Page 1 W10251146B SErvicE ManuaL Maytag Commercial High Efficiency Single Load Gas and Electric Dryers 50Hz Models * PN model converted to PR MODELS: MDE22PD, MDG22PD, MDE22PN, MDG22PN MDE25PD, MDG25PD, MDE25PN, MDG25PN TEcHnicaL EDucaTiOn...
Page 2 FOrWarD This Maytag Service Manual, ”High Efficiency Single Load Gas and Electric Dryers 50Hz Models” (Part No. W10251146B), provides the Commercial Laundry Service Professional with information on the installation, operation, and service of the High Efficiency model 22 & 25 dryers. For specific information on the model being serviced, refer to the “Installation Instructions,”...
Page 3: Table Of Contents
Model & serial number label and tech sheet location ............1-3 Warranty ........................... 1-4 General user information ....................1-5 End of set-up procedures ....................1-11 Maytag commercial laundry literature list High Efficiency product ........1-12 inSTaLLaTiOn inFOrMaTiOn ....................2-1 Tools and parts ......................... 2-1 Location requirements ...................... 2-2 Venting requirements ......................
Page 4 Page Remove drum light lens ....................4-16 Remove service panel ...................... 4-16 Remove front panel ......................4-17 Remove lint filter housing ....................4-18 Remove front bulkhead ..................... 4-18 Remove outlet grill ......................4-19 Remove drum support rollers and shafts ................4-20 Remove drum baffle ......................
Page 5 Page cOMPOnEnT TESTinG ......................5-1 Gas valve coils ........................5-1 Burner ignitor ........................5-2 Manometers ........................5-2 Flame sensor ........................5-4 High temp thermostat & High temp cutout (gas dryers) ............ 5-4 Heating element (electric dryers) ..................5-5 High temp cutout ....................... 5-6 (electric dryers) .........................
Page 6: View Entire Service Video
inTEracTivE SErvicE ManuaL inSTrucTiOnS Click the mouse on any topic in the table of contents to go directly to that section. Click the mouse on any link that says (See page ?-?) to go directly to the page referenced. Click the mouse on any button in the links section below to open the attached document. This symbol means a video clip is available.
Page 7: General
GEnEraL DrYEr SaFETY iMPOrTanT Electrostatic Discharge (ESD) Sensitive Electronics ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress.
Page 8: Model Number Designations
MODEL nuMBEr DESiGnaTiOnS MODEL nuMBEr DESiGnaTiOnS MODeL nuMBer BranD Maytag DriVe TYPe DG Automatic Dryer Gas DE Automatic Dryer Electric PrODuCT 22 Commercial HE Dryer Commercial HE Dryer PAYMENT TYPE PD Processor Coindrop PN Processor Non-coin MarKeTinG CODe First series...
Page 9: Model & Serial Number Label And Tech Sheet Location
MODEL & SEriaL nuMBEr LaBEL anD TEcH SHEET LOcaTiOn Location of Model & Serial Number Label Location of Tech Sheet, Parts List & Wiring Diagram Inside The Service Panel...
Page 10: Warranty
For the first five years from the date of purchase, when this commercial appliance is installed, maintained and operated according to the instructions attached to or furnished with the product, Maytag brand of Whirlpool Corporation (thereafter “Maytag”) will pay for factory specified parts or original equipment manufacturer parts to correct defects in materials or workmanship.
Page 11: General User Information
GEnEraL uSEr inFOrMaTiOn Blank display Pricing This condition indicates the dryer is After the door is opened following completion inoperative. Check RFI device and for correct of a cycle, the display indicates the cycle price voltage to UIC from the transformer. (unless set for free operation).
Page 12 Free Cycles This is established by setting the cycle price to zero. When this happens ‘SELECT CYCLE’ will be displayed rather than the cycle price. Any cycle started as a free cycle will automatically terminate when the door is Electrical Shock Hazard opened.
Page 13 The dryer is now in the set-up mode. DiSPLaY Before proceeding, it is worth noting that, After the dryer has been installed and plugged despite all the options available, an owner can in, the display can show ‘0 minutes.’ simply choose to uncrate a new commercial dryer, hook it up, plug it in, and have a dryer all Models that operates.
Page 14 SErvicE accESS cODE - Pn Models Pn Models with a key switch on the This code can be entered to access service console: Insert access key and turn mode without removing the console. It counter-clockwise. only functions on dryers set up for 0 vend price without any Special Pricing set-up, and the Coin/Debit Option must be set to iMPOrTanT: The console must not be...
Page 15 SET-uP cODES CODE EXPLANATION The PERM. PRESS button will advance REGULAR CYCLE PRICE from code to code. Represents the number of coins (coin 1); may adjust from 0–39 (See b.xx set-up for VALUE OF COIN 1). Advance from 0–39 The WHITE AND COLORS button will by pressing WHITES AND COLORS.
Page 16 CODE EXPLANATION CODE EXPLANATION SPECIAL PRICING OPTIONS VAULT VIEWING OPTION This option is either SELECTED ‘ON’ or NOT SELECTED ‘OFF’. This option is either SELECTED ‘ON’ or NOT SELECTED ‘OFF’. Not Selected ‘OFF’. Not Selected ‘OFF’. Selected ‘ON’. Press DELICATES key pad once for this selection. Selected ‘ON’.
Page 17: End Of Set-Up Procedures
If money counter (1.0C or 1.C0) is selected, CODE EXPLANATION COIN/DEBIT OPTION the following is true: Both coin & debit selected. (NOT AVAILABLE) 3 00 Currency in Hundreds 3 01 = 100.00 Coins selected, debit disabled. Press DELICATES key pad for this selection. 4 00 Currency in Ones 4 68 = 68.00 Debit Card selected, coin disabled.
Page 18: Maytag Commercial Laundry Literature List High Efficiency Product
MaYTaG cOMMErciaL LaunDrY LiTEraTurE LiST MaYTaG cOMMErciaL LaunDrY LiTEraTurE LiST HiGH EFFiciEncY PrODucT HiGH EFFiciEncY PrODucT PRODUCT TYPE MODEL Install Instruct Tech Sheet Service Parts List MDE22PDAYW0 W10135154 W10239200 W10135169 MDE22PDBZW0 W10277179 W10239202 W10273436 MDE22PRBZW0 W10277179 W10239202 W10273434 MDE22PNAGW0 W10239198...
Page 19: Installation Information
inSTaLLaTiOn inFOrMaTiOn For complete installation instructions Parts supplied: go to the Document Links Page . Remove parts bag from dryer drum. Check that all parts were included. TOOLS anD ParTS • Foot boot (4) Gather the required tools and parts before starting installation.
Page 20: Location Requirements
LOcaTiOn rEquirEMEnTS recessed area and closet installation WARNING instructions: Commercial dryers may be installed in a recessed area or closet. For recessed area and closet installations, minimum clearances can be found in the Installation Instructions on the Document Links Page . Explosion Hazard Keep flammable materials and vapors, The installation spacing is in inches and is...
Page 21: Venting Requirements
vEnTinG rEquirEMEnTS Flexible metal vent must be fully extended WARNING and supported when the dryer is in its final position. Remove excess flexible metal vent to avoid sagging and kinking that will result in reduced airflow and poor performance. An exhaust hood should cap the vent to avoid rodents and insects from entering the home or Fire Hazard business.
Page 22 direction of the airflow. Vents entering from the opposite side B. Good should be staggered to reduce the exhausted air from interfering with the other vents. Allow as much room as possible when using elbows or making turns. Bend vent gradually to avoid kinking. The maximum angle of each vent entering the main vent should be no more than 30°.
Page 23 if an exhaust hood cannot be used: The outside end of the main vent should have a sweep elbow directed downward. If the main vent travels vertically through the roof, rather than through the wall, install a 180° sweep elbow on the end of the vent at least 2 ft. (61 cm) above the highest part of the building.
Page 24: Gas Pipe Chart (Natural Gas)
GaS PiPE cHarT (naTuraL GaS) The chart shows the maximum capacity in EXAMPLE: terms of cubic feet of gas per hour, for various sizes of pipe at lengths of from 10 feet to 200 The dryer has a rating of 30,000 BTU. If the feet.
Page 25: Theory Of Operation
THEOrY OF OPEraTiOn STarTinG THE DrYEr WARNING WARNING Fire Hazard Explosion Hazard No washer can completely remove oil. Keep flammable materials and vapors, Do not dry anything that has ever had any such as gasoline, away from dryer. type of oil on it (including cooking oils). Do not dry anything that has ever had Do not dry items containing foam, rubber, anything flammable on it (even after washing).
Page 26: Air Intake And Exhaust
air inTakE anD ExHauST air inTakE anD ExHauST Room temperature air (white arrows) enters The moistened heated air is drawn down Room temperature air (white arrows) enters The moistened heated air is drawn down the lower portion of the dryer through a gap through the lint filter, through the blower and the lower portion of the dryer through a gap through the lint filter, through the blower and...
Page 27: Typical Cycle Of Operation
TYPicaL cYcLE OF OPEraTiOn When WHITES AND COLORS is selected, 1. Thermal Fuse the high heat cycle is activated. The high temp 2. Exhaust Thermistor cycle uses the circuit that involves the 68.3°C 3. High temp cutout (155°F) setting for the exhaust thermistor. 4.
Page 28 The broken belt switch is in series with the motor and has one of its leads connect directly to a terminal on the motor thermal overload. If either the broken belt switch or the motor thermal overload opens the circuit, it will stop the motor, which in turn will cause the motor centrifugal switch to open and change the position of the motor switches, opening motor...
Page 29: Understanding The Gas Valve And Ignition System
unDErSTanDinG THE GaS vaLvE anD iGniTiOn SYSTEM The sensor, ignitor and gas valve are A significant voltage drop develops across interrelated and function as the ignition and the secondary coil, which renders both the heat source for gas dryers. At the start of the booster coil and the ignitor ineffective due to cycle the radiant sensor contacts are closed, their high resistance and the reduced voltage...
Page 30: Cleaning The Dryer Location
iMPOrTanT: WARNING • Do not run the dryer with the lint screen loose, damaged, blocked, or missing. Doing so can cause overheating and damage to both the dryer and fabrics. • If lint falls off the screen into the dryer during removal, check the exhaust hood and remove the lint.
Page 31: Cleaning The Dryer Interior
cLEaninG THE DrYEr inTEriOr To clean dryer drum: Unplug dryer of disconnect power. Make a paste with powdered laundry detergent and very warm water. Close shutoff valve in gas supply line. Apply paste to a soft cloth, or, apply a liquid Clean lint screen (See page 3-6).
Page 32: Dryer Gas Specs
DrYEr GaS SPEcS 220-240V~50Hz 1ph 3A max. IP24 Clothes capacity: 9.0 kg max. Factory set for NATURAL GAS: Injector size: 2.2 mm Heat input gross: 5.9 kW European Country: CH, CZ, CY, ES, GB, GR, HR, AT, CH, CY, CZ, DK, EE, FI, GR, IE, IT, PT, SI, SK, TR HU, IT, NO, RO, SE, SK, TR II 2H3+...
Page 33: Component Access
COMPONENT ACCESS cOMPOnEnT accESS COMPONENT LOCATIONS FOUND BEHIND THE FRONT PANEL The components and their locations are shown below. Step-Down Transformer Rear Bulkhead 240 to 120VAC Central Control Unit Light Lens UIC Transformer Keypad Assembly Console User Interface Behind Display Lens Rear Drum Rollers Rear Drum Rollers Anti-Rattle Clip...
Page 34: Remove Facia And Display Lens - Model 22
rEMOvE Facia anD DiSPLaY LEnS - MODEL 22 TEcH TiP: If the facia does not lay flat against the front of the dryer, the gap can be corrected by applying double stick tape to the back of it, or by putting a reverse bow on the facia before reinstalling it on the dryer.
Page 35: Remove Control Panel Cover
rEMOvE cOnTrOL OPEn DrYEr TOP PanEL cOvEr Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all parts and panels before Replace all parts and panels before operating. operating. Failure to do so can result in death or Failure to do so can result in death or electrical shock.
Page 36: Remove Control Panel
rEMOvE cOnTrOL PanEL Disconnect wire harness Rast connector from the CCU to UIC. Disconnect key pad ribbon connector by gently pulling it out of the connector. Disconnect transformer wire connector at Electrical Shock Hazard AA6. Disconnect power before servicing. Replace all parts and panels before Disconnect service switch wire connector at operating.
Page 37: Remove Keypad Assembly
rEMOvE kEYPaD aSSEMBLY To remove buttons from subassembly, release locking tab on back side of subassembly. The other end simply slides out of a slot in the backer plate. Electrical Shock Hazard Locking Disconnect power before servicing. Replace all parts and panels before operating.
Page 38: Remove User Interface Control Board (Uic)
rEMOvE uSEr inTErFacE cOnTrOL BOarD (uic) TEcH TiP: Connector J1 on the control board is for programming software onto the board. The jumper pins at J2 must be jumped for reprogramming and left open when in normal use. Electrical Shock Hazard Disconnect power before servicing.
Page 39: Remove Ccu Mounting Bracket
rEMOvE ccu MOunTinG BrackET On Model 25 dryers, there is no step-down transformer. Remove the UIC transformer (See page 4-8). Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock.
Page 40: Remove Uic & Step-Down Transformers
rEMOvE uic & STEP-DOWn TranSFOrMErS nOTE: The screws for the transformer are shorter than other 1/4” hex head screws used in the dryer so the screw will not touch the drum below the bracket. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating.
Page 41: Remove Central Control Unit (Ccu)
rEMOvE cEnTraL cOnTrOL uniT (ccu) Disconnect K2 relay wire connector by pulling connector off the control. Remove the 1/4” hex head screw that secures CCU to the bracket. Electrical Shock Hazard Turn bracket over and press the locking tab Disconnect power before servicing. on the bottom of the bracket.
Page 42: Remove Control Panel Bracket
rEMOvE cOnTrOL PanEL BrackET Lift control panel bracket and turn it over setting it on the dryer drum. Use a pair of pliers to squeeze two Christmas tree clips to release wire ties from the bracket. Electrical Shock Hazard Christmas Disconnect power before servicing.
Page 43: Remove Dryer Top
rEMOvE DrYEr TOP Pull wires through the hole in the top. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. Open service access door on the top of the Remove two #2 star head screws from each metercase.
Page 44: Remove Dryer Door
rEMOvE DrYEr DOOr Remove the remaining three star head screws that secure the door hinge to the dryer front panel. After removing three and loosening one screw, grasp the door and pull the hook of the hinge out of the slot in front panel, then Electrical Shock Hazard lift door hinge off the remaining screw.
Page 45: Reverse Dryer Door
rEvErSE DrYEr DOOr Install hinge screw hole cover on opposite side of door opening. Align two pins on the back of cover with the two middle holes for the door hinge screw holes. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating.
Page 46 Remove four star head screws that secure Rotate outer door 180° to place handle on the hinge to the door. the opposite side of hinge location. Hinge Move hinge to other side and attach it with four screws just removed. There are two placement pins in the hinge that fit into two holes for correct hinge placement.
Page 47: Remove Door Handle
rEMOvE DOOr HanDLE rEMOvE innEr DOOr SuPPOrT To remove door handle after door halves Separate door halves (See page 4-13). are separated (See page 4-13). Remove 3 star head screws. Remove door handle (See left column on this page). Rotate inner lens slightly to release tabs that secure the inner lens to the front door half and lift lens out of door trim.
Page 48: Remove Drum Light Lens
rEMOvE DruM LiGHT LEnS rEMOvE SErvicE PanEL Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all parts and panels before Replace all parts and panels before operating. operating. Failure to do so can result in death or Failure to do so can result in death or electrical shock.
Page 49: Remove Front Panel
rEMOvE FrOnT PanEL Remove two 1/4” hex head screws that secure the top of the front panel to the dryer. Electrical Shock Hazard Two 1/4” Disconnect power before servicing. Hex Head Replace all parts and panels before Screws operating. Failure to do so can result in death or electrical shock.
Page 50: Remove Lint Filter Housing
rEMOvE LinT rEMOvE FrOnT FiLTEr HOuSinG BuLkHEaD Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all parts and panels before Replace all parts and panels before operating. operating. Failure to do so can result in death or Failure to do so can result in death or electrical shock.
Page 51: Remove Outlet Grill
rEMOvE OuTLET GriLL Lift outlet grill off front bulkhead. Separate the two halves of the outlet grill by pulling them apart. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock.
Page 52: Remove Drum Support Rollers And Shafts
rEMOvE DruM SuPPOrT rOLLErS anD SHaFTS nOTE: When replacing a roller, always replace both tri-clips to make sure that roller will stay in position while running. nOTE: DO NOT lubricate this wheel or shaft. Clean shaft with fine steel wool to eliminate squeaks, or replace worn roller Electrical Shock Hazard supports.
Page 53: Remove Drum Baffle
rEMOvE DruM BaFFLE Open dryer door and hold baffle with one hand while removing the third screw. Remove baffle from dryer and replace if necessary. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock.
Page 54: Remove Dryer Drum
rEMOvE DrYEr DruM The dryer drum is installed with the drum clip, plug or hole, closer to the bulkhead at the rear of the dryer. This is opposite the orientation of drum in dryer that matches the top load washer. The support rollers roll in this direction without a thump, as they roll from the higher side to the lower side of the welded seam of the drum...
Page 55: Remove Blower Wheel
rEMOvE BLOWEr WHEEL To remove blower wheel when a speed increaser belt is broken, slipping or missing, a thin 7/16” open end wrench will be needed to secure speed increaser shaft on its flat spot, in lieu of securing motor pulley. Speed Electrical Shock Hazard Increaser Shaft...
Page 56: Remove Thermistor
rEMOvE THErMiSTOr rEMOvE THErMaL FuSE Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all parts and panels before Replace all parts and panels before operating. operating. Failure to do so can result in death or Failure to do so can result in death or electrical shock.
Page 57: Remove Blower Housing
rEMOvE BLOWEr rEMOvE BrOkEn HOuSinG BELT SWiTcH Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all parts and panels before Replace all parts and panels before operating. operating. Failure to do so can result in death or Failure to do so can result in death or electrical shock.
Page 58: Remove Exhaust Duct
rEMOvE ExHauST DucT TEcH TiP: When reinstalling exhaust duct, or for new dryer installations, make sure the anti-vibration clip for the exhaust duct is installed on back panel of dryer. To install clip, slide long leg of clip into dryer along the exhaust duct.
Page 59: Remove Dryer Motor
rEMOvE DrYEr MOTOr Remove the Earthing clip from the motor frame. This will allow the motor to be rotated enough to remove red wire with a white stripe from the bottom of the motor switch. Earth Clip Electrical Shock Hazard Disconnect power before servicing.
Page 60: Remove Motor Bracket
rEMOvE MOTOr BrackET TEcH TiP: To reduce excess vibration transferred from the motor bracket to the cabinet, place anti-vibration pads, if they are missing, under the motor bracket. Install two pads if possible, or if only one is available then center it below the bracket. Electrical Shock Hazard Two Anti-Vibration Disconnect power before servicing.
Page 61: Remove Idler Assembly Parts
rEMOvE iDLEr aSSEMBLY ParTS Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. Remove dryer drum (See page 4-22). nOTE: After implementation of this style Gently pry tri-clip off idler pulley shaft.
Page 62: Remove Drum Rear Support Rollers
rEMOvE DruM rEar rEMOvE rEar SuPPOrT SuPPOrT rOLLErS rOLLEr SHaFTS Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all parts and panels before Replace all parts and panels before operating. operating. Failure to do so can result in death or Failure to do so can result in death or electrical shock.
Page 63: Remove Rear Panel
rEMOvE rEar PanEL Remove ten 1/4” hex head screws that secure the rear panel to the dryer. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock.
Page 64: Remove Dryer Side Panel (Left Side Shown)
rEMOvE DrYEr SiDE PanEL (LEFT SiDE SHOWn) Support side panel and lift rear bulkhead and move it forward to release hook from the back edge of the side panel. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating.
Page 65: Remove Rear Bulkhead
rEMOvE rEar BuLkHEaD rEMOvE HEaT PLEnuM Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all parts and panels before Replace all parts and panels before operating. operating. Failure to do so can result in death or Failure to do so can result in death or electrical shock.
Page 66: Remove Metercase
rEMOvE METErcaSE Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Two 1/2” Hex Failure to do so can result in death or Head Bolts electrical shock. Lift metercase off the top of the dryer. Remove coin box.
Page 67: Remove Metercase Mounting Brackets
rEMOvE METErcaSE rEMOvE SErvicE accESS MOunTinG BrackETS SWiTcH - PD MODEL Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all parts and panels before Replace all parts and panels before operating. operating. Failure to do so can result in death or Failure to do so can result in death or electrical shock.
Page 68: Remove Coin Vault Switch - Pd Model
rEMOvE cOin vauLT SWiTcH - PD MODEL Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. Remove coin box. Remove service access door from top of metercase.
Page 69: Remove Coin Drop - Pd Model
rEMOvE cOin DrOP - PD MODEL nOTE: When reinstalling the coin drop make sure that wires connected to the coin sensor go straight back from the coin sensor. If wire goes forward it could break the beam of the coin sensor and show an error on the UIC.
Page 70: Remove Flame Sensor
rEMOvE FLaME SEnSOr rEMOvE HiGH TEMP THErMOSTaT Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all parts and panels before Replace all parts and panels before operating. operating. Failure to do so can result in death or Failure to do so can result in death or electrical shock.
Page 71: Remove High Temp Cutout
rEMOvE HiGH rEMOvE iGniTOr TEMP cuTOuT Electrical Shock Hazard Electrical Shock Hazard Disconnect power before servicing. Disconnect power before servicing. Replace all parts and panels before Replace all parts and panels before operating. operating. Failure to do so can result in death or Failure to do so can result in death or electrical shock.
Page 72: Remove Auto Transformer - Gas Dryers
rEMOvE auTO TranSFOrMEr - GaS DrYErS Wire connections on the auto transformer: “L1LD” terminal is the blue wire “LD” terminal is the black wire See page 5-14 for the beige wire. These three wires are disconnected together from the three wire connector, in Electrical Shock Hazard the dryer, with Red, Black and Blue wires.
Page 73: Remove Gas Valve Coils
rEMOvE GaS vaLvE cOiLS Lift bracket off coils. nOTE: When reinstalling or replacing coils make sure that the positioning pins on the coils are fitted into the matching holes in the coil bracket before tightening the bracket in place. Also make sure that replacement Electrical Shock Hazard coils are rated for 50Hz.
Page 74: Remove Gas Valve Assembly
rEMOvE GaS vaLvE aSSEMBLY Remove two 1/4” hex head screws that secure the brace to base of the dryer and twist to remove the brace from under the gas valve. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating.
Page 75: Remove Gas Valve From Bracket
rEMOvE GaS vaLvE FrOM BrackET Remove three 1/4” hex head screws from bottom of bracket. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. Three 1/4”...
Page 76: Remove Electric Heating Element
rEMOvE ELEcTric HEaTinG ELEMEnT Lift bracket and heater assembly to remove the bottom edge of the assembly and press down to release the tab from inside the heat plenum at the back of the dryer. Locking Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating.
Page 77: Remove Heater Coil
rEMOvE HEaTEr cOiL Use a pair of pliers to hold the housing and another pair of pliers to pull heater coil up out of the housing. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock.
Page 78: Remove 180° Opening Door And Hinge
rEMOvE 180° OPEninG DOOr anD HinGE The door on the Model 25 dryer swings After removing three and loosening one completely open (180°). screw, grasp the door and pull the hook of the hinge out of the slot in front panel, then lift door hinge off the remaining screw.
Page 79: Remove Control Panel Cover And Snap-In Display Lens
rEMOvE cOnTrOL PanEL cOvEr anD SnaP-in DiSPLaY LEnS Remove four T-20 security machine screws from the name plate. Support the name plate when removing the final screw. Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating.
Page 80 ---- nOTES ---- 4-48...
Page 81: Component Testing
cOMPOnEnT TESTinG Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. GaS vaLvE cOiLS The gas valve is actually a regulator and 2 valves in 1. Each valve is in series with the other.
Page 82: Burner Ignitor
The pressure is then read on the manometer as the water column pushes downward. The water column (W.C.) for a Maytag dryer is 3.5” W.C. for Natural gas and 11” W.C. for LP gas.
Page 83 Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. How to use a manometer: Turn on the gas and reconnect dryer to Disconnect power supply to dryer. power.
Page 84: Flame Sensor
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. FLaME SEnSOr HiGH TEMP THErMOSTaT & HiGH TEMP cuTOuT (GaS DrYErS) Unplug dryer or disconnect power. The High Temp Thermostat cycles open at temperatures above 121°C (250°F).
Page 85: Heating Element (Electric Dryers)
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. HEaTinG ELEMEnT (ELEcTric DrYErS) Unplug dryer or disconnect power. Remove the electric heating element. (See page 4-44). Disconnect the wire connectors from the heater terminal block Set the ohmmeter to the R X 1 scale.
Page 86: High Temp Cutout
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. HiGH TEMP cuTOuT (ELEcTric DrYErS) Access the Electric Heating Element High Temp (See page 4-44). Cutout The high temp cutout is a non resettable High Temp...
Page 87: Centrifugal Switch
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. cEnTriFuGaL SWiTcH Unplug dryer or disconnect power. Test the other contacts of the centrifugal switch following the chart below. Turn off gas supply to dryer.
Page 88: Drive Motor
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. DrivE MOTOr Unplug dryer or disconnect power. Run Winding - White to Blue Turn off gas supply to dryer. Remove the three wires from the motor connected to the centrifugal switch.
Page 89: Thermistor
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. THErMiSTOr Check the thermistor resistance value The table below gives the resistance values at any or all of the temperature levels in that should be observed for the various question, using the Dry Cycle, and the temperature settings.
Page 90: Thermal Fuse
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. THErMaL FuSE Unplug dryer or disconnect power. The thermal fuse is wired in series with the drive motor.
Page 91: User Interface Membrane Switch
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. uSEr inTErFacE MEMBranE SWiTcH Unplug dryer or disconnect power. 3 button user interface membrane switch Contact Contact Button...
Page 92: Uic Transformer
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. uic TranSFOrMEr Unplug dryer or disconnect power. Yellow to Red = .8Ω Red to Red = 1.2Ω...
Page 93: Step-Down Transformer - Model 22 Dryers
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. STEP-DOWn TranSFOrMEr - MODEL 22 DrYErS Model 22 dryers will have a 220VAC to Set ohmmeter to the R X 1 scale. Set digital ohmmeters to lowest scale.
Page 94: Auto Transformer - Gas Dryers
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. auTO TranSFOrMEr - GaS DrYErS The autotransformer is used in a gas dryer to step down the incoming voltage source to 120VAC used by the gas valve circuit and the control board.
Page 95: Coin Drop Acceptor
Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. cOin DrOP accEPTOr The coin drop acceptor is used only in the The coin sensor is mounted to a bar located PD model dryers.
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Page 97: Diagnosis & Troubleshooting
DiaGnOSiS & TrOuBLESHOOTinG DiaGnOSTic cODES PrOPEr EarTHinG OF 240 vOLT WaLL OuTLETS All dryers that plug into a wall outlet have If the set-up mode is entered and one of a power cord supplied for the proper the following has previously occurred, the configuration.
Page 98: Troubleshooting Guide
TrOuBLESHOOTinG GuiDE Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. nOTE: Possible Cause/Tests MUST be performed in the sequence shown for each problem. 1.
Page 99: Troubleshooting Tests
TrOuBLESHOOTinG TESTS In a similar way, check which terminal of the plug is connected to the right-most contact on the terminal block and make a note of it. This will be L1 (black wire) in the wiring diagram. Electrical Shock Hazard Disconnect power before servicing.
Page 100 On model 22: Check for continuity (0 Ω) Reinstall the console electronics, console between the neutral (N) terminal of the assembly, and all parts and panels before plug and white wire on the step down operating. transformer. Plug in dryer or reconnect power. On model 25: Check for continuity (0 Ω) between the neutral (N) terminal of the plug Perform the Diagnostic Test to verify repair.
Page 101 With an ohmmeter, check for continuity Plug in dryer or reconnect power. (0 Ω) between the neutral (N) terminal of the plug and white wire (N) of the harness Perform the Diagnostic Test to verify repair. connector. The left-hand side of the illustration below shows the position of the If indicators do not light, the dryer UIC neutral terminal (N) on the power cord plug.
Page 102 Check the belt switch. Remove the drum Remove wires directly from Motor Switch. belt from the spring loaded idler pulley. Start Listen for switch to click as the idler arm is moved up and down. Winding Main Winding Check for the resistance values of the motor’s Main and Start winding coils as shown in chart.
Page 103 Dryer does not heat: • Connect an ohmmeter to neutral, and the white connector on terminal P4 of the CCU. ELEcTric DrYEr: • With the door properly closed, the ohmmeter should Indicate continuity (0–2Ω). Unplug dryer or disconnect power. • If not, isolate the two door switches, test Remove the service panel to access the individually as explained in step 3.
Page 104 GaS DrYEr: If heater coil and thermostat circuit check OK, check centrifugal switch 1M to 2M. Unplug dryer or disconnect power. • Manually close motor switch while Locate the red wire at the gas valve and the Checking for closed circuit (0Ω) between 1M and 2M.
Page 105 TEST #3a: Thermal Fuse Test TEST #3c: Gas valve Test Unplug dryer or disconnect power. Unplug dryer or disconnect power. Access the thermal fuse to the left of the Access the gas valve. thermistor on top of the blower housing. Use an ohmmeter to determine if a gas Disconnect one wire from thermal fuse.
Page 106 TEST #4: Door Switch Test TEST #5 Exhaust Temperature Test: Activate Diagnostic Test Mode, and perform Hold a thermometer capable of reading from a Door Switch Test. Functionality can be 32° to 82°C (90° to 180°F) in the center of the exhaust outlet.
Page 107: Troubleshooting Dryer Operation
TrOuBLESHOOTinG DrYEr OPEraTiOn Dryer displaying F or D codes Dryer will not run • Is there anything in the display lit? • If F or D code is displayed, check the Document Links Page for the proper tech If not, check incoming voltage and UIC sheet and proper diagnostic procedures.
Page 108 unusual sounds Dryer display flashes in user mode • Has the dryer had a period of non-use? • Make sure coin box is inserted all the way and locked in place. If the dryer hasn’t been used for a while, there may be a thumping sound during the •...
Page 109: Troubleshooting Dryer Results
TrOuBLESHOOTinG DrYEr rESuLTS clothes are not drying satisfactorily, drying times too long, or load is too hot • is the lint screen clogged with lint? • is the exhaust vent diameter the correct size? Lint screen should be cleaned before each load.
Page 110 Lint on load Loads are wrinkled • is the lint screen clogged? • Was the load removed from dryer at the end of the cycle? Clean lint screen. Check for air movement. Allowing clothes to set too long in the dryer Check for proper detergent use in washer.
Page 111: Diagnostic Mode
WHITES & COLORS button while in set-up code 6 (or while dAS displays if operating option 2.XX (or while dAS displays if operating with Maytag Data Acquisition setup) or with with Maytag Data Acquisition setup). In help a diagnostic code present. Diagnostic codes...
Page 112: Central Control Unit (Ccu) Connections
cEnTraL cOnTrOL uniT uSEr inTErFacE (ccu) cOnnEcTiOnS cOnTrOL (uic) cOnnEcTiOnS connector N / P X - X E D A C N I C e t e d o D D Y x x - D 6-16...
Page 113: Wiring Diagrams
WirinG DiaGraMS WIRING DIAGRAM – PD ELECTRIC MODELS WIRING DIAGRAM – PD ELECTRIC MODELS MODEL 22 PD ELEcTric MODELS CENTRAL CONTROL UNIT (CCU) CENTRAL CONTROL UNIT (CCU) FUSE FUSE WIRING DIAGRAM – PD GAS MODELS MODEL 22 PD GaS MODELS WIRING DIAGRAM –...
Page 114: Model 22 Pn Electric Models
WIRING DIAGRAM – PN ELECTRIC MODELS MODEL 22 Pn ELEcTric MODELS WIRING DIAGRAM – PN ELECTRIC MODELS CENTRAL CONTROL UNIT (CCU) CENTRAL CONTROL UNIT (CCU) FUSE FUSE WIRING DIAGRAM – PN GAS MODELS WIRING DIAGRAM – PN GAS MODELS MODEL 22 Pn GaS MODELS CENTRAL CONTROL UNIT (CCU) CENTRAL CONTROL UNIT (CCU)
Page 115: Model 25 Pd Gas Models
MODEL 25 PD ELEcTric MODELS MODEL 25 PD GaS MODELS WIRING DIAGRAM – PD GAS MODELS...
Page 116: Model 25 Pn Gas Models
MODEL 25 Pn ELEcTric MODELS MODEL 25 Pn GaS MODELS WIRING DIAGRAM – PN GAS MODELS...
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Maytag MDG25PN Service Manual

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