or frayed belt. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 18: Single Dryer Troubleshooting Guide

    Unplug the machine Abnormal then plug it back in. If If problem still exists, problem still exist, Display replace the control board. initiate the manual reset Function sequence. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 19 Runs Unplug the dryer is Plug the dryer in . If problem still exists, Without there continuity from perform the single dryer diagnostics GG2 to GG3? program. Program Selection Replace the control board. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 20 30 minutes is not desired, mode selected? pass with no cycle in process or deselect it in service Credited Are coin related activity. mode. Eventually Lost Go to the section "Abnormal Display Or Function" 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 21 Does door switch Adjust door switch open and close or replace it if properly? necessary. Unplug dryers and check If problem wiring and termination persists, replace between door switch and control board. control board. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 22 Check wiring and termination between Does the drum control board, motor Normal operation turn? relay, door switch, motor and thermal fuse. Does 115 VAC appear Replace the motor across the motor? Replace the control board. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 23 Make sure that there is not sensor, if too much ambient light. If If the problem still necessary problem still exists, replace exists, replace the the coin1 (or coin 2) optic control board. sensor. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 24 No Decimal denominations. Is Add coins mode Point Is Used selected? In The Price Display Go to the section "Abnormal Display Or Function" Dryer Check for exhaust Dries Too restriction Slowly 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 25 (Electric dryer only) Check motor centrifugal switch and replace if necessary Inspect the heater relay and replace if necessary (Electric Dryer only) If problem persists, replace the control board 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 26: Single Dryer Diagnostic Program

    Heat" in the flame to ignite)? troubleshooting guide Dryer is operating normally To cancel the diagnostic Exit operator mode using program, push the delicates the service switch program keypad 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 27: Single Dryer Diagnostic Code

    Coin Drop circuit between the coin seconds for the coin drop coin replace the drop and the control to sensor. control Problem control board. recognize the board. blockage 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 28 Is card reader card reader up machine to reader or installed? PR Models Only and control reset card reader control board. board Install reader call distributor to reset control board. PDA will not reset board. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 29: Stack Dryer Troubleshooting Guide

    This board. is a safety check on the door switch. If problem persist, Replace door replace control board. switch. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 30 See diagnostic code wiring and termination corresponding troubleshooting guide between door switch and membrane switch. control board. Replace door switch if necessary If problem persists, initiate reset sequence. If problem persists, replace control board. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 31 A battery must be Check battery If problem installed in order connector and persists, replace to keep time of termination control board. day during power interruptions. Dryer Check for exhaust Dries Too restriction Slowly 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 32 13 and 14 of connector while Operator control board. cycling the service switch Mode Does service If problem persists, replace Replace service switch open and control board switch close properly? 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 33 Push a delicates keypad appear? troubleshooting for at least 1 second guide. If problem Does 25 VDC appear Replace motor persists, replace across coil of motor relay. control board. relay? 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 34: Stack Dryer Diagnostic Program

    If desired, push Refer to dryer the respective Refer to no heat drum will not turn delicates keypad section. section. to cancel the service cycle. Exit operator mode by locking the service door. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 35: Stack Dryer Diagnostic Code

    Or Coin Drop Circuit between the coin seconds for the coin drop coin replace the drop and the control to sensor. control Problem control board. recognize the board. blockage. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 36 PR Models Only and control reset card reader control board. board Install reader or use PDA to change mode out of Gen 2 debit mode 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 37: Disassembly Procedures

    7. Lift Meter Case off the Top Cover. !. Disconnect power supply to unit. 2. Remove the screws securing the Facia. 3. Remove Microprocessor Board. 4. Disconnect ribbon connector. 5. Remove screws securing Touch Pad Assembly to Control Panel. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 38: Service Door Switch

    2. Unlock service access door. the machine. This will disengage the hinges from the 3. Loosen the two locking bolts from inside the meter slots in the front shroud. case. 4. Remove Control Panel. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 39: Reversing Door Assembly

    Note: Two are located vertically on either side of the door opening. These screws secure the front panel to the front shroud assembly. Remove Four Screws Remove Two Screws 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 40: Top Cover

    2. Remove the front panel . 1. Disconnect power supply to unit. 2. Remove Front Panel. 3. Remove wires from switch. 4. Squeeze tabs on switch together and remove switch. Hold Down Bracket 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 41: Front Shroud Assembly Removal

    Screws 3. Remove the two screws securing the shroud to the tumbler front and the two screws securing the shroud to the outlet duct. Pull the shroud free from the assembly. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 42: Lint Filter

    3. Remove old felt seal by prying the locking tabs up with a flat-blade screwdriver. Note: Pay close attention to the location of the seal overlap. This will be important as you reinstall the new seal. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 43: Baffles

    4. Insert left hand along side of tumbler at 8 o'clock. Note: Be careful on gas models, the igniter is fragile. Insert right arm under tumbler (as close to blower as possible). 5. Remove heat enclosure. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 44: Back Seal

    Felt Tumbler Rides on Light-Colored Side of Felt. Rear Bulkhead Dark-Colored Side of Felt is Clamped to the Channel of the Rear Bulkhead by Tabs. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 45: Thermostats

    Thermal Fuse mounted on the Heater Enclosure. 1. Disconnect power supply to unit. 2. Remove Front Shroud Assembly. 3. Remove screws holding cover to blower housing. Note: One screw secures blower Cover to base frame. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 46: Blower

    Little torque is required when Note: Models prior series 23, follow steps 3-5. Models reinstalling. beginning with series 23 skip to Step 6-7 3. Remove Retaining clip. 4. Compress and remove Clamp around hub of blower wheel. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 47: Exhaust Duct Pipe

    Remove Screws 7. Carefully lift the front half of the blower assembly and slide forward to disengage the motor base rear tab from the slot in the base frame. Idler Arm Assembly 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 48: Gas Valve Assembly

    Sensor 4. Remove screw holding Igniter to Burner. Igniter Gas Valve Secondary Coil Coils 1. Disconnect power supply to unit. 2. Remove Front Panel. 3. Unplug wires harness from the Gas Valve Coils. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 49: Gas Valve

    The barb must be bent parallel with each terminal before element package can be removed from the enclosure. Three screws hold the element package to the enclosure. Combustion Cone Hi-Limit Thermostat 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 50: Stack Dryer-Sloped Front

    4. Pull the service panel down. Control Panel 1. Disconnect power to the machine. 2. Remove the Access Panel. 3. Remove three security and two pozi drive screws securing the Control Panel under the Console. Service Wires Switch 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 51: Microprocessor

    2. Remove four security screws securing the Facia. Coin Drop 1. Disconnect power to the machine. 2. Remove the Service Panel. Microprocessor 3. Remove three security torx screws and two pozi-drive screws securing the Control Panel. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 52: Front Panel

    5. Remove two 5/16” screws holding coin drop mounting plate. Remove Screws 4. Remove the two 5/16" hex head screws located in the top right and left front corners of the Front Panel. Remove Screws 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 53: Stack Dryer Sloped Front (Pr Model)

    STACK DRYER-MN Models Note: The following section is exclusive to the MN stack dryers. Front Panel 1. Disconnect power supply to unit. 2. Remove two front screws. 3. Swing panel out and away from dryer. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 54: Timer

    4. Disconnect wire connection. Selector Switch 1. Disconnect power supply to unit. 2. Remove Timer Knobs (for both dryers) 3. Remove four screws securing Facia to Front Panel. 4. Remove Selector Switch Knob. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 55: Stack Dryer-Flat Front Models

    4. Remove four outer screws. 3. Remove three screws securing the microprocessor to the Front Panel. 4. Remove screws(T25 H) securing Front Panel. 5. Disconnect wiring connections. 6. Remove Microprocessor Board and bracket. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 56: Motor & Heater Relays

    1. Disconnect power supply to unit. 2. Remove Cabinet Brace. Note: Heater Relays are used ONLY on “MDE” model dryers (Electric Models). 3. Remove screws securing relay bracket. 4. Disconnect wires to relays. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 57: Appendix A

    Appendix A 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 58: Programming

    The dryer is now in the set-up through the intiation of a cycle. mode. There are four (4) types of pricing. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 59 NOT come with a debit-card reader. Connection to the control board is by means of a Molex brand connector (housing and terminals.) See your distributor for appropriate connector part numbers. 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 60: Set-Up Codes

    Selected or "ON." Press Delicates keypad three consecutive times to select "ON." Once this option is selected, you cannot go back to "00." Press Permanent Press keypad once to advance to next code. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 61 This selection, "HOUR," is the of time of day clock in hours; using military time (24 hour clock). Select from 00 to 23 by pressing the Whites & Colors keypad. Press Permanent Press keypad once to advance to the next code. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 62 Press Whites & Colors keypad to advance from 1 to 199 in nickels. PS models ONLY: Represents the total vend price in nickels. Example: b30 is equal to $1.50 Press Permanent Press keypad once to advance to next code. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 63 Enhanced debit is self-selected when a Genration 2 card reader is installed in the dyrer. The Ed option cannot be manually slected or deselected. Not avaiable on stacked dryer units. Press Permanent Press keypad once to advance to next code. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 64 End of set-up procedures. Exit from set-up mode. PD/PS Models Reinstall access door. PN Models Turn service key to "Run". PR Models Remove power, open console, re-insert plug in AA1, close console and apply power. 16022904 Rev. 0 ©2004 Maytag Appliances Company...
  • Page 65 When money counter option is selected, the numbers will "flash" in sequence. Example: Represents number of cycles in HUNDREDS 301 = $100.00 Represents number of cycles in ONES 468 = 68.00 Number of CENTS 575 = Total = $168.75 16022904 Rev. 0 ©2004 Maytag Appliances Company...

  • Page 66: Dryer Diagnostic Mode

    The Help Mode is entered by pressing the Whites & Colors keypad while in special pricing option, step 2.XX (or while dAS displays if operating with Maytag Data Acquisition set up). In help mode, the software revision is displayed in the digits.

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