TECH SHEET - DO NOT DISCARD PAGE 1 FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10110638 WARNING 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. IMPORTANT Electrostatic Discharge (ESD) Sensitive Electronics ESD problems are present everywhere. ESD may damage or weaken the machine control electronics. 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. ■ Use an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted metal in the appliance -OR- Touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance. ■ Before removing the part from its package, touch the anti-static bag to a green ground connection point or unpainted metal in the appliance. ■ Avoid touching electronic parts or terminal contacts; handle machine control electronics by edges only. ■ When repackaging failed machine control electronics in anti-static bag, observe above instructions. DIAGNOSTIC GUIDE Before servicing, check the following: ■ Make sure there is power at the wall outlet. ■ Has a household fuse blown or circuit breaker tripped? Time delay fuse? ■ Is dryer vent properly installed and clear of lint or obstructions? ■ All tests/checks should be made with a VOM (volt-ohm-milliammeter) or DVM (digital-voltmeter) having a sensitivity of 20,000 Ω per volt DC or greater. ■ Check all connections before replacing components. Look for broken or loose wires, failed terminals, or wires not pressed into connectors far enough. ■ A potential cause of a control not functioning is corrosion on connections. Observe connections and check for continuity with an ohmmeter. ■ Connectors: Look at top of connector. Check for broken or loose wires. Check for wires not pressed into connector far enough to engage metal barbs. ■ Resistance checks must be made with dryer unplugged or power disconnected. DIAGNOSTIC TESTS These tests allow service personnel to test and verify all inputs to the machine control electronics. You may want to do a quick and overall checkup of the dryer with these tests before going to specific troubleshooting tests. ACTIVATING THE SERVICE DIAGNOSTIC TEST MODE 1. Be sure the dryer is in standby mode (plugged in with all indicators off, or with only the Done indicator on). 2. Select any one button (except Pause/Cancel) and follow the steps below, using the same button (remember the button): a. b. c. d. e. Press/hold 2 seconds Release for 2 seconds Press/hold 2 seconds Release for 2 seconds Press/hold 2 seconds 3. If this test mode has been entered successfully, all indicators on the console are illuminated for 5 seconds with 8 : 88 showing in the Estimated Time Remaining three-digit display. If there are no saved fault codes or active fault codes, all indicators on the console will momentarily turn off, then stay on with 8 : 88 displayed. Continue with Diagnostics. 4. If entry into diagnostic mode is unsuccessful, choose a different button (except Pause/Cancel) and repeat step 2. ➔ If no indicators come on after repeating step 2 using a different button, go to TEST #1, page 4. DIAGNOSTIC: Active Fault Codes If there is an active fault code, it will be flashing in the display. Review the Display Fault/Error Codes table, page 3, for the recommended procedure. If there is no active fault code, 8 : 88 will be displayed. DIAGNOSTIC: Saved Fault Codes If there are saved fault codes, the most recent fault code will show “F:” and flash “XX” where XX is the fault code. Press and release the same button used to activate Diagnostics ➔ beep tone ➔ Second most recent fault code is displayed. Repeat ➔ beep tone ➔ Third most recent fault code is displayed. Repeat ➔ beep tone ➔ Fourth most recent fault code is displayed. Repeat ➔ All indicators momentarily turn off, then stay on. DIAGNOSTIC: Console Buttons and Indicators Pressing buttons and rotating the cycle selector will turn off the corresponding indicator and sound a beep as shown in figure 1, page 2. Pressing (more time) will toggle the left digit and colon on the display while sounding a beep. Pressing (less time) will toggle the right two digits on the display while sounding a beep. ➔ If indicators fail to come on and beep after pressing buttons and rotating the cycle selector, go to TEST #7, page 9. DIAGNOSTIC: Door Switch Opening the door should cause a beep and an alphanumeric number to be displayed. Closing the door should cause a beep and 8 : 88 to be displayed. ➔ If opening the door fails to cause a beep and a number and letter to be displayed, go to TEST #8, page 9. DIAGNOSTIC: Moisture Sensor Open the door and locate two metal strips on the inside of the dryer. Bridge these strips with a wet cloth or a finger. ➔ If a continuous beep tone is heard and an alphanumeric number is displayed on the console, the sensor is OK. ➔ If not, or if a continuous beep tone is heard before bridging the moisture strips, go to TEST #5, page 8. DIAGNOSTIC: Motor, Heater, and Console ID Close the door. Press the Start button. The motor and heater will turn on. Continuing to press the Start button will display the project codes and software revisions. ➔ If the motor does not turn on, go to TEST #3, page 5. ➔ If no heat is detected, go to TEST #4, page 6.
Transcript
TECH SHEET - DO NOT DISCARD PAGE 1
FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10110638
WARNINGElectrical Shock Hazard
Disconnect power beforeservicing.Replace all parts andpanels before operating.Failure to do so canresult in death orelectrical shock.
ESD problems are present everywhere.ESD may damage or weaken themachine control electronics. The newcontrol assembly may appear to workwell after repair is finished, but failuremay occur at a later date due to ESDstress.
Use an anti-static wrist strap.Connect wrist strap to green groundconnection point or unpainted metalin the appliance -OR- Touch yourfinger repeatedly to a green groundconnection point or unpainted metalin the appliance.
Before removing the part from itspackage, touch the anti-static bag toa green ground connection point orunpainted metal in the appliance.
Avoid touching electronic parts orterminal contacts; handle machinecontrol electronics by edges only.
When repackaging failed machinecontrol electronics in anti-static bag,observe above instructions.
DIAGNOSTIC GUIDEBefore servicing, check the following:
Make sure there is power at the walloutlet.
Has a household fuse blown or circuitbreaker tripped? Time delay fuse?
Is dryer vent properly installed andclear of lint or obstructions?
All tests/checks should be made with aVOM (volt-ohm-milliammeter) or DVM(digital-voltmeter) having a sensitivity of20,000 Ω per volt DC or greater.
Check all connections before replacingcomponents. Look for broken or loosewires, failed terminals, or wires notpressed into connectors far enough.
A potential cause of a control notfunctioning is corrosion onconnections. Observe connections andcheck for continuity with an ohmmeter.
Connectors: Look at top of connector.Check for broken or loose wires. Checkfor wires not pressed into connector farenough to engage metal barbs.
Resistance checks must be made withdryer unplugged or powerdisconnected.
DIAGNOSTIC TESTSThese tests allow service personnel to testand verify all inputs to the machine controlelectronics. You may want to do a quickand overall checkup of the dryer withthese tests before going to specifictroubleshooting tests.
ACTIVATING THE SERVICEDIAGNOSTIC TEST MODE1. Be sure the dryer is in standby mode
(plugged in with all indicators off, orwith only the Done indicator on).
2. Select any one button (exceptPause/Cancel) and follow the stepsbelow, using the same button(remember the button):
a.b.c.d.e.
Press/hold 2 secondsRelease for 2 secondsPress/hold 2 secondsRelease for 2 secondsPress/hold 2 seconds
3. If this test mode has been enteredsuccessfully, all indicators on theconsole are illuminated for 5 secondswith 8:88 showing in the EstimatedTime Remaining three-digit display. Ifthere are no saved fault codes or activefault codes, all indicators on theconsole will momentarily turn off, thenstay on with 8:88 displayed. Continuewith Diagnostics.
4. If entry into diagnostic mode isunsuccessful, choose a different button(except Pause/Cancel) and repeatstep 2.
If no indicators come on afterrepeating step 2 using a differentbutton, go to TEST #1, page 4.
DIAGNOSTIC: Active Fault CodesIf there is an active fault code, it will beflashing in the display. Review the DisplayFault/Error Codes table, page 3, for therecommended procedure.
If there is no active fault code, 8:88 will bedisplayed.
DIAGNOSTIC: Saved Fault CodesIf there are saved fault codes, the mostrecent fault code will show “F:” and flash“XX” where XX is the fault code.
Press andrelease thesame buttonused to activateDiagnostics
beeptone
Second most recentfault code is displayed.
Repeat beeptone
Third most recent faultcode is displayed.
Repeat beeptone
Fourth most recentfault code is displayed.
Repeat All indicators momentarily turnoff, then stay on.
DIAGNOSTIC: Console Buttonsand IndicatorsPressing buttons and rotating the cycleselector will turn off the correspondingindicator and sound a beep as shown infigure 1, page 2. Pressing (more time)will toggle the left digit and colon on thedisplay while sounding a beep. Pressing
(less time) will toggle the right twodigits on the display while sounding abeep.
If indicators fail to come on and beepafter pressing buttons and rotating thecycle selector, go to TEST #7, page 9.
DIAGNOSTIC: Door SwitchOpening the door should cause a beepand an alphanumeric number to bedisplayed. Closing the door should causea beep and 8:88 to be displayed.
If opening the door fails to cause a beepand a number and letter to bedisplayed, go to TEST #8, page 9.
DIAGNOSTIC: Moisture SensorOpen the door and locate two metal stripson the inside of the dryer. Bridge thesestrips with a wet cloth or a finger.
If a continuous beep tone is heard andan alphanumeric number is displayedon the console, the sensor is OK.
If not, or if a continuous beep tone isheard before bridging the moisturestrips, go to TEST #5, page 8.
DIAGNOSTIC: Motor, Heater, andConsole IDClose the door. Press the Start button. Themotor and heater will turn on. Continuingto press the Start button will display theproject codes and software revisions.
If the motor does not turn on, go toTEST #3, page 5.
If no heat is detected, go to TEST #4,page 6.
FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10110638
TECH SHEET - DO NOT DISCARD PAGE 2
Figure 1. Console Diagnostics.
DIAGNOSTIC: Displaying Inlet Air FlowUsed to display the airflow value at the inlet of the heaterbox being measured by the machine control.
After all saved fault codes have been displayed, press theWrinkle Shield button to activate airflow detection. A 30 or50 second countdown timer will start and the dryer will turn on.
If the dryer is cold, the countdown will start at 50 seconds.
NOTE: If the dryer is extremely cold (less than 40°F[4.4°C]) the airflow may not be detected properly, and “--”will be displayed.
If the dryer is hot, the countdown timer will start at30 seconds (cool down period) followed by an additional50 second countdown.
A Dryness Level modifier LED will also be illuminated toindicate the airflow range corresponding to the numberdisplayed.
The More LED will be illuminated for airflow readingsabove 40 cfm.
The Normal LED will be illuminated for airflow readingsbetween 29 and 40 cfm.
The Less LED will be illuminated for airflow readings lessthan 29 cfm.
If airflow value is low (Less LED is lit), check to makesure the lint screen is clean, the door seal is in placeand the vent is not obstructed.
DIAGNOSTIC: Displaying Line VoltageUsed to display the line voltage currently being measured bythe machine control.
After all saved fault codes have been displayed, press theCycle Signal button. The voltage value will be displayed.
If the line voltage is not seen on L2, the display will flash L2. Go toTEST #1, page 4.
DEACTIVATING THE DIAGNOSTIC TEST MODEPress the Pause/Cancel button to exit diagnostics.
ACTIVATING THE MANUAL LOAD TEST1. Be sure the dryer is in standby mode (plugged in with all indicators
off, or with only the Done indicator on).
2. Select any one button (except Pause/Cancel) and follow the stepsbelow, using the same button (remember the button):
Press/hold 2
seconds
Releasefor 2
seconds
Press/hold 2
seconds
Releasefor 2
seconds
Press/hold 2
seconds
Releasefor 2
seconds
Press/hold 2
seconds
The motor starts right away, the “Sensing” Status LED comes on,and “0” (zero) is displayed (this step starts the Manual Loadsequence):
1. Motor turns on. “Sensing” Status LED turns on. 0:00 is displayed.
Now press any key (except Pause/Cancel) and the control willadvance through each step of the following sequence:
2. Motor + full heater. “Damp” Status LED turns on. 0:02 is displayed.
3. Motor + full heater+ drum light.
“Cool Down” Status LEDturns on. 0:03 is displayed.
4. All loads turn off. “Done” Status LED turns on. 0:04 is displayed.
DEACTIVATING THE MANUAL LOAD TESTPress the Pause/Cancel button to exit this mode.
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DISPLAY FAULT/ERROR CODESThe fault codes below would be indicated whenattempting to start a drying cycle, or after activating thediagnostic test mode.
PF flashes to indicate that a power failureoccurred while the dryer was running. Press Start to continue the cycle, or
press Pause/Cancel to clear the display.
F:01Primary Control
Failure
F:01 flashes when there is a primarycontrol failure. Replace the machine control electronics.
See Accessing & Removing theElectronic Assemblies, page 9.
F:02Keypad/
User InterfaceFailure
F:02 flashes when there is a stuck buttonor user interface mismatch. This fault codewill ONLY appear when in the diagnostictest mode. See TEST #7, page 9.
F:22Outlet
ThermistorOpen
F:22 flashes if the outlet thermistor is open. See TEST #4a, page 6.
F:23Outlet
ThermistorShorted
F:23 flashes if the outlet thermistor hasshorted. See TEST #4a, page 6.
F:24Inlet
ThermistorOpen
F:24 flashes if the inlet thermistor is open.This fault code will ONLY appear when inthe diagnostic test mode. See TEST #4a, page 6.
F:25Inlet
ThermistorShorted
F:25 flashes if the inlet thermistor isshorted. This fault code will ONLY appearwhen in the diagnostic test mode. See TEST #4a, page 6.
F:26Motor Drive
System Failure
F:26 flashes if there is a motor drivesystem failure. See TEST #3, page 5.
F:28Moisture
Sensor Open
F:28 flashes if the moisture sensor strip isopen. This fault code will ONLY appearwhen in the diagnostic test mode. See TEST #5, page 8.
F:29MoistureSensorShorted
F:29 flashes if the moisture sensor striphas shorted. This fault code will ONLYappear when in the diagnostic test mode. See TEST #5, page 8.
F:30Restricted
AirflowCondition
F:30 flashes if a restricted airflow conditionexists. This fault code will ONLY appearwhen in the diagnostic test mode. Check to make sure the lint screen is
clean, the door seal is in place and thevent is not obstructed.
See DIAGNOSTIC: Displaying Inlet AirFlow, page 2.
F:70
F:71
NoCommunication
BetweenElectronic
Assemblies
F:70 / F:71 flashes when there is nocommunication between the machinecontrol and the console electronics. Check console electronics harness
connections to the machine control. Replace the machine control electronics.
See Accessing & Removing theElectronic Assemblies, page 9.
F:72through
F:78
ConsoleElectronics
Failure
F:72 through F:78 flashes when there is aconsole electronics failure. Replace the console electronics. See
Accessing & Removing the ElectronicAssemblies, page 9.
Moisture SensorStrips
HeaterAssembly
DoorSwitch
See Accessing & Removing the ElectronicAssemblies, page 9, to access:
See Removing the BackPanel, page 11, to access:
See Removingthe Toe Panel,page 9, to access:
Machine Control ElectronicsUI Power CubeConsole Electronics and Housing
FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10110638
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TROUBLESHOOTING TESTSNOTE: These checks are done with thedryer unplugged or disconnected frompower.
TEST #1 Supply ConnectionsThis test assumes that proper voltage ispresent at the outlet, and visual inspectionindicates that the power cord is securelyfastened to the terminal block (electricdryer) or wire harness connection (gasdryer).
ELECTRIC DRYER:
1. Unplug dryer or disconnect power.
2. Remove the cover plate from the topright corner of the back of the dryer.See figure 3.
3. With an ohmmeter, check for continuitybetween the neutral (N) terminal of theplug and the center contact on theterminal block. See figure 4.
If there is no continuity, replace thepower cord and test the dryer.
If there is continuity, go to step 4.
4. In a similar way, check which terminalof the plug is connected to theleft-most contact on the terminal blockand make a note of it. This will be L1(black wire) in the wiring diagram. Seefigure 4.
When this is found, go to step 5.
If neither of the plug terminals havecontinuity with the left-most contactof the terminal block, replace thepower cord and test the dryer.
5. Access the machine control electronicswithout disconnecting any wiring to thecontrol board. See Accessing &Removing the Electronic Assemblies,page 9.
6. With an ohmmeter, check for continuitybetween the L1 terminal of the plug(found in step 4) and P9-2 (black wire)on the machine control board. Seefigure 17, page 10.
If there is continuity, go to step 7.
If there is no continuity, check thatwires to the terminal block aremechanically secure. If so, replacethe main wire harness and test thedryer.
7. Check for continuity between theneutral (N) terminal of the plug andP8-3 (white wire) on the machinecontrol board.
If there is continuity, go to step 8.
If there is no continuity and themechanical connections of the wireare secure, replace the main wireharness.
8. Visually check that the P5 connector isinserted all the way into the machinecontrol electronics.
9. Visually check that the consoleelectronics and housing assembly isproperly inserted into the front console.
10. If both visual checks pass, replace theconsole electronics and housingassembly.
13. If indicators still do not light, performTEST #2, page 5.
GAS DRYER:
1. Unplug dryer or disconnect power.
2. Remove the cover plate from the topright corner of the back of the dryer.See figure 3.
3. Check that the power cord is firmlyconnected to the dryer’s wire harness.See figure 5.
4. Access the machine control electronicswithout disconnecting any wiring to thecontrol board. See figure 16, page 10.
5. With an ohmmeter, check for continuitybetween the neutral (N) terminal of theplug and P8-3 (white wire) on themachine control board. The left-handside of figure 6 shows the position of theneutral terminal (N) on the power cordplug. Also see figure 17, page 10.
If there is continuity, go to step 6.
If there is no continuity, disconnectthe white wire of the harness fromthe power cord at the locationillustrated in figure 5. Test thecontinuity of the power cord neutralwire as illustrated in figure 6. If anopen circuit is found, replace thepower cord. Otherwise, go to step 6.
6. In a similar way, check the continuitybetween the L1 terminal of the plugand P9-2 (black wire) on the controlboard.
If there is continuity, go to step 8.
If there is no continuity, check thecontinuity of the power cord in asimilar way to that illustrated infigure 6, but for power cord’s L1wire.
If an open circuit is found, replace thepower cord. Otherwise, replace themain harness.
7. Visually check that the P5 connector isinserted all the way into the machinecontrol electronics.
8. Visually check that the consoleelectronics and housing assembly isproperly inserted into the front console.
9. If both visual checks pass, replace theconsole electronics and housingassembly.
12. If indicators still do not light, performTEST #2, page 5.
COM
N
N
G
G
L1
Power CordPlug
L1
Figure 6. Power cord terminals, gasdryer.
RemoveScrew
Cover Plate
Figure 3. Remove the cover plate.
COM
N L1Power Cord
PlugTerminal Block
Figure 4. Plug-to-terminal connectionsfor electric dryer.
WireHarness
Power Cord
Figure 5. Power cord-to-wire harnessconnection for gas dryer.
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FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10110638
TEST #2 Machine ControlPower CheckThis test is used to determine if power ispresent at the machine control electronics.This test assumes that TEST #1 has beencompleted.
NOTE: The drum light is controlled by themachine control on all models.
1. Plug in dryer or reconnect power.
2. Open the door.
If the drum light illuminates, thenpower is present at the machinecontrol. Go to TEST #6, page 8.
If the drum light fails to illuminate,the problem may be as simple as abad bulb. Replace bulb with aworking bulb. If drum light still fails toilluminate, continue with step 3.
TEST #3 Motor CircuitThis test will check the wiring to the motorand the motor itself. The following itemsare part of this motor system:
Part of Motor System ElectricDryer
GasDryer
Harness/connection
Thermal fuse noBelt/belt switch
Drive Motor
Centrifugal switch
Door switch
Machine control electronics.See ESD information, page 1.
1. Unplug dryer or disconnect power.
2. Access the machine control electronicsand measure the resistance acrossP8-4 and P9-1. See Accessing &Removing the Electronic Assemblies,page 9.
If resistance across P8-4 and P9-1 isin the range of 1 to 6 ohms, replacethe machine control electronics.
Otherwise, go to step 3.
3. Check the wiring and components inthe path between these measurementpoints by referring to the appropriatewiring diagram (gas or electric) onpage 12.
ELECTRIC DRYER ONLY: Check thethermal fuse. See TEST #4b, page 7.
ALL DRYERS: Continue with step 4below to test the remainingcomponents in the motor circuit.
4. Check the belt switch and drive motor.Access the belt switch and drive motorby removing the back panel. SeeRemoving the Back Panel, page 11.Slowly remove the drum belt from thespring-loaded belt switch pulley, gentlyletting the belt switch pulley down. Seefigure 7.
5. Remove the white connector from thedrive motor switch. See figure 8.
6. Using figure 9, check for the resistancevalues of the motor’s Main and Startwinding coils as shown in the followingtable.
NOTE: Main and Start winding coilsmust be checked at the motor.
Winding Resistance Contact Pointsof Measurement
MAIN 3.3–3.6
Lt. blue wire in back atpin 4 and bare copper wire
on pin 5 of black drivemotor switch
START 2.7–3.0
Lt. blue wire in back atpin 4 and bare copper wire
on pin 3 of black drivemotor switch
If the resistance at the motor iscorrect, there is an open circuitbetween the motor and machinecontrol electronics. Check for failedbelt switch.
If the Start winding resistance ismuch greater than 3 Ω, replace themotor.
7. Check the belt switch by measuringresistance between the two light bluewires, as shown in figure 10, whilepushing up the belt switch pulley.
If the resistance reading goes frominfinity to a few ohms as pulley armcloses the switch, belt switch is OK.If not, replace the belt switch.
If belt switch is OK and there is stillan open circuit, check and repair thewiring harness.
8. Door Switch problems can beuncovered in the Door SwitchDiagnostic Test, page 1; however, if thiswas not done, the following can bedone without applying power to thedryer. Connect an ohmmeter acrossP8-3 (neutral, white wire) and P8-4(door, tan wire).
DrumBelt
Belt Switch Pulley
Figure 7. Slowly remove drum belt.
WhiteConnector
Drive MotorSwitch
15
34
62
Figure 8. Remove white connector.
Main Winding:Lt.
and Bare Copper WireBlue Wire in Back
Start Winding:Lt.
andBare Copper
Wire
Blue Wirein Back
15
34
62
Figure 9. Main and start windingmeasure points.
Lt. BlueWires
Belt SwitchBelt Switch
Pulley
15
34
62
Figure 10. Checking the belt switch.
FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10110638
TECH SHEET - DO NOT DISCARD PAGE 6
With the door properly closed, theohmmeter should indicate a closedcircuit (0–2 Ω).
If not, replace the door switchassembly.
TEST #4 HeaterThis test is performed when either of thefollowing situations occur:
Dryer does not heat Heat will not shut off
This test checks the components makingup the heating circuit. The following itemsare part of this system:
Part of Heating System ElectricDryer
GasDryer
Harness/connection
Heater relay
Thermal cut-off
Thermal fuse no
Inlet thermistor/high limitthermostat assembly
no
high limit thermostat no
Heat element assembly noGas burner assembly no
Centrifugal switch
Outlet thermistor
Machine control electronics.See ESD information, page 1.
Console electronics andhousing assembly
Gas supply no
Dryer does not heat:Locate the components using figure 11.
ELECTRIC DRYER:
1. Unplug dryer or disconnect power.
2. Remove the toe panel to access thethermal components. See Removingthe Toe Panel, page 9.
3. Using an ohmmeter and referring to thewiring diagram, measure the resistancefrom the red wire terminal at thethermal cut-off to the red wire terminalat the heater.
If the resistance is about 10 Ω, go tostep 5.
If an open circuit is detected, go tostep 4.
4. Visually check the wire connections tothe thermal cut-off, high limitthermostat, and heater. If connectionslook good, check for continuity acrosseach of these components.
Replace the heater if it is electricallyopen.
Replace both the thermal cut-off andinlet thermistor/high limit thermostat
assembly if either the thermal cut-offor the high limit thermostat iselectrically open.
5. If no open circuit is detected, removethe P4 connector, then measure theresistance between P4-3 (red wire) andP4-6 (red wire) at the connector. Seefigure 17, page 10 for connectorlocation; and Accessing & Removingthe Electronic Assemblies, page 9.
If 5–15 kΩ are measured, replace themachine control electronics.
If the resistance is less than 1 kΩ,replace the outlet thermistor.
GAS DRYER:
1. Unplug dryer or disconnect power.
2. Remove the toe panel to access thethermal components. See Removing theToe Panel, page 9.
3. Perform TEST #4b, page 7. If thethermal fuse is OK, go to step 4.
4. Perform TEST #4c, page 7. If thethermal cut-off is OK, go to step 5.
5. Locate the high limit thermostat. Seefigure 11. Measure the continuitythrough it by connecting the meterprobes on the red wire and black wireterminals.
If there is an open circuit, replace thehigh limit thermostat and the thermalcut-off.
Otherwise, go to step 6.
6. Perform TEST #4d, page 8. If this is OK,replace the machine control electronics.
Heat will not shut off:1. Unplug dryer or disconnect power.
2. Access the machine control electron-ics. See figure 17, page 10 for connec-tor location; and Accessing & Remov-ing the Electronic Assemblies, page 9.
ELECTRIC DRYER: Remove the P4connector, then measure the resistancebetween P4-3 (red wire) and P4-6 (redwire) at the connector.
GAS DRYER: Remove the P14connector, then measure the resistancebetween P14-3 (red-white wire) andP14-6 (red-white wire) at the connector.
ALL DRYERS:
If 5–15 kΩ are measured, replace themachine control electronics.
If the resistance is greater than20 kΩ, replace the outlet thermistor.
TEST #4a Thermistors
Outlet ThermistorThe machine control electronics monitorsthe exhaust temperature using the outletthermistor, and cycles the heater relay onand off to maintain the desired temperature.
Begin with an empty dryer and a clean lintscreen.
1. Plug in dryer or reconnect power.
2. Start the Timed Dry cycle.
3. If after 60 seconds, F:22 or F:23flashes in the display and the dryershuts off, the thermistor or wire harnessis either open or shorted.
Unplug dryer or disconnect power.
Check wire connections at themachine control electronics andthermistor. See Accessing &
Figure 11. Thermal Components,viewed from front.
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Removing the Electronic Assemblieson page 9, and for thermistorlocation see figure 11, page 6.
If wire connections are OK, checkthe outlet thermistor resistance perstep 5, page 7.
4. If F:22 or F:23 does not flash in thedisplay, the connections to thethermistor are good. Therefore, checkthe exhaust temperature value at any orall of the temperature levels inquestion, using the Timed Dry cycle,and the following process:
Hold a glass bulb thermometer capableof reading from 90° to 180°F (32° to82°C) in the center of the exhaustoutlet. The correct exhausttemperatures are as follows:
EXHAUST TEMPERATURES
TEMPERATURESETTING
HEAT TURNSOFF*
°F (°C)HEAT TURNS ON
°F (°C)
High 155°±5°(68°±3°)
10–15° (6–8°)below the
heat turn offtemperature
Medium 140°±5°(60°±3°)
Low 125°±5°(52°±3°)
Extra Low 105°±5°(41°±3°)
* The measured overshoot using theglass bulb thermometer in the exhaustoutlet can be 30°F (17°C) higher.
5. If the exhaust temperature is not withinspecified limits, or you have come herefrom step 3, perform the following:
NOTE: All thermistor resistancemeasurements must be made whiledryer is unplugged or disconnectedfrom power.
ELECTRIC DRYER: Remove the P4connector, then measure the resistancebetween P4-3 (red wire) and P4-6 (redwire) at the connector.
If the resistance is OK, check P4-3and P4-6 to machine ground.
If resistance is greater than 0 (zero),replace wiring harness.
GAS DRYER: Remove the P14connector, then measure the resistancebetween P14-3 (red-white wire) andP14-6 (red-white wire) at the connector.
If the resistance is OK, check P14-3and P14-6 to machine ground.
If resistance is greater than 0 (zero),replace wiring harness.
ALL DRYERS:
The following table gives temperaturesand their associated resistance values.
OUTLET THERMISTOR RESISTANCE
TEMP.°F (°C)
RES.RANGE
kΩ
TEMP.°F (°C)
RES.RANGE
kΩ
50° (10°) 19.0–22.0 80° (27°) 8.5–10.5
60° (16°) 14.8–16.8 90° (32°) 6.8–8.8
70° (21°) 11.5–13.5 100° (38°) 5.0–7.0
If the thermistor resistance does notagree with table, replace the outletthermistor.
If the thermistor resistance checksagree with the measurements in thetable, replace the machine controlelectronics.
Inlet Thermistor, Electric DryerThe machine control electronics monitorsthe inlet temperature using an inletthermistor that is part of the high limitthermostat assembly.
1. Activate the diagnostic test mode. Seeprocedure on page 1.
2. If F:24 or F:25 is a displayed error in thediagnostic test mode, the inletthermistor or wire harness is eitheropen or shorted.
Unplug dryer or disconnect power.
Check wire connections at themachine control electronics and inletthermistor. See Accessing &Removing the ElectronicAssemblies, page 9, and for inletthermistor location see figure 11,page 6.
If wire connections are good,remove the wires from the inletthermistor/high limit thermostatassembly and replace the assembly.
Plug in dryer or reconnect power.
3. If F:24 or F:25 is not an error that isdisplayed in the diagnostic test mode,the connections to the thermistor aregood. Therefore, check the thermistor’sresistance value, using the followingprocess:
Unplug dryer or disconnect power.
Access the heater assembly. Seefigure 2, page 3; and Removing theToe Panel, page 9.
Hold a glass bulb thermometercapable of reading from 68° to 176°F(20° to 80°C) in the heater assembly.
Check the resistance of the inletthermistor. See figure 11, page 6 forlocation.
INLET THERMISTOR RESISTANCE
TEMP.°F (°C)
RES.RANGE
kΩ
TEMP.°F (°C)
RES.RANGE
kΩ
68° (20°) 61.2–63.7 131° (55°) 14.6–15.3
77° (25°) 49.0–51.0 140° (60°) 12.1–12.8
86° (30°) 39.5–41.1 149° (65°) 10.2–10.7
95° (35°) 32.0–33.3 158° (70°) 8.5–9.0
104° (40°) 26.1–27.2 167° (75°) 7.2–7.6
113° (45°) 21.4–22.3 176° (80°) 6.1–6.5
122° (50°) 17.6–18.5
The table above shows the resistancevalues that should be observed for thevarious temperatures at the heaterassembly.
If the thermistor resistance does notagree with the measurements in thetable, replace the inlet thermistor/high limit thermostat assembly.
If the thermistor resistance agreeswith the measurements in the table,replace the machine controlelectronics.
TEST #4b Thermal FuseELECTRIC DRYER: The thermal fuse iswired in series with the dryer drive motor.
GAS DRYER: The thermal fuse is wired inseries with the dryer gas valve.
ALL DRYERS:
1. Unplug dryer or disconnect power.
2. Access the thermal fuse by firstremoving the toe panel. See Removingthe Toe Panel, page 9; and for thermalfuse location see figure 11, page 6.
3. Using an ohmmeter, check thecontinuity across the thermal fuse.
If the ohmmeter indicates an opencircuit, replace the failed thermalfuse.
TEST #4c Thermal Cut-OffIf the dryer does not produce heat, checkthe status of the thermal cut-off.
1. Unplug dryer or disconnect power.
2. Access the thermal cut-off by firstremoving the toe panel. See Removingthe Toe Panel, page 9.
3. Using an ohmmeter, check thecontinuity across the thermal cut-off.See figure 11, page 6 for location.
4. If the ohmmeter indicates an opencircuit, perform the following:
ELECTRIC DRYER: Replace the failedthermal cut-off and inlet thermistor/highlimit thermostat assembly. In addition,check for blocked or improper exhaustsystem, or failed heat element.
FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10110638
TECH SHEET - DO NOT DISCARD PAGE 8
GAS DRYER: Replace the failedthermal cut-off and high limitthermostat. In addition, check forblocked or improper exhaust system.
TEST #4d Gas Valve, GasDryer1. Unplug dryer or disconnect power.
2. Access the gas valve by removing thetoe panel. See Removing the ToePanel, page 9.
3. Use an ohmmeter to determine if agas valve coil has failed. Removeharness plugs. Measure resistanceacross terminals. Readings shouldmatch those shown in the followingchart. If not, replace coil.
Terminals Resistance
1 to 2 1365 ± 601 to 3 560 ± 254 to 5 1325 ± 55
IMPORTANT:Be sure all harnesswires are looped backthrough the strain reliefafter checking or replacing coils.
TEST #5 Moisture SensorNOTE: This test is started with themachine completely assembled.
This test is performed when an automaticcycle stops too soon, or runs much longerthan expected.
NOTE: Dryer will shut down automaticallyafter 2½ hours.
The following items are part of this system:
Harness/connection
Metal sensor strips
Machine control electronics. See ESDinformation, page 1.
1. Activate the diagnostic test mode andadvance past saved fault codes. Seeprocedure on page 1.
2. Open the dryer door. The dryer willbeep and an alphanumeric numberwill be displayed.
3. Locate the two metal sensor strips onthe face of the lint screen housing.Bridge these strips with a wet cloth orfinger.
If a beep tone is heard and analphanumeric number is displayedon the console, the sensor passesthe test. Go to step 9.
If a beep tone is not heard, or acontinuous beep tone is heardbefore bridging the moisture strips,continue with step 4.
NOTE: Over drying may be caused bya short circuit in the sensor system.
4. Access the moisture sensor wires byremoving the toe panel. See Removingthe Toe Panel, page 9. Disconnect thesensor wires from the harness. Seefigure 12.
5. Access the machine controlelectronics. See Accessing &Removing the Electronic Assemblies,page 9. Remove connector P13 fromthe circuit board. Check the mainharness connections between thesensor harness and machine controlfor a short or open circuit.
Replace the main harness ifnecessary.
If harness is OK, continue with step 6.
6. Measure the resistanceacross the outermostcontacts of the cable thatincludes the two red MOVs.
If a small resistance is measured,check for debris across moisturestrips inside of the drum; clean ifdebris is present. If debris is notpresent, replace sensor harness.
If a small resistance is not measured,continue with step 7.
7. Measure the resistance acrosseach of the outermostcontacts and the centerterminal (ground connection).
If a resistance less than infinity ismeasured, replace the sensorharness.
8. If moisture sensor diagnostic testpasses, check the thermistor: PerformTEST #4a, page 6.
If the problem persists afterreplacing the moisture sensor andthermistor, replace the machinecontrol electronics.
TEST #5a AdjustingCustomer-Focused DryingModesNOTE: If the customer is complainingabout the clothes being damp and themoisture sensor passes TEST #5, step 3,the total dry time can be lengthened bychanging from a “CF1” (standard auto cy-cle) to a “CF2” (15% more drying time) or“CF3” (30% more drying time) auto cycle.
1. Activate the diagnostic test mode, andadvance past saved fault codes. SeeActivating the Diagnostic Test Mode,page 1.
2. In diagnostic test mode, press and holdthe Dryness Level button for 5seconds. The dryer will beep and thecurrent drying mode will be seen onthe display. The factory default valueis “CF1”.
3. To select a different drying mode, pressthe Dryness Level button again. Thedryer display will flash and show CF2,CF3, or CF1.
4. With the display flashing the selectedauto cycle mode, press the Start buttonto save the drying mode and exitdiagnostics (the Start button in thismode does not start a drying cycle).The result will be stored in EEPROM ofthe control board, and will be retainedafter a power loss.
5. Press the Pause/Cancel button at anytime to cancel changes and exit fromthis mode.
TEST #6 Power CubeThis test is performed when:
None of the indicators light up No beep sound is heard
1. Unplug dryer or disconnect power.
2. Check to make sure the connector isfully inserted in the power cube boardat P1.
3. Using an ohmmeter and referring to theappropriate wiring diagram on page 11,and figure 17 on page 10, check to besure there is continuity between P2-1on the power cube board and P003-3on the console electronics userinterface board.
If all connections are good, go toTEST #7, page 9.
BlowerHousing
Drum
FRONT
HarnessConnection
MOVs(Metal Oxide
Varistors)
Figure 12. Disconnect sensor from wireharness.
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FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10110638
If TEST #7 fails also, replace theUI power cube and the consoleelectronics and housing assembly.See Accessing & Removing theElectronic Assemblies, at right.
TEST #7 Buttons andIndicatorsThis test is performed when any of thefollowing situations occurs during theConsole Buttons and Indicators DiagnosticTest, page 1:
None of the indicators light up No beep sound is heard Some buttons do not light
indicators
None of the indicators light up:1. See Diagnostic Guide/Before
Servicing... on page 1.
2. Perform Test #1, page 4 to verifysupply connections.
3. Perform steps in Accessing andRemoving the Electronic Assemblies, atright, and visually check that the P5connector is inserted all the way intothe machine control electronics.
4. Visually check that the consoleelectronics and housing assembly isproperly inserted into the front console.
5. If both visual checks pass, replace theconsole electronics and housingassembly.
1. Perform steps in Accessing andRemoving the Electronic Assemblies, atright, and visually check that the P5connector is inserted all the way intothe machine control electronics.
If visual check passes, replace theconsole electronics and housingassembly.
Some buttons do not lightindicators:1. Perform steps in Accessing and
Removing the Electronic Assemblies, atright, and visually check that theconsole electronics and housingassembly is properly inserted into thefront console.
If visual check passes, replace theconsole electronics and housingassembly.
TEST #8 Door SwitchActivate the diagnostic test mode asshown on page 1, and perform the DoorSwitch Diagnostic test, page 1. Functional-ity is verified with a beep each time thedoor is closed and opened, and an alpha-numeric number appears in the display.
If any of the above conditions are not met:
Unplug dryer or disconnect power.
Check that the wires between the doorswitch and machine control electronicsare connected. See figure 13 for switchlocation, and see Accessing andRemoving the Electronic Assemblies, atright.
If the connections are OK, replace thewire and door switch assembly andretest.
If wire and door switch assembly havebeen replaced and dryer still does notstart, replace the machine controlelectronics.
REMOVING THE TOE PANEL1. Unplug dryer or disconnect power.
2. Remove two screws below the toepanel.
3. Slide the toe panel down, then pull itout from the bottom. See figure 14.
ACCESSING & REMOVINGTHE ELECTRONICASSEMBLIESThere are three electronic assemblies: theMachine Control Electronics, the UI PowerCube, and the Console Electronics andHousing. See figure 15.
1. Unplug dryer or disconnect power.
2. Remove the three rear screws from thetop panel, and slide the top panel tothe rear to remove.
Machine Control Electronics
1. Perform preceding steps 1 and 2, thenremove the two screws that hold themachine control electronics bracket inplace.
2. Slide the bracket over the top of thedrum to access the machine controlelectronics connectors and mountingscrew. See figure 16.
Figure 13. Door switch location.
Figure 15. Locate the electronicassemblies.
Flange
Figure 14. Pull the toe panel down toclear flange, then pull panel out.
FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10110638
TECH SHEET - DO NOT DISCARD PAGE 10
3. Remove all the wire connections to themachine control electronics. Seefigure 17.
4. Remove the screw holding the machinecontrol electronics assembly to themounting bracket. See figure 16.
5. There are two plastic legs on the frontof the machine control electronics thatslide under the mounting bracket.
There is one plastic leg on the rear ofthe machine control electronics thatslides under the mounting bracket.
There is a locking tab on the bottomof the machine control electronicsthat snaps into the mounting bracket.
Press the locking tab on the bottom ofthe machine control electronics andslide the assembly to the front, then lift.
3. Gently remove the decorative trim thatsurrounds the door and upper consoleby unsnapping it from the machine.See figure 19.
UI Power Cube
1. Perform steps 1 and 2 under Accessingand Removing the ElectronicAssemblies, page 9.
2. Remove all wire connections to the UIpower cube. See figure 17.
3. Remove the screw holding the UIpower cube to the mounting bracket.See figure 16.
4. There are two plastic legs on the frontof the UI power cube that slide underthe mounting bracket. Slide cube outand remove.
Console Electronics and HousingAssembly
The console panel must be removed toaccess the console electronics andhousing assembly.
1. Perform steps 1 and 2 under Accessing& Removing the ElectronicsAssemblies, page 9, and disconnect theP2 harness from the machine control,and the P2 connector from the UI powercube.
2. Remove the screw that fastens theassembly to the machine controlmounting bracket (figure 16), and thetwo screws that fasten the consoleassembly to the machine (figure 18).
Figure 17. UI Power Cube and Machine control electronics.
Figure 16. Remove machine controlelectronics from mounting bracket.
Figure 18. Remove the console panelto access the console electronics andhousing assembly.
Figure 19. Remove the decorative trim.
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FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10110638
4. Slide the console up and off of themachine. See figure 18, page 10.
5. The console mounting bracket isfastened to the console front panel withtwo latches at both sides of the consoleassembly. Unlatch the bracket gentlywith a screwdriver while pulling themounting bracket assembly out. Seefigure 18, page 10.
6. The console electronics is split into twoassemblies connected by two cables.Each assembly is fastened to thedecorative piece by four plastic latches.To remove these assemblies, gentlycompress the plastic latches whilepulling up on the assembly. For thecycle selector assembly, the cycleselector knob must first be removed byfirmly pulling on it or gently prying itstraight upward. See figure 20.
1M 2M 3M 5M 6M
= Contacts closed
Contacts
Function
Start
Run
Centrifugal Switch(Motor)
Black
Blue
BlueWHITE
White
White
Gas Valve, Gas Dryer
Black-WhiteLt. Blue
Green-Yellow
RedRed
Pluggable Drive Motor Switch
SOFTWARE COPYRIGHTED.MANUFACTURED UNDER ONE OR MORE
OF THE FOLLOWING U.S. PATENTS:
4669200470049547545564840285486536648994644908959
4989347506605055601205809828602069860474866199300
6446357659714466042986685241673244767846736819255
D314261D314262D457991D457992D495453
REMOVING THE BACKPANEL1. Unplug dryer or disconnect power.
2. Remove the three rear screws from thetop panel, and slide the top panel tothe rear to remove.
3. Remove the cover plate, disconnect thepower cord, and remove ground screw.
4. Remove the metal spring clip betweenthe back panel and the exhaust outlet.See figure 21.
5. Remove the ten screws on the rear,and two screws on the top of the backpanel. Pull the back panel off themachine.
ELECTRIC DRYER: In addition to theabove, remove the terminal block from theback panel.
