TECH SHEET – DO NOT DISCARD |
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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.
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 ohms 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 factory or 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 DIAGNOSTIC TEST MODE
1.Be sure the dryer is in standby mode (plugged in and all indicators off).
2.Press the following button sequence:
+ (more time), – (less time), + (more time),
– (less time), all within 5 seconds.
3.All indicators on the console are illuminated with 88 showing in the Estimated Time Remaining (two-digit) display, if this test mode has been entered successfully.
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.
■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 electronic control assembly by edges only.
■When repackaging failed electronic control assembly in anti-static bag, observe above instructions.
If unsuccessful entry into diagnostic mode, actions can be taken for specific indications:
Indication 1: None of the indicators or display turns on.
Action: Select any manual cycle.
If indicators come on, then try to change the dryer time by pressing the + and – buttons. If either button fails to change the time, something is faulty with one of those buttons, and it is not possible to enter the diagnostic mode. Remove the console electronics and housing. See Accessing & Removing the Electronic Assemblies, page 7.
If no indicators come on after pressing the Manual cycle buttons, go to
TEST #1, page 3.
Indication 2: E1 or E2 flashes from the display.
Action: Proceed to TEST #3a, page 4.
Indication 3: E3 flashes from the display.
Action: Check that the correct machine control electronics and console electronics and housing are installed. Do so by removing these components to view the part numbers and compare them to the part numbers in the Service Parts List
for this unit. See Accessing & Removing the Electronic Assemblies, page 7. Replace components if necessary.
Diagnostic: Console switches and indicators
Pressing each button or turning the cycle selector to each cycle should cause a beep tone and control one or more LEDs as shown in figure 1, page 3. Pressing the Hold To Start button will also control the motor and heater, while the two-digit display will indicate a software project i.d. number.
Diagnostic: Moisture Sensor
Locate two metal strips on the face of the lint screen housing. Bridge these strips with a wet cloth or a finger.
If a beep is heard and a software revision number is displayed on the console, the sensor is OK.
If not, or if a beep tone is heard before bridging the moisture strips, go to TEST #4, step 2, page 5.
Diagnostic: Door Switch
Opening the door should cause a beep tone and a number and letter to be indicated in the two-digit display. Closing the door firmly should cause a beep tone and the display to go blank or indicate 88.
DISPLAY FAULT/ERROR CODES
The error codes below would be indicated when attempting to start a drying cycle, or after activating the diagnostic test mode.
DISPLAY |
DESCRIPTION |
EXPLANATION AND RECOMMENDED PROCEDURE |
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PF |
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PF flashes to indicate that a power failure occurred while the dryer |
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POWER FAILURE |
was running. Press HOLD TO START to continue the cycle, or press |
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OFF/Pause to clear the display. |
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1 |
THERMISTOR OPEN |
E1 flashes if the thermistor is open. See TEST #3a, page 4. |
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E |
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E2 |
THERMISTOR SHORTED |
E2 flashes if the thermistor has shorted. See TEST #3a, page 4. |
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E3 |
USER INTERFACE OR |
E3 flashes when there is a keyswitch or software mismatch. This |
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error code will ONLY appear when in the diagnostic test mode. |
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SOFTWARE MISMATCH |
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See TEST #5, page 6. |
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FOR SERVICE TECHNICIAN’S USE ONLY |
PART NO. 8563816 REV. B |
PAGE 2 |
TECH SHEET – DO NOT DISCARD |
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ELECTRIC DRYER WIRING DIAGRAM
IMPORTANT: Electrostatic (static electricity) discharge may cause damage to electronic control assemblies. See page 1 for details.
L1 LINE – BK |
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R – LINE L2 |
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240 VOLTS |
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120 VOLTS |
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W – NEUTRAL |
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NEUTRAL |
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BK |
DL |
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BR |
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TERMINAL |
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LINKED TO |
DRUM LAMP |
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CABINET |
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W |
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DOOR |
P1-3 |
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BU |
BU |
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W |
BK |
P1-5 |
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DOOR |
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L1 |
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P1-2 NEUTRAL |
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W |
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SWITCH |
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NEUTRAL |
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USER INTERFACE |
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P3 |
MOTOR |
P1-4 |
LBU |
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LBU |
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W |
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THERMAL FUSE |
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(ACTIVE OVERLAY or |
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P1-1 |
G-Y |
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PT-1 |
196° F (91° C) |
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5M |
CENTRIFUGAL SWITCH 2M |
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ALTERNATE TECHNOLOGY) |
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P4 |
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MAIN |
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MOIST. |
P2-1 Y-R |
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4M |
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2.4–3.6 |
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START |
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BELT |
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G-Y |
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2.4–3.8 |
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SENSOR |
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SWITCH |
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3M |
6M |
1M |
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P2-2 |
BK |
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MOIST RTN |
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DRIVE MOTOR |
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SENSOR |
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MODEL |
P2-3 |
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1/3 H.P. |
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HEATER |
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MOVS |
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N.O. |
RELAY |
MODEL RTN |
P2-4 |
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THERMISTOR |
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HEATER +V |
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TEMP. |
P2-5 R-W |
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(0.250 TERMINAL) |
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COM |
HEATER RTN |
TEMP RTN |
P2-6 |
BK |
10k |
± 3% |
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(0.250 TERMINAL) |
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N.C. |
P2-7 |
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ELECTRONIC |
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NC |
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CONTROL |
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R |
BK |
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R-W |
R |
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HIGH LIMIT |
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THERMAL CUT-OFF |
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THERMOSTAT |
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HEATER |
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(TCO) 352° F (178° C) |
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295° F (146° C) |
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7.8–11.8 |
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TROUBLESHOOTING GUIDE
Some tests will require accessing components. See figure 13, page 7 for component locations.
PROBLEM |
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POSSIBLE CAUSE / TEST |
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NOTE: Possible Cause/Tests MUST be performed in the sequence shown for each problem. |
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WON’T POWER UP. |
1. |
Supply Connections. See TEST #1, page 3. |
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(No response when Control |
2. |
Check harness connections. |
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On button is pressed.) |
3. |
Console electronics and housing. See TEST #5, page 6. |
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WON’T START CYCLE |
1. |
If number display flashes, check to be sure the door is completely shut, |
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and press and hold down HOLD TO START for about 1 second. |
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WHEN HOLD TO START |
2. |
See TEST #2, page 3. |
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BUTTON IS PRESSED. |
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3. |
See TEST #6, page 6. |
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WON’T SHUT OFF WHEN |
1. |
Check OFF/Pause button. See TEST #5, page 6. |
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2. |
Console electronics and housing. See TEST #5, page 6. |
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EXPECTED. |
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3. |
Moisture Sensor. See TEST #4, page 5. |
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CONTROL WON’T ACCEPT |
Console electronics and housing. See TEST #5, page 6. |
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SELECTIONS. |
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1. |
Heater. See TEST #3, page 4. |
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WON’T HEAT. |
2. |
Check harness connections. |
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3. |
Check installation. |
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HEATS IN AIR CYCLE. |
Thermistor. See TEST #3a, page 4. |
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SHUTS OFF BEFORE |
Moisture Sensor. See TEST #4, page 5. |
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CLOTHES ARE DRY. |
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Drum Size: |
Drum Speed: |
7.0 cubic feet |
51.5 ± 3 RPM CW |
Contacts
Function 1M 2M 3M 5M 6M
Start
Run
= Contacts closed
Centrifugal Switch (Motor)
Blue White
Green-
Yellow
Red |
Red |
Pluggable Drive
Motor Switch
PART NO. 8563816 REV. B |
FOR SERVICE TECHNICIAN’S USE ONLY |
TECH SHEET – DO NOT DISCARD |
PAGE 3 |
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Controls Status LEDs, |
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and turns on dryer |
Start button |
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controls these |
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LEDs |
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This button controls |
This button controls |
Each button controls |
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Cycle selector |
the left digit |
the right digit |
all LEDs above button |
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Control On |
controls LED |
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Turns off all LEDs |
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button controls |
where pointing |
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and exits |
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t h i s L E D |
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diagnostic mode |
Figure 1. |
Console Diagnostics |
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TROUBLESHOOTING TESTS
NOTE: These checks are done with the dryer unplugged or disconnected from power.
TEST #1 Supply Connections
This test assumes that proper voltage is present at the outlet, and visual inspection indicates that the power cord is securely fastened to the terminal block.
1.Unplug dryer or disconnect power.
2.Remove the cover plate from the top right corner of the back of the dryer. See figure 2.
Remove
Screw
Terminal
Block Cover
Figure 2. Remove the cover plate.
3.With an ohmmeter, check for continuity between the neutral (N) terminal of the plug and the center contact on the terminal block. See figure 3.
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Power Cord |
Terminal Block |
N |
Plug |
L1 |
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COM
Figure 3. Plug-to-terminal connections.
If there is no continuity, replace the power cord and test the dryer.
If there is continuity, go to step 4.
4.In a similar way, check which terminal of the plug is connected to the left-most contact on the terminal block and make a note of it. This
will be L1 (black wire) in the wiring diagram. See figure 3.
When this is found, go to step 5.
If neither of the plug terminals have continuity with the left-most contact of the terminal block, replace the power cord and test the dryer.
5.Access the machine control electronics without disconnecting any wiring to the control board. See Accessing & Removing the Electronic Assemblies, page 7.
6.With an ohmmeter, check for continuity between the L1 terminal of the plug (found in step 4) and P1-5 (black wire) on the machine control board.
If there is continuity, go to step 7.
If there is no continuity, check that wires to the terminal block are mechanically secure. If so, replace the main wire harness and test the dryer.
7.Check for continuity between the neutral (N) terminal of the plug and P1-2 (white wire) at the control board.
If there is continuity, go to step 8.
If there is no continuity and the mechanical connections of the wire are secure, replace the main wire harness.
8.If the dryer still does not operate, replace the machine control electronics.
TEST #2 Motor Circuit
This test will check the wiring to the motor and the motor itself. The following items are part of this system:
– Harness/connection |
– Door switch |
– Thermal fuse |
– Machine control |
– Belt/belt switch |
electronics. See ESD |
– Drive Motor |
information, page 1. |
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1.Unplug dryer or disconnect power.
2.Access the machine control electronics. See Accessing & Removing the Electronic Assemblies, page 7. Measure the resistance across P1-3 and P1-4.
If resistance across P1-3 and P1-4 is in the range of 1 to 6 ohms, replace the machine control electronics.
Otherwise, go to step 3.
3.Check the wiring and components in the path between these measurement points by referring to the wiring diagram on page 2.
4.Check the thermal fuse. See TEST #3b, page 5.
5.Check the belt switch and drive motor. Access the belt switch and drive motor by removing the back panel. See Removing the Back Panel, page 8. Slowly remove the drum belt from the spring-loaded belt switch pulley, gently letting the belt switch pulley down. See figure 4.
Belt Switch Pulley |
Drum |
Belt |
Figure 4. Slowly remove drum belt. |
6.Remove the white connector from the drive motor switch. See figure 5.
Drive Motor |
Switch |
White Connector |
Figure 5. Remove white connector. |
FOR SERVICE TECHNICIAN’S USE ONLY |
PART NO. 8563816 REV. B |
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