Whirlpool WGD8600YW0 Parts Diagram

FOR SERVICE TECHNICIAN’S USE ONLY

Voltage Measurement Safety Information

When performing live voltage measurements, you must do the following:

Verify the controls are in the off position so that the appliance does not start when energized.

Allow enough space to perform the voltage measurements without obstructions.

Keep other people a safe distance away from the appliance to prevent potential injury.

Always use the proper testing equipment.

After voltage measurements, always disconnect power before servicing.

IMPORTANT: Electrostatic Discharge (ESD) Sensitive Electronics

ESD problems are present everywhere. Most people begin to feel an ESD discharge at approximately 3000V. It takes as little as 10V to destroy, damage, or weaken the main control assembly. The new main control assembly may appear to work well after repair is finished, but a malfunction 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 main control assembly in anti-static bag, observe above instructions.

IMPORTANT SAFETY NOTICE — “For Technicians only”

This service data sheet is intended for use by persons having electrical, electronic, and mechanical experience and knowledge at a level generally considered acceptable in the appliance repair trade. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible, nor assume any liability for injury or damage of any kind arising from the use of this data sheet.

Contents

Whirlpool Control Panel.........................................	2	Troubleshooting Guide..........................................	8
Diagnostic Guide..................................................	3	Troubleshooting Tests.....................................	9–21
Activating Service Diagnostic Mode......................	3	Voltage Hex Codes Chart....................................	21
User Interface/Control System Test.......................	4	Strip Circuits.......................................................	22
Install Diagnostics.................................................	5	Component Locations.........................................	23
Software Version Display......................................	6	Specifications.....................................................	23
Fault/Error Codes..............................................	6, 7	Wiring Diagrams...........................................	24, 25

DO NOT REMOVE OR DESTROY	PAGE 1
PART NO. W10403269A

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WHIRLPOOL CONTROL PANEL (features and appearances may vary between models)

POWER button: press once to turn off Done	START/Pause button: first press turns off LED
and Sensing indicators. Press twice to exit service	and starts motor, heater, and water valve.
diagnostic mode and return to standby mode.

Rotating the cycle selector knob turns off each	Time Adjust (t)	Time Adjust (s)	Press each modifier	Cycle Signal button:
corresponding cycle indicator. (Features and	button: press once	button: press once	button once to turn off its	press once to turn off the
appearances vary between models).	to turn off right	to turn off left	respective indicator.	EcoMonitor and Check Vent
	segment display.	segment display.		status LEDs.
Figure 1 - User Interface Test

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FOR SERVICE TECHNICIAN’S USE ONLY

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? Was a regular fuse used? Inform customer that a time-delay fuse is required.

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.

Resistance checks must be made with dryer unplugged or power disconnected.

IMPORTANT: Avoid using large diameter probes when checking harness connectors as the probes may damage the connectors upon insertion.

Check all harnesses and connections before replacing components. Look for connectors not fully seated, broken or loose wires and terminals, pin insertion, or wires not pressed into connectors far enough to engage metal barbs.

A potential cause of a control not functioning is corrosion or contamination on connections. Using an ohmmeter, check for continuity across suspected connections.

SERVICE DIAGNOSTIC MODE

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 SERVICE DIAGNOSTIC MODE

1.Be sure the dryer is in standby mode (plugged in with all indicators off).

2.Select any three buttons (except POWER) and follow the steps below, using the same buttons. Remember the buttons and the order that the buttons were pressed.

Within 8 seconds,

•Press and Release the 1st selected button,

•Press and Release the 2nd selected button,

•Press and Release the 3rd selected button;

•Repeat this 3 button sequence 2 more times.

3. If the key sequence was entered successfully, all indicators on the console are illuminated for 5 seconds with “88” showing in the “estimated time remaining” two-digit display. If there are no saved fault codes, all indicators on the console will momentarily turn off, and then only the seven segment display will come back on and display “88”.

NOTE: The Service Diagnostic mode will time out after 10 minutes of user inactivity, or shut down if AC power is removed from the dryer.

Unsuccessful Activation

If entry into diagnostic mode is unsuccessful, refer to the following indications and actions:

Indication 1: None of the indicators or display turn on. Action: Select any cycle.

If indicators come on, try to change the function for the three buttons used to activate the diagnostic test mode. If any button is unable to change the function, something

is faulty with the button, and it will not be possible to enter the diagnostic mode using that button. Replace the user interface and housing assembly.

	SERVICE DIAGNOSTIC MENU TABLE
	Button Press	Function Behavior
1st Button	- Momentary press	- Activates User Interface/
		Control System Test
	- Press and hold for 5 secs.	- Exits Service Diagnostic Mode
2nd Button	- Momentary press	- Activates Install Diagnostics
	- Press and hold for 5 secs.	- Software Version Display
3rd Button	- Momentary press	- Displays Next Error Code
	- Press and hold for 5 secs.	- Clears the Error Codes
DO NOT REMOVE OR DESTROY		PAGE 3

FOR SERVICE TECHNICIAN’S USE ONLY

If no indicators come on after selecting the cycle, go to TEST #1: CCU Power Check, page 9.

Indication 2: Console indicators begin flashing immediately.

Action: If console indicators begin flashing on and off immediately, replace the user interface.

Activation with Saved Fault Codes

If there is a saved fault code, it will be flashing in the display. Review the Fault/Error Codes table on page 7 for the recommended procedure. If there is no saved fault code, “88” will be displayed.

USER INTERFACE/ CONTROL SYSTEM TEST

NOTE: The Service Diagnostic mode must be activated before entering the User Interface/ Control System Test; see procedure on page 3.

Active Fault Code Display

in User Interface/Control System Test

If the display begins flashing while in User Interface/Control System Test, it is displaying an active fault code. Active fault codes are codes that are currently detected. Only one active fault code can be displayed at a time.

Entry Procedure

Press and release the 1st button used to activate Service Diagnostic mode. The following tests will be available:

1. DIAGNOSTIC: Console Buttons and Indicators

Pressing each button will turn off its corresponding indicator(s) or display segment and sound a beep as shown in Figure 1, page 2. Rotating the cycle selector knob turns off each corresponding cycle indicator.

NOTE: A second press of the POWER/Cancel button while in Console Buttons and Indicators mode exits the Service Diagnostic mode and returns the dryer to standby mode.

If indicators do not turn off and beep

after pressing buttons and rotating the cycle selector knob, go to TEST #6: Buttons and Indicators, page 19.

2. DIAGNOSTIC: Console ID, Motor, Heater, and Water Valve (if exists)

Make sure the door is closed, and then press the START button. The dryer will beep and the motor, heater, and water valve (if exists) will turn on. One of the following console IDs will be displayed on the LED by alternating the first two and last two digits (82-00, 84-00, 86-00, or 88-00). Opening the door stops the motor, heater, and water valve.

If the Console ID is not displayed, replace the user interface and housing assembly.

If the motor does not turn on, go to TEST #3: Motor Circuit, page 12.

If no heat is detected, go to TEST #4: Heat System, page 13.

If no water is detected, go to TEST #9: Water Valve, page 20.

3. DIAGNOSTIC: Door Switch/Drum Light

Opening the door should display “7e” (electric) or “79” (gas) and turn on the drum light. Closing the door should turn off the drum light.

If opening the door does not cause “7e” (electric) or “79” (gas) to be displayed, go to TEST #7: Door Switch, page 20.

If opening the door does not turn on the drum light, go to TEST #8: Drum Light, page 20.

4. DIAGNOSTIC: Moisture Sensor

Open the door and locate two metal strips on the face of the lint screen housing. Bridge these strips with a wet cloth or a finger.

If a repeating beep is heard and an alphanumeric number is displayed on the console, the sensor is good.

If not, or if a beep tone is heard before bridging the moisture strips, go to TEST #5: Moisture Sensor, page 18.

Exit Procedure

To exit User Interface/Control System Test, press the POWER button once or twice (depending on diagnostic procedure).

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FOR SERVICE TECHNICIAN’S USE ONLY

INSTALL DIAGNOSTICS

NOTE: The Service Diagnostic mode must be activated before entering Install Diagnostics; see procedure on page 3.

NOTE: If, at any point, the user presses the power button or opens the door during Install Diagnostics, the dryer exits to standby mode.

Active Fault Code Display in Install Diagnostics

If the display begins flashing while in Install Diagnostics, it is displaying an active fault code. Active fault codes are codes that are currently detected. Only one active fault code can be displayed at a time.

Entry Procedure

To enter Install Diagnostics, press and release the 2nd button used to activate the Service Diagnostic mode. All LEDs turn off and the START/Pause button begins to flash.

WATER-ONLY TEST: Press and hold the

START/Pause button for at least 5 seconds to run only the water system test.

PERFORM ALL TESTS: Press and release the

START/Pause button to run the tests indicated in the chart below.

Exit Procedure

When test is complete, press and hold the 1st button used to activate the Service Diagnostic mode for 5 seconds to exit Install Diagnostics. Opening and closing the door will also exit the test mode.

INSTALL DIAGNOSTICS

		STEP	TEST	TEST	DRYER FUNCTION	COMPONENT	NOTES
	1				Dryer starts L2 detection.	Motor On	Display shows “- - -” until voltage is
						Heater Off	available at UI.
				L
							• If Electric: Display of L2 level, in Hex
	2			1	L2 detection complete.	Motor On	(see Voltage Hex Code chart, page 21).
						Heater Off	• If Gas: Display of “9s” for gas since L2
				L
							does not exist.
				2
	3				Dryer starts L1 detection.	Motor On	Hex value (see chart, page 21) or “9s”
				& D	Airflow detection routine begins.	Heater On	(if gas dryer) continues to display on LED.
				E
					L1 detection complete.	Motor On	Once L1 is calculated, L1 + L2 is
	4			L T
				1 E	CCU calculates L1 + L2.	Heater On/Off	immediately calculated in the CCU.
				C			• Display of L1: in Hex value (see chart,
				t T
							page 21).
				o
							• Display of L2: in Hex value (see chart,
					Press the START button to cycle	Motor On
	5		A	L			page 21) or “9s” (if gas dryer).
					through L1, L2, and L1 + L2.	Heater On/Off
			I	2			• Display of L1 + L2: in Hex value
			R				(see chart, page 21). L1 + L2 =
			F				240 V AC ± 10%, or “9s” if gas dryer.
			L
						Motor On	The display will count down the final 15
	6		O		Airflow test near completion.
			W			Heater On/Off	seconds of the AirFlow detection routine.
							When the airflow routine is complete,
							the Dryness Level modifier LED will
						Motor Off	light up showing Airflow result: More
	7				Airflow detection complete.		LED (Good), Less LED (Bad), or no
						Heater Off
							LED (Invalid). In addition, the seven
							segment display will show airflow
							result (0=BAD, 1=GOOD, 2=INVALID).
			W		START/Pause button begins to flash.
	8				Press the START/Pause button to	Water Valve On	-s on display.
			A
					begin water system test.
			T
	9		E		Steam test running. Water turns on.	Water Valve On	Water is actuated for 30 seconds and
			R				then test completes.

* Dryer performance is optimized for 2-phase, 240 V AC service. If complaint is made regarding dryer performance and the L1 to L2 voltage is ~208 V AC, dryer may be connected to a 3-phase service with reduced wattage that will decrease dryer performance. Also check the Customer-Focused Dryness Level setting (see page 19).

DO NOT REMOVE OR DESTROY

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FOR SERVICE TECHNICIAN’S USE ONLY

SOFTWARE VERSION DISPLAY

NOTE: The Service Diagnostic mode must be activated before entering the Software Version Display mode. The Software Version Display mode will time out after 10 minutes of user inactivity and return to standby mode.

Entry Procedure

To enter Software Version Display, press and hold the 2nd button used to activate the Service Diagnostic mode for at least 5 seconds.

•CCU software revision code (C: major revision number, C: minor revision number, C: test revision number) will alternate on the display.

Exit Procedure

Press and hold the 1st button used to activate the Service Diagnostic mode for 5 seconds or press the POWER button to exit Software Version Display and return dryer to standby mode.

FAULT/ERROR CODES

Refer to fault/error code chart on page 7.

Fault/Error Code Display Method

Fault codes are displayed by alternately showing F# and E#. All fault codes have an F# and an E#. The F# indicates the suspect System/Category. The E# indicates the suspect Component system.

Up to four Fault/Error codes may be stored. When the oldest fault code is displayed, additional presses of the 3rd button will result in a triple beep, then display of the most recent fault code. If each press of the 3rd button results in a triple beep and the display shows “88”, no saved fault codes are present.

Advancing Through Saved Fault/ Error Codes

Procedure for advancing through saved fault codes:

Press and release g beep tone		g most recent fault
the 3rd button		code is displayed.
used to activate
Service Diagnostics
Repeat	g beep tone	g second most
		recent fault code
		is displayed.
Repeat	g beep tone	g third most
		recent fault code
		is displayed.
Repeat	g beep tone	g fourth most
		recent fault code
		is displayed.
Repeat	g triple beep	g back to the most
		recent fault code.

Clearing Fault Codes

To clear stored fault codes, enter Service Diagnostic mode. Then press and hold the 3rd button used to enter Service Diagnostic mode for at least 5 seconds. Once the stored fault codes are successfully erased, the seven segment display will show “88”.

EXITING SERVICE DIAGNOSTIC MODE

Use either of the two methods below to exit diagnostic mode.

•Pressing and holding the 1st button used to activate the Service Diagnostic mode for 5 seconds.

•Pressing the POWER button once or twice, depending on diagnostic procedure.

			CUSTOMER FAULT/ERROR CODES
	CODE	DESCRIPTION	EXPLANATION AND RECOMMENDED PROCEDURE
	PF	Power Failure	PF indicates that a power failure occurred while the dryer was running.
			Press START to continue the cycle, or press POWER to clear the display.
	L2	Low Line Voltage	L2 indicates low L2 voltage (less than 50 V) is detected at installation.
			• Refer to Fault/Error Code “F4E4”, page 7, for recommended procedure.

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			SERVICE FAULT/ERROR CODES
	CODE	DESCRIPTION	EXPLANATION AND RECOMMENDED PROCEDURE
	F1E1	Cycle Control Unit	Indicates a CCU problem.
			• Verify all connections to and from the CCU.
		(CCU) Problem
			• See TEST #1: CCU Power Check, page 9.
			.
	F2E1	User Interface (UI)	Indicates a stuck button (depressed for over 20 seconds) or UI
		Problem (stuck button) mismatch. This fault code will ONLY appear when in the service
			diagnostic mode. See TEST #6: Buttons and Indicators, page 19.
			.
	F2E2	User Interface	Appears if UI cannot read EEPROM software from UI.
			• Verify all connections between CCU and UI.
		Software Error 1
			• Replace the UI.
	F3E1	Exhaust Thermistor	Indicates that the exhaust thermistor is open. Temperature drops
		Open	below 18° F (> 50k ohms). See TEST #4a: Thermistors, page 16.
	F3E2	Exhaust Thermistor	Indicates that the exhaust thermistor has shorted. Temperature
		Shorted	above 250° F (< 500 ohms). See TEST #4a: Thermistors, page 16.
	F3E3	Inlet Thermistor	Indicates that the Inlet Thermistor is open. Temperature drops
		Open	below 18° F (> 245k ohms). See TEST #4a: Thermistors, page 16.
	F3E4	Inlet Thermistor	Indicates that the Inlet Thermistor is shorted. Temperature above
		Shorted	391° F (< 20 ohms). See TEST #4a: Thermistors, page 16.
	F3E5	Inlet and Exhaust	Indicates that the Inlet and Exhaust Thermistors are open.
		Thermistors Open	Will occur if the P14 connector is not plugged into the CCU.
		Moisture Sensor	Indicates the moisture sensor strip is open. This fault code will
	F3E6		only appear when in the service diagnostic mode. See. TEST #5:
		Open
			Moisture Sensor, page 18.
		Moisture Sensor	Indicates that the moisture sensor strip has shorted. This fault
	F3E7		code will ONLY appear when in the service diagnostic mode.
		Shorted
			See TEST #5: Moisture Sensor, page 17.
		Heater Relay or	Indicates no voltage detected at the heater relay. This fault code
	F4E1		will ONLY appear when in the service diagnostic mode.
		Connector Problem	• Unplug dryer or disconnect power and check that the wires are
			plugged into the heater element(s) and the relay(s) on the CCU.
			Indicates low air flow that may affect dryer performance.
	F4E3	Restricted Air Flow	• Confirm that airflow system is not blocked, check lint screen,
			exhaust duct, exhaust fan.
			.
			L2 indicates low L2 voltage (less than 50 V) is detected
			at installation.
			• Check to see if a household fuse has blown or a circuit breaker
			has tripped.
	F4E4	L2 Line Voltage	• Confirm the power cord is properly installed and plugged
		Error	into the power outlet.
			• Check the relay connections on the CCU.

• Gas Models Only: Check the P14 connection on the CCU.

(Harness loopback on Pins 4 & 5)

DO NOT REMOVE OR DESTROY

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FOR SERVICE TECHNICIAN’S USE ONLY

TROUBLESHOOTING GUIDE

PROBLEM	POSSIBLE CAUSE	CHECKS & TESTS
WILL NOT POWER UP	No power to dryer.	Check power at outlet, check circuit breaker,
- No operation		fuses, or junction box connections.
- No keypad response	Connection problem between AC plug and dryer.	See Test #2: Supply Connections, page 10.
- No LED's or display
	Connection problem between CCU and UI.	Check connections and harness continuity
		between CCU and UI.
	Power supplies not present at machine electronics.	See Test #1: CCU Power Check, page 9.
	User Interface problem.	See Test #6: Buttons & Indicators, page 19.
WILL NOT START CYCLE	Door not fully closed or striking the door latch.	Be sure the door is completely closed,
(No response when START/Pause		then press and hold the START button.
button is pressed.)
	Door Switch problem.	See Test #7: Door Switch, page 20.
	Drive Belt / Belt Switch problem.	See Test #3: Motor Circuit, page 12.
	Thermal Fuse / Motor problem.	See Test #3: Motor Circuit, page 12.
	User Interface problem.	See Test #6: Buttons & Indicators, page 19.
	CCU problem.	See Test #1: CCU Power Check, page 9.
WILL NOT SHUT OFF	Poor airflow.	Check lint screen and exhaust vent. Clean
WHEN EXPECTED		if necessary.
	Check the START/Pause button.	Perform UI Component Test under
		Component Activation.
	Moisture Sensor problem.	See Test #5: Moisture Sensor, page 18.
	Thermistor problem.	See Test #4a: Thermistors, page 16.
	User Interface problem.	See Test #6: Buttons & Indicators, page 19.
	CCU problem.	See Test #1: CCU Power Check, page 9.
CONSOLE WON’T ACCEPT	User selects invalid option.	Refer customer to “Use and Care Guide”.
SELECTIONS
	User Interface problem.	See Test #6: Buttons & Indicators, page 19.
DRUM WILL NOT SPIN	Drive Belt / Belt Switch problem.	See Test #3: Motor Circuit, page 12.
	Thermal Fuse (electric only).	See Test #4b: Thermal Fuse, page 17.
	Door switch problem.	See Test #7: Door Switch, page 20.
	Motor problem.	See Test #3: Motor Circuit, page 12.
	CCU problem.	See Test #1: CCU Power Check, page 9.
WILL NOT HEAT	Check installation.	Verify proper dryer installation.
	Check for L1 and L2.	Perform CCU L1 and L2 tests under Install
		Diagnostics.
	Heater system malfunction or open heater coil.	See Test #4: Heat System, page 13.
	CCU problem.	See Test #1: CCU Power Check, page 9.
HEATS IN AIR CYCLE	Heater coil shorted.	See Test #4: Heat System, page 13.
	Heater relay shorted.	See Test #4: Heat System, page 13.
	Heater system problem.	See Test #4: Heat System, page 13.
SHUTS OFF BEFORE CLOTHES	Dryness setting for auto cycles.	Increase drying times for one or more
ARE DRY		auto cycles.
	Lint screen full.	Clean if necessary. Refer customer
		to “Use and Care Guide”.
	Heater vent clogged.	Clean if necessary. Refer customer
		to “Use and Care Guide”.
	Moisture Sensor problem.	See Test #5: Moisture Sensor, page 18.
	Adjust Customer Focused Dryness Level.	See Test #5a: Adj. Cust. Focused
		Dryness Check, page 19.
WATER VALVE NOT DISPENSING	Steam cycle not selected.	Refer customer to “Use and Care Guide”.
( Water valve is activated intermittently	No water to valve.	Verify water supply is turned on.
during the steam cycle.)
	No water from valve.	See Test #9: Water Valve, page 20.

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TROUBLESHOOTING TESTS

IMPORTANT: The following procedures may require the use of needle probes

to measure voltage. Failure to use needle probes will damage the connectors.

TEST #1: CCU Power Check

This test checks for incoming and outgoing power to and from the Cycle Control Unit (CCU). This test assumes that proper voltage is present at the outlet.

1.Unplug dryer or disconnect power.

2.Check for appropriate line voltages at the outlet: 240V AC (electric 2-phase), 208V AC (electric 3-phase), or 120V AC (gas).

If line voltage is present, go to step 3.

If line voltage is not present, check for tripped circuit breaker or blown household fuse. If CB (circuit breaker) is not tripped, have customer check with qualified electrician.

3.Remove console to access the CCU and User Interface (UI).

4.Plug in dryer or reconnect power.

5. CCU AC – With voltmeter set to AC, connect black probe to CCU P8-3 (N) and red probe to P9-2 (L1). (See Figure 2.)

If 120V AC is present, go to step 6.

If 120V AC is not present, perform TEST #2: Supply Connections, page 10.

6. CCU +5V DC – Perform the following voltage checks inside header P2—DO NOT SHORT PINS TOGETHER. With voltmeter set to DC, connect black probe to CCU P2-3 (ground) and red probe to P2-1 (+5V DC).

If +5V DC is present, go to step 9.

If +5V DC is not present, go to step 7.

7. Unplug dryer or disconnect power. Unplug P14 from the CCU. Plug in dryer or reconnect power and repeat step 6.

If +5V DC returns, one of the thermistors has shorted. To diagnose thermistors, see TEST #4a, page 16.

If +5V DC is not present, go to step 8.

8. Unplug dryer or disconnect power. Reconnect P14 to the CCU and unplug P5 from the CCU. Plug in dryer or reconnect power and repeat step 6.

	P2 – +5 V DC			P5 – USER INTERFACE
	P2-1	+5V DC			P5-1 +5V DC
					P5-2 DATA IN
	P2-2
					P5-3 GND
	P2-3	5V GND
					P5-4 STROBE
	P8 – WATER VALVE/DOOR SWITCH				P5-5	DATA OUT
					P5-6	CLOCK
					P5-7	BUZZER
	P8-4 TAN	DOOR SWITCH			P5-8	+12V DC
			P14-3	R/W	OUTLET THERMISTOR
	P8-3 WHT NEUTRAL
	P8-2 G/Y	CHASSIS GND	P14-2	RED	INLET THERMISTOR
	P8-1 RED	WATER VALVE	P14-1	RED	INLET THERMISTOR

	Heater Relay #1			P9	Motor Relay
L1 – BLK (N.O.)	(Gas & Elect.)
Heater (E) – VLT (COM)	K2
Heater (G) – RED (COM)
Heater Relay #2		K1
(Elect. Only)
	K3
L1 – BLK (N.O.)
Heater (E) – VLT (COM)		P8
Figure 2 - CCU Connectors & Pinouts

P9 – MOTOR/L1

P9-2 BLK L1

P9-1 LT BLU MOTOR

P13 – MOISTURE SENSOR

P13-2	Y/R	MOISTURE SENSOR
P13-1	Y/R	MOISTURE SENSOR

P14 – THERMISTORS

P14-6		R/W	OUTLET THERMISTOR
P14-5		BLK	MODEL RTN (GAS MODEL)
P14-4		BLK	MODEL (GAS MODEL)
		P13	P5
			P2
			τ = pin-1

P14

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If +5V DC is still missing, replace the CCU.

If +5V DC returns, check harness and connections between the CCU and User Interface (UI). If acceptable, replace the UI.

9. CCU +12V DC – with voltmeter set to DC, connect black probe to CCU P5-3 (ground) and red probe to P5-8 (+12V DC).

If +12V DC is present, go to step 11.

If +12V DC is not present, go to step 10.

10. Unplug dryer or disconnect power. Unplug

P5 from the CCU. Plug in dryer or reconnect power and repeat step 9 by performing the voltage check inside header P5—DO NOT SHORT PINS TOGETHER.

If +12V DC is still missing, replace the CCU.

If +12V DC returns, check harness and connections between the CCU and User Interface (UI). If acceptable, replace the UI.

11.Unplug dryer or disconnect power.

12.Reassemble all parts and panels.

13.Perform steps under “Install Diagnostics”, page 5, to verify repair.

TEST #2: Supply Connections

This test assumes that proper voltage is present at the outlet, and for U.S. installations, a visual inspection indicates that the power cord is securely fastened to the terminal block (electric dryer) or wire harness connection (gas dryer).

ELECTRIC DRYER (U.S. Installations):

1.Unplug dryer or disconnect power.

2.Remove the cover plate from the back of the dryer. See Figure 3.

Cover Plate Remove Screw

Figure 3 - Remove the cover plate (electric).

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 4a.

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 4a.

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

retest dryer.

		Power Cord	Terminal Block
	N		L1
		Plug

COM

Figure 4a - Plug-to-terminal connections for electric dryer.

5.Access the machine electronics without disconnecting any wiring to the CCU.

6.With an ohmmeter, check for continuity between the L1 terminal of the plug (found in step 4) and P9-2 (black wire) on the CCU.

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 P8-3 (white wire) on the CCU.

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.Visually check that ALL connectors are fully inserted into the CCU.

9.Visually check that ALL connectors are fully inserted into the UI.

10.Reassemble all parts and panels.

11.Plug in dryer or reconnect power.

12.Perform steps under “Install Diagnostics”, page 5, to verify repair.

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FOR SERVICE TECHNICIAN’S USE ONLY

ELECTRIC DRYER (Canadian Installations):

1.Unplug dryer or disconnect power.

2.Remove the cover plate from the back of the dryer. See Figure 3, page 10.

3.Access the machine electronics without disconnecting any wiring to the CCU.

4.With an ohmmeter, check the continuity from L1 and N plug terminals of the power cord to the terminals for L1 and N on the CCU. See Figure 4b.

	Power Cord	CCU
	Plug
		P9
	N Neu		L1
		1
	L1

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<![endif]>O

	<![if ! IE]> <![endif]>XXXXXXXP/N X-XXXX CO IN MADE x-YDDDx Code Date	5
		Neu
		N
	<![if ! IE]> <![endif]>Rev
	COM	1
		P8

Figure 4b - Plug-to-terminal connections for electric dryer.

If continuity exists for both connections, go to step 6.

If an open circuit is found, check the integrity of the connections of the power cord to the harness in the dryer; harness to the CCU; and the integrity of the power cord itself.

5.If it is necessary to replace the power cord, remove the retaining clip that secures the cord to the back panel. Disconnect the cord from the main harness and the ground wire from the rear panel, then pull out the power cord.

6.Visually check that ALL connectors are fully inserted into the CCU.

7.Visually check that ALL connectors are fully inserted into the UI.

8.Reassemble all parts and panels.

9.Plug in dryer or reconnect power.

10.Perform steps under “Install Diagnostics”, page 5, to verify repair.

GAS DRYER (U.S. and Canadian Installations):

1.Unplug dryer or disconnect power.

2.Remove the cover plate from the back

of the dryer. See Figure 5.

Cover Plate

Remove

Screw

Figure 5 - Remove the cover plate (gas).

3. Check that the power cord is firmly connected to the dryer’s wire harness. See Figure 6.

Wire Harness

Power Cord

Figure 6 - Power cord-to-wire harness connection for gas dryer.

4.Access the machine electronics without disconnecting any wiring to the CCU.

5.With an ohmmeter, check for continuity between the neutral (N) terminal of the plug and P8-3 (white wire) on the CCU. The left-hand side of Figure 7 shows the position of the neutral terminal (N) on the power cord plug. Also see Figure 2, page 9.

N
Neu	COM	L1
L1
G		N
Masse		Neu
Power Cord		G
Plug		Masse

Figure 7 - Power cord terminals, gas dryer.

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FOR SERVICE TECHNICIAN’S USE ONLY

If there is continuity, go to step 6.

If there is no continuity, disconnect the white wire of the main harness from the power cord at the location illustrated in Figure 6. Test the continuity of the power cord neutral wire as illustrated in Figure 7. If an open circuit is found, replace the power cord. Otherwise, go to step 6.

6. In a similar way, check for continuity between the L1 terminal of the plug and P9-2 (black wire) on the CCU.

If there is continuity, go to step 8.

If there is no continuity, check the continuity of the power cord in a similar way to that illustrated in Figure 7, but for power cord’s L1 wire.

If an open circuit is found, replace the power cord. Otherwise, replace the main harness.

7.Visually check that ALL connectors are fully inserted into the CCU.

8.Visually check that ALL connectors are fully inserted into the UI.

9.Reassemble all parts and panels.

10.Plug in dryer or reconnect power.

11.Perform steps under “Install Diagnostics”, page 5, to verify repair.

TEST #3: Motor Circuit

This test will check the wiring to the motor and the motor itself. The following items are part of this motor system:

Part of Motor System	Electric	Gas
	Dryer	Dryer
Drum belt
Door switch
Harness/connection
Thermal fuse		no
Drive motor
Belt switch
Centrifugal switch
Machine control electronics

NOTE: Refer to Strip Circuit on page 22 to diagnose drive motor.

1.Unplug dryer or disconnect power.

2.Remove the back panel and check for loose, worn, or damaged drum belt—repair as necessary.

3.Remove console to access the CCU and User Interface (UI).

4.Door Switch problems can be uncovered by following procedure under TEST #7: Door Switch, page 20; however, if this was not done, the following can be performed without applying power to the dryer. Connect an ohmmeter across CCU P8-3 (neutral, white wire) and P8-4 (door, tan wire).

With the door properly closed, the ohmmeter should indicate a closed circuit (0–2 Ω).

If not, check harnesses and connections between CCU and door switch. If good, replace the door switch assembly.

5. Motor Circuit Check - Access the CCU and measure the resistance across P8-4 and P9-1.

If resistance across P8-4 and P9-1 is in the range of 1 to 6 Ω, the motor circuit is acceptable. Replace the CCU.

Otherwise, continue to step 6.

6. Check the wiring and components in the path between these measurement points by referring to the appropriate wiring diagram (gas or electric) on pages 24–25.

ELECTRIC DRYER ONLY: Check the thermal fuse. See TEST #4b: Thermal Fuse, page 17.

ALL DRYERS: Continue with step 7 below to test the remaining components in the motor circuit.

7. Check the drive motor and belt switch. Slowly remove the drum belt from the springloaded belt switch pulley, gently letting the belt switch pulley down. See Figure 8.

Belt Switch Drum

Pulley Belt

Figure 8 - Slowly remove drum belt.

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Lt. Blue Wires

(Back and 4 Position)

FOR SERVICE TECHNICIAN’S USE ONLY

8. Remove the white connector from the drive motor switch. See Figure 9.

Drive Motor Switch White

Connector

Figure 9 - Remove white connector.

9. Remove the bare copper wire terminal from pin 5 of black drive motor switch. See Figure 10.

	Drive Motor	Main Winding:
		Lt. Blue Wire in Back
	Switch
		and Bare Copper Wire
		(5 position)

Start Winding:

Lt. Blue Wire in Back and

Bare Copper Wire

(3 position)

Figure 10 - Main and start winding measure points.

10. Using Figure 10 and the Strip Circuit on page 22, check for the resistance values of the motor’s Main and Start winding coils as shown in the following table.

NOTE: Main and Start winding coils must be checked at the motor.

	Winding	Resistance	Contact Points
		in ohms	of Measurement
			Lt. blue wire in back at pin 4
	MAIN	1.4–2.6	and bare copper wire terminal
			removed from pin 5 of black
			drive motor switch
			Lt. blue wire in back at pin 4
	START	1.4–2.8	and bare copper wire terminal
			on pin 3 of black drive
			motor switch

If the resistance at the motor is correct, there is an open circuit between the motor and CCU. Go to step 11 to check for belt switch problem.

If the Start winding resistance is much greater or less than the values listed in the previous table, replace the motor.

11. Check the belt switch by measuring resistance between the two light blue wires, as shown in Figure 11, while pushing up the belt switch pulley.

Belt Switch

Tension Pulley

Belt Switch

Figure 11 - Checking the belt switch.

If the resistance reading goes from open to a few ohms as pulley arm closes the switch, belt switch is good. If not, replace the belt switch.

If belt switch is good and there is still an open circuit, check and repair the main wiring harness.

12.Reassemble all parts and panels.

13.Plug in dryer or reconnect power.

14.Perform steps under “Install Diagnostics”, page 5, to verify repair.

TEST #4: Heat System

This test is performed when one or more of the following situations occurs:

3Dryer does not heat

3Heat will not shut off

3Display flashes L2 (electric only)

This test checks the components making up the heating circuit. The following items are part of this system:

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FOR SERVICE TECHNICIAN’S USE ONLY

	Part of Heating System	Electric	Gas
		Dryer	Dryer
	Harness/connection
	Heater relays
	Thermal cut-off
	Thermal fuse	no
	High limit thermostat
	Heat element assemblies		no
	Gas valve assembly	no
	Centrifugal switch
	Outlet thermistor
	Inlet thermistor
	Machine control electronics
	Console electronics and housing
	assembly
	Gas supply	no

NOTE: On the gas dryer, the inlet thermistor is located at the top of the drum inlet vent. Refer to Strip Circuit on page 22 to diagnose heater system.

Dryer does not heat:

Display flashes L2 (electric only):

Locate the components using Figures 12a and 12b.

ELECTRIC DRYER ONLY:

3Quick Check: Perform steps under “Install Diagnostics”, page 5, to test for L1 and L2 line voltage.

•If L1 is present, the thermal cut-off and heater relay #1 are functional.

•If L2 is present, the centrifugal switch, high limit thermostat, and the side of the heater connected to heater relay #1 are functional.

1.Unplug dryer or disconnect power.

2.Remove console to access the CCU and User Interface (UI). Remove front panel and drum to access thermal components.

3.Check Heaters—on the CCU, use an ohmmeter to measure the resistance between the violet wire terminal on heater relay #1 and the violet wire terminal on heater relay #2.

If the resistance is ≤50 Ω, go to step 5.

If an open circuit is detected, go to step 4.

		Thermal Cut-Off
	Inlet
	Thermistor/
	High Limit	Outlet
	Thermostat
		Thermistor

Heater Element Thermal Fuse

Figure 12a - Thermal components, electric dryer, viewed from front.

High Limit
Thermostat	Thermal Cut-Off

	Outlet
Flame	Thermistor
Sensor

Thermal Fuse

Figure 12b - Thermal components, gas dryer, viewed from front.

4. Visually check the wire connections between each relay and their respective heaters. If the connections look good, check for continuity across each heater (violet wire to center red wire). Refer to Strip Circuit on page 22.

 Replace the heater if it is electrically open.

5. Check Thermal Cut-off—on the CCU, use an ohmmeter to measure continuity between P9-2 (L1) and the black wire terminal on heater relay #1. Then, measure continuity between P9-2 (L1) and the black terminal on heater relay #2.

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If there is continuity, go to step 7.

If an open circuit is detected, go to step 6.

6. Visually check the wire connections between each relay (black wire) and the thermal cut-off. If the connections look good, check for continuity across the thermal cut-off.

Replace the thermal cut-off if it is electrically open.

7. Check High Limit Thermostat—visually check the wire connections from the heaters and centrifugal switch to the high limit thermostat. If the connections look good, check for continuity across the high limit thermostat.

Replace the high limit thermostat if it is electrically open.

8. If no open circuit is detected, remove the

P14 connector from the CCU and measure the outlet thermistor resistance between P14-3 and P14-6 at the connector. Refer to “Outlet Thermistor Resistance” table on page 16 for temperatures and the associated values.

If the resistance corresponds to the temperature, the outlet thermistor is good. Go to step 9.

If the resistance does not agree with the table, replace the outlet thermistor.

9.If the preceding steps did not correct the problem and L1 and L2 were both detected, replace the CCU. If L2 was not detected, suspect the centrifugal switch before replacing the CCU.

10.Reassemble all parts and panels.

11.Plug in dryer or reconnect power.

12.Perform steps under “Install Diagnostics”, page 5, to verify repair.

GAS DRYER ONLY:

1.Verify the gas supply to the dryer is turned on.

2.Unplug dryer or disconnect power.

3.Perform TEST #4b: Thermal Fuse on page

17.If the thermal fuse is OK, go to step 4.

4.Perform TEST #4c: Thermal Cut-Off on page

17.If the thermal cut-off is OK, go to step 5.

5.Locate the high limit thermostat (see Figure 12b, page 14). Measure the continuity through it by connecting the meter probes to the black and red wire terminals.

If there is an open circuit, replace both the high limit thermostat and the thermal cut-off.

Otherwise, go to step 6.

6.Perform TEST #4d: Gas Valve on page

17.If the gas valve is OK, go to step 7.

7.If the preceding steps did not correct the problem, suspect the centrifugal switch before replacing the CCU.

8.Reassemble all parts and panels.

9.Plug in dryer or reconnect power.

10.Perform steps under “Install Diagnostics”, page 5, to verify repair.

Heat will not shut off:

ALL DRYERS:

1.Unplug dryer or disconnect power.

2.Remove console to access the CCU and User Interface (UI).

3.Remove connector P14 from the CCU and measure the resistance between P14-3 and P14-6 at the connector. Refer to “Outlet Thermistor Resistance” table on page 16 for temperatures and the associated values.

If the resistance corresponds to the temperature, the outlet thermistor is good.

If the thermistor resistance does not agree with the table, replace the outlet thermistor; if open, repair as necessary.

4.ELECTRIC DRYER ONLY: Check heater coil(s) for a short to ground (usually inside the heater box). Repair or replace if necessary.

5.Plug in dryer or reconnect power.

6.Run an Air Only Timed Dry cycle (no heat). Check heater relay output(s) on CCU. With a voltmeter set to AC, measure the voltage across the N.O. and COM terminals for heater relay #1. Repeat procedure with heater relay #2.

If voltage is present (~240V AC for electric, ~120V AC for gas), the relay is open and working normally.

If little or no voltage is present, the relay is closed and heater is activated. Replace the CCU.

7.Unplug dryer or disconnect power.

8.Reassemble all parts and panels.

9.Plug in dryer or reconnect power.

10.Perform steps under “Install Diagnostics”, page 5, to verify repair.

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FOR SERVICE TECHNICIAN’S USE ONLY

TEST #4a: Thermistors

NOTE: Refer to Strip Circuit on page 22 to diagnose outlet and inlet temperature thermistors.

Outlet (Exhaust) Thermistor

The CCU monitors the exhaust temperature using the outlet thermistor, and cycles the heater relay on and off to maintain the desired temperature. NOTE: Begin with an empty dryer and a clean lint screen.

1.Unplug dryer or disconnect power.

2.Remove console to access the CCU and User Interface (UI).

3.Remove connector P14 from the CCU and measure the resistance between P14-3 and P14-6 at the connector. The following table gives temperatures and the associated resistance values.

NOTE: All thermistor resistance measurements must be made while dryer is unplugged and connector removed from CCU.

OUTLET THERMISTOR RESISTANCE

	TEMP.	RES.	TEMP.	RES.
		RANGE		RANGE
	°F (°C)		°F (°C)
		k ohms		k ohms
	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 resistance is OK, the outlet thermistor is good. Proceed to step 4.

If the thermistor resistance does not agree with the table, replace the outlet thermistor.

4.Check P14-3 and P14-6 to dryer cabinet ground. If either pin indicates continuity

to ground (short), replace wiring harness; otherwise, proceed to step 5.

5.If the preceding steps did not correct the problem, replace the CCU.

Temperature Levels Incorrect – If no error code is displayed and the connections to the thermistor are good, check the exhaust temperature value at any or all of the temperature levels in question, using the TIMED DRY cycle.

1.Remove load from dryer and disconnect external vent.

2.Plug in dryer or reconnect power.

3.Run a TIMED DRY cycle of at least 5 minutes in duration. Select high, medium, low, or extra low.

4. Using a calibrated temperature probe, take a temperature measurement in the center of the exhaust outlet. The correct exhaust temperatures are as follows:

EXHAUST TEMPERATURES

	TEMPERATURE	HEAT TURNS OFF*		HEAT TURNS ON
	SETTING	°F (°C)		°F (°C)
	High	155° ± 5°	(68° ± 3°)	10–15° (6–8°)
	Medium	140° ± 5° (60° ± 3°)
				below the
	Low	125° ± 5°	(52° ± 3°)	heat turn off
	Extra Low	105° ± 5°	(41° ± 3°)	temperature

If the temperature is not reached within ~7 minutes, check voltage level and vent blockage, and then retest.

If the temperature probe does not agree with temperature setting, replace the outlet thermistor.

If the temperature probe confirms the temperature setting, retest at a different temperature setting.

5. If the preceding steps did not correct the problem, replace the CCU.

Inlet Thermistor

NOTE: On the electric dryer, the inlet thermistor is part of the high thermostat assembly (see Figure 12a, page 14). On the gas dryer, the inlet thermistor is located at the top of the drum inlet vent (see Figure 17, page 23).

The CCU monitors the inlet temperature using the inlet thermistor. The inlet thermistor (along with the outlet thermistor) is used to detect air flow, and assists in calculating load size.

1.Unplug dryer or disconnect power.

2.Remove console to access the CCU and User Interface (UI).

3.Remove connector P14 from the CCU and measure the resistance between P14-1 and P14-2 at the connector. The following tables (electric & gas) give temperatures and the associated resistance values.

NOTE: All thermistor resistance measurements must be made while dryer is unplugged and connector removed from CCU.

If the resistance is OK, the inlet thermistor is good. Proceed to step 4.

If the thermistor resistance does not agree with the table, replace the inlet thermistor.

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