Maytag MGD6500MBK User manual

TECHNICAL MANUAL
Maytag Dryer
W11576955A
Mul�media
Enhanced

2
FOR SERVICE TECHNICIAN’S USE ONLY
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.
IMPORTANT: Electrostatic Discharge (ESD) Sensitive Electronics
ESD problems are present everywhere. Most people begin to feel an ESD discharge at approximately 3000 V. It takes as
little as 10 V 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.
ɃUse an anti-static wrist strap. Connect wrist strap to green earth 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.
ɃBefore removing the part from its package, touch the anti-static bag to a green ground connection point or unpainted
metal in the appliance.
ɃAvoid touching electronic parts or terminal contacts; handle electronic control assembly by edges only.
ɃWhen repackaging main control assembly in anti-static bag, observe above instructions.
Voltage Measurement Safety Information
When performing live voltage measurements, you must
do the following:
ɃVerify the controls are in the off position so that the
appliance does not start when energized.
ɃAllow enough space to perform the voltage
measurements without obstructions.
ɃKeep other people a safe distance away from the
appliance to prevent potential injury.
ɃAlways use the proper testing equipment.
ɃAfter voltage measurements, always disconnect power
before servicing.
DANGER
Only authorized technicians should
perform diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can
result in death or electrical shock.

FOR SERVICE TECHNICIAN’S USE ONLY
3
General Information.............................................................................. 4-9
Dryer safety .............................................................................................. 5
Product specifications............................................................................... 6
Model number nomenclature..................................................................... 8
Model number and serial number label location ......................................... 8
Tech sheet location ................................................................................... 9
Diagnostic Guide............................................................................... 10-15
Diagnostic guide ..................................................................................... 11
Service diagnostic mode ......................................................................... 11
Button activation & encoder test .............................................................. 12
Service test mode ................................................................................... 12
Service test mode chart .......................................................................... 13
Software version display ......................................................................... 14
Service fault/error codes ......................................................................... 15
Troubleshooting ................................................................................ 16-30
Troubleshooting guide ............................................................................. 17
Troubleshooting tests .............................................................................. 18
Strip circuits ........................................................................................... 26
Wiring diagram........................................................................................ 27
Component locations .............................................................................. 30
Contents
Component Access ......................................................................... 31-44
Removing the door assembly .................................................................32
Removing the console/HMI and top panel...............................................32
Removing the appliance control unit (ACU).............................................33
Removing the door switch and front panel ..............................................35
Removing the drum and front panel bearings ..........................................36
Removing the belt, drum, and rear rollers ...............................................36
Removing the drive motor ......................................................................37
Removing the thermal fuse and exhaust thermistor .................................38
Removing the rear panel, high-limit thermostat, and
Thermal cutoff (TCO) (gas models only).................................................39
Removing the thermal cutoff (TCO), heater, and inlet thermistor
(Electric models only) ............................................................................40
Removing the flame sensor and gas burner assembly
(Gas models only)..................................................................................41
Removing the moisture sensor and metal oxide varistors (MOV) .............43
Removing the drum light assembly. ........................................................44

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FOR SERVICE TECHNICIAN’S USE ONLY
Section 1: GENERAL INFORMATION
This section provides general safety, parts, and information for the Maytag 7.0 cu ft Electric/Gas Dryer.
ɃDryer Safety
ɃProduct Specifications
ɃProduct Features
ɃModel Number Nomenclature
ɃModel Number and Serial Number Label Location
ɃTech Sheet Location.

FOR SERVICE TECHNICIAN’S USE ONLY
5
DRYER SAFETY
You can be killed or seriously injured if you don't immediately
You can be killed or seriously injured if you don't follow
All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury, and tell you what can
happen if the instructions are not followed.
Your safety and the safety of others are very important.
We have provided many important safety messages in this manual and on your appliance. Always read and obey all safety
messages.
This is the safety alert symbol.
This symbol alerts you to potential hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol and either the word “DANGER” or “WARNING.”
These words mean:
follow instructions.
instructions.
DANGER
WARNING
IMPORTANT SAFETY INSTRUCTIONS
WARNING: To reduce the risk of fire, electric shock, or injury to persons when using your appliance, follow basic precautions, including the following:
ɃRead all instructions before using the appliance.
ɃDo not dry articles that have been previously cleaned in, washed in,
soaked in, or spotted with gasoline, dry-cleaning solvents, or other
flammable or explosive substances, as they give off vapors that could
ignite or explode.
ɃDo not allow children to play on or in the appliance. Close supervision
of children is necessary when the appliance is used near children.
ɃBefore the appliance is removed from service or discarded, remove
the door to the drying compartment.
ɃDo not reach into the appliance if the drum is moving.
ɃDo not install or store this appliance where it will be exposed to the
weather.
ɃDo not tamper with controls.
ɃDo not repair or replace any part of the appliance or attempt any
servicing unless specifically recommended in the user maintenance
instructions or in published user-repair instructions that you
understand and have the skills to carryout.
ɃDo not use fabric softeners or products to eliminate static unless
recommended by the manufacturer of the fabric softener or product.
ɃDo not use heat to dry articles containing foam rubber or similarly
textured rubber-like materials.
ɃClean lint screen before or after each load.
ɃKeep area around the exhaust opening and adjacent surrounding areas
free from the accumulation of lint, dust, and dirt.
ɃThe interior of the appliance and exhaust duct should be cleaned
periodically by qualified service personnel.
ɃDo not place items exposed to cooking oils in your dryer. Items
contaminated with cooking oils may contribute to a chemical reaction
that could cause a load to catch fire. To reduce the risk of fire due
to contaminated loads, the final part of a tumble dryer cycle occurs
without heat (cool down period). Avoid stopping a tumble dryer before
the end of the drying cycle unless all items are quickly removed and
spread out so that the heat is dissipated.
ɃDo not use replacement parts that have not been recommended by the
manufacturer (e.g. parts made at home using a 3D printer).
ɃSee the Installation Instructions for grounding requirements and
installation.
SAVE THESE INSTRUCTIONS

6
FOR SERVICE TECHNICIAN’S USE ONLY
PRODUCT SPECIFICATIONS
Maytag 7.0 cu ft Electric/Gas Dryer
Dimensions
Capacity (cu ft) 7
Depth With Door Open 90 Degree (IN, inches) 5011/16
Depth (IN, inches) 283/8
Height to Top Of Cabinet (IN, inches) 367/8
Height (IN, inches) 4011/16
Maximum Height (IN, inches) 425/16
Minimum Height (IN, inches) 4011/16
Width (IN, inches) 29
Exterior
Door Style Side Swing
Reversible Door Yes
Controls
Automatic Temperature Controls Yes
Control Location Rear Console
Control Type Knob and Button
Electronic Display Type LED
Feedback-Status Indicators Sense, Wet, Cool, Done
End of Cycle Signal Yes
Features
Automatic Dry Control Yes
LP Convertible Yes
Moisture Sensor Yes
Sound Package No
Cycles
Number of Dryer Cycles 11
Selection of Drying Cycles Air Dry, Bulky Items, Delicates, Heavy Duty, Less Dry, More Dry, Normal,
Quick Dry, Timed Dry, Towels, Wrinkle Control
Options
Dryer Option Selections Cycle Signal, Temperature, Timed Dry, Wrinkle Prevent, Pet Pro
Number of Dryer Options 5
Temperature Settings
Number of Temperatures 4
Temperature Selection High, Low, Extra Low, Medium
Modifiers
Number of Dryness Levels 3
Selection of Drying Levels More, Less, Normal
Installation Considerations
Maximum Vent Length (ft) 64
Venting Direction Rear Only
Ventless NA

FOR SERVICE TECHNICIAN’S USE ONLY
7
Details
Drum Material Powder Coat
Heating Burner (BTU) (for Gas Dryer Only) 22,000
Interior Light Yes
Lint Screen Location Top
Motor Horsepower 1/3 HP
Description
Fuel Type Electric or Gas
Electrical
Ampere 15 or 30 A
Frequency (Hz) 60 Hz
Power Cord Included Yes for Gas models only
Voltage 120 V (Gas) or 240 V (Electric) Only

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FOR SERVICE TECHNICIAN’S USE ONLY
MODEL NUMBER NOMENCLATURE
Maytag®Model Number Nomenclature
MODEL NUMBER M E D 6500 M BK
Brand
M = Maytag
Fuel
E = Electric
G = Gas
Product Type
D = Dryer
W = Washer
Feature Set
6500 = Higher the number more features
are available
Year of Launch
M = 2022
Color Code
BK = Black Shadow
W = White
MODEL NUMBER AND SERIAL NUMBER LABEL LOCATION
Model Number and Serial Number
Label Location

FOR SERVICE TECHNICIAN’S USE ONLY
9
TECH SHEET LOCATION
Tech Sheet
Location

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FOR SERVICE TECHNICIAN’S USE ONLY
Section 2: DIAGNOSTIC GUIDE
This section provides Diagnostic guide for the Maytag 7.0 cu ft Electric/Gas Dryer.
ɃDiagnostic Guide
ɃService Diagnostic Mode
ɃButton Activation & Encoder Test
ɃService Test Mode
ɃService Test Mode Chart
ɃSoftware Version Display
ɃService Fault/Error Codes.

FOR SERVICE TECHNICIAN’S USE ONLY
11
DIAGNOSTIC GUIDE
Before servicing, check the following:
ɃMake sure there is power at the wall outlet.
ɃHas a household fuse blown or circuit breaker tripped? Was a regular
fuse used? Inform customer that a time-delay fuse is required.
ɃMake sure the dryer vent and lint screen are clear of lint and
obstructions.
ɃAll tests/checks should be made with a VOM (volt-ohm-milliammeter)
or DVM (digital-voltmeter) having a sensitivity of 20,000 Ω per VDC or
greater.
ɃResistance checks must be made with dryer unplugged or power
disconnected.
ɃIMPORTANT: Avoid using large diameter probes when checking harness
connectors as the probes may damage the connectors upon insertion.
ɃCheck 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.
ɃA potential cause of a control not functioning is corrosion or
contamination on connections. Use an ohmmeter to check for continuity
across suspected connections.
ɃTo properly check voltage, complete the following steps:
1. Unplug the dryer or disconnect power.
2. Attach voltage measurement equipment to proper connectors.
3. Plug in dryer or reconnect power and verify voltage reading.
4. Always unplug dryer or disconnect power after completing voltage
measurements.
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 LEDs off).
2. Select any three (3) buttons (except POWER & START) 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 this test mode has been entered successfully, all indicators on the HMI
will be illuminated for 1 second then will be turned OFF. After this, If there
are no saved fault codes, the STATUS indicators (Sense, Wet, Cool, and
Done) will blink two times and then all the indicators will be turned OFF.
NOTE: The Service Diagnostic mode will time out after 5 minutes of user
inactivity, or shutdown if the power supply is removed from the dryer.
SERVICE DIAGNOSTIC MENU TABLE
Button Press Function Behavior
1st Button - Momentary press - Enter Button Activation & Encoder test
- Press and hold for 5 seconds. - Exits Service Diagnostics
2nd Button - Momentary press - Activates Service Test Mode
- Press and hold for 5 seconds. - Software Version Display
3rd Button - Momentary press - Displays Next Error Code
- Press and hold for 5 seconds. - Clears the Error Codes
dzSee “Activating Service Diagnostic Mode” to activate these buttons.
Key 1
LED group 1 LED group 3
LED group 5
LED group 2
LED group 4
Key 2 Key 3 Key 4
Key 5/
START
Key 6 /
POWER
LED group 6
Status
Indicator

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FOR SERVICE TECHNICIAN’S USE ONLY
READING BINARY CODES
dzLED ON means 1.
dzLED OFF means 0.
dzThe status bar will blink 2x, to display a FxEx code.
dzThe first LEDs blinking will represent the F-number, and the
MUTE LED/LED 4 will be ON.
dzThe Second LEDs blinking will represent the E-number, and the
MUTE LED/LED4 will be OFF.
Frame
Number Status LED Mute LED
Fault/
Error code
Frame Timing
(second)
1 2 3 4 5
1 1 F F2 0.5
2 0.5
3 1 1 E E5 0.5
4 1
Repeat
Unsuccessful Activation
If entry into Diagnostic mode is unsuccessful, refer to the following
indications and actions:
Indication: None of the LEDs will turn on.
Action: Turn on the appliance by pressing the POWER button or rotating the knob and
select any cycle.
➢If LEDs turn on after pressing the POWER button or turning the knob, then try to
enter Service mode again: be sure to complete the three key entry method within
8 seconds. Alternatively, you can try using 3 different keys to enter (excluding
POWER and START). If these re-entry procedures fail to enter into Diagnostic
mode, there is likely a faulty button in the HMI. Replace the HMI.
➢If no LEDs come on after selecting the cycle, go to TEST #1, ACU Power Check,
page 18.
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 15for the recommended procedure. If there is no saved faul code.
All LEDs will turn OFF.
BUTTON ACTIVATION & ENCODER TEST
NOTE: The Service Diagnostic mode must be activated before entering the
Button Activation & Encoder Test; see procedure on page 11.
Entry Procedure
Press and release the 1st button used to activate Service Diagnostic mode.
The following test will be available:
DIAGNOSTIC: Button Activation & Encoder Test
The Encoder Test will be active immediately after successfully entering into
the Button Activation & Encoder Test:
➢When the Encoder Test starts, the WET LED will be turned ON.
➢Rotate the knob CW/CCW from the current position until a full knob
rotation is completed. Notice that the LEDs will turn ON/OFF while the
knob is rotated. After the Encoder Test is completed, all the LEDs will be
turned ON and the Button Activation test will be active. Pressing each
button will toggle ON/OFF its corresponding LEDs:
➢Temperature LEDs will toggle ON/OFF with TEMP button.
➢Time LEDs will toggle ON/OFF with TIME button.
➢Static Reduce (in some models only) and Wrinkle Shield LEDs will toggle
ON/OFF with OPTIONS button.
➢SENSE LED will toggle ON/OFF with MUTE button.
➢WET and COOL LEDs will toggle ON/OFF with START button.
➢DONE and MUTE LEDs will toggle ON/OFF with POWER button.
➢If LEDs do not toggle ON/OFF after pressing buttons and rotating the
cycle selector knob go to Test #6:HMI, page 24.
Exit Procedure
To exit Button Activation & Encoder test, press and hold the 1st used to activate
Service Diagnostic mode.
SERVICE TEST MODE
NOTE: The Service Diagnostic mode must be activated before entering Service
Test Mode; see procedure on page 11.
NOTE: If, at any point, the user presses the POWER button or opens the door
when not requested by the test sequence during Service test mode, the dryer
exits to standby mode.
NOTE: Door must be closed to perform test. Dryer must be cool before test
to run correctly.
Active Fault Code Display in Service Test Mode
If the display begins flashing while in Service test mode, 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 Service Test Mode, press and release the 2nd button used to
activate the Service Diagnostic mode then press and release the START
button. All LEDs will turn ON indicating that the Service Test Mode entry
was successful.
Perform All Tests: Run all tests indicated in the chart on page 13.
Exit Procedure
When the test is complete, press the POWER button to exit Service test mode
and return to Standby mode.
Sense Wet Cool Done
Example: F3E2
1. Cool and Done are ON, Mute LED is ON.
2. All are OFF
3. Cool is ON, Mute LED is OFF.
4. All are OFF
5. Back to step 1.
Value
0 0 0 0 0
0 0 0 1 1
0 0 1 0 2
0 0 1 1 3
0 1 0 0 4
0 1 0 1 5
0 1 1 0 6
0 1 1 1 7
1 0 0 0 8
1 0 0 1 9
LED group 5 LED group 6

FOR SERVICE TECHNICIAN’S USE ONLY
13
SERVICE TEST MODE CHART
Step# Action Component User Interface Response
1 User enters Service test mode through
Service Diagnostics by pressing
releasing the 2nd button used in entry
sequence
Door must be closed All LEDs are OFF and machine is waiting for START
button to be pressed.
2 Press and release START button to
begin the test
Motor ON
Heater /gas valve ON
Water valve On (Steam models
only)
-
3 All LEDs ON Motor ON
Heater /gas valve ON
Water valve On (Steam models
only)
1. All LEDs are ON.
4 Single Button Actuation test
dzPress and release TEMPERATURE
button.
Motor ON
Heater /gas valve ON
Water valve On (Steam models
only)
1. All indicators are ON at HMI and machine is waiting
for the TEMPERATURE button to be pressed.
2. After the TEMPERATURE button is pressed, all
indicators in the HMI are turned OFF.
5 Heater/gas valve test
1. Press and release TEMPERATURE
button.
2. After the TEMPERATURE button is
pressed, the heater or gas valve will
be turned OFF.
Motor ON
Heater /gas valve ON
Water valve On (Steam models
only)
1. The SENSING indicators is turnd ON at HMI and
machine is waiting for the TEMPERATURE button to
be pressed.
2. After the TEMPERATURE button is pressed the WET
indicators is turned ON.
6 Door test
1. Open the door.
2. After door is opened all loads will be
turned OFF. Drum light will be turned
ON.
Motor ON
Water valve ON (Steam
models only)
1. The SENSING and WET indicators are turned ON at
HMI and the machine is waiting for the user to open
the door.
2. After the door is opened, the COOL indicator is turned
ON.
7 Moisture strips
dzUser touches the front moisture
strips for 5 seconds.
Door open 1. The SENSING and WET and COOL indicators are
turned ON at HMI and the machine is waiting for the
user to touch the moisture strips.
8 Service test finishes - If all sequence is completed the HMI will turn ON Sense,
Wet , Cool, Done, 90, 60, 30,and 15 minutes
indicators and the end of cycle sound is played.
NOTE: Electric dryer performance is optimized for 2-phase, 240 VAC service. If complaint is made regarding electric dryer performance and the
L1 to L2 voltage is ~208 VAC, dryer may be connected to a 3-phase service with reduced wattage that will decrease dryer performance.
If a fault is detected at anytime in the test cycle, the service test cycle will stop and display the corresponding error code.

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FOR SERVICE TECHNICIAN’S USE ONLY
SOFTWARE VERSION DISPLAY
NOTE: The Software Version Display mode will time out after 5 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 5 seconds. Upon entry, the display
will automatically cycle through the following information:
Component Identi-
fier
Value display
ACU Application Firmware 1 XX:YY:ZZ
HMI Application Firmware 2 XX:YY:ZZ
Setting FIle 3 PN1:PN2:PN3:PN4:PN5:PN6:
PN7:PN8
ɃWhere XX.YY.ZZ corresponds to the 3 sets of 2 digit numbers that
describe a software version and PN1.PN2.PN3.PN4.PN5.PN6.PN7.PN8
is the 8 digit settings file part number.
ɃThe ACU, HMI and Settings file information will be displayed in the LEDs
(Sense, Wet, Cool, and Done) in binary format. Consider SENSE LED the
most significant bit.
ɃThe identifier value of the component information will be displayed in the
TEMPERATURE LEDs in binary format. Consider High LED from top as
the most significant bit.
(For example: Extra Low LED blinks, then the Identifier is 1. Extra Low
and Low LED blinks, then the Identifier is 3)
ɃLED ON = 1, LED OFF = 0.
Exit Procedure
Pressing the POWER button will exit Software Version Display and return dryer
to Standby mode.
FAULT/ERROR CODES
Refer to service fault/error codes on page 15.
Fault/Error Code Display Method
ɃFault codes are composed by a F# and an E#. The F# has two digits
and indicates the suspect System/Category. The E# has two digits and
indicates the suspect Component system.
ɃThe fault codes are displayed in binary format at the LEDs (SENSE, WET,
COOL, and DONE). When the LED is ON it represents a binary 1 and
when the LED is OFF it represents a binary 0.
ɃWhen the F# digits are displayed, the MUTE LED will be turned ON.
ɃWhen the E# digits are displayed, the MUTE LED will be turned OFF.
Up to five Fault/Error codes may be stored. Additional presses of the 3rd
button will cause the system to display the next fault code. If there are no
fault codes saved, the LEDs will blink two times for each 3rd button press.
Advancing Through Saved Fault/Error Codes
Procedure for advancing through saved fault codes:
Press and release 3rd button used
to activate service diagnostics
Most recent fault code is
displayed.
Repeat Second most recent fault code is
displayed.
Repeat Third most recent fault code is
displayed.
Repeat Fourth most recent fault code is
displayed.
Repeat Fifth most recent fault code is
displayed.
Repeat 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 5 seconds. Once
the stored fault codes are successfully erased, the LEDs will blink two times.
EXITING SERVICE DIAGNOSTIC MODE
Use below method to exit Diagnostic mode.
dzPressing the POWER button once.
Key 1
LED group 1 LED group 3
LED group 5
LED group 2
LED group 4
Key 2 Key 3 Key 4
Key 5/
START
Key 6 /
POWER
LED group 6
Status
Indicator

FOR SERVICE TECHNICIAN’S USE ONLY
15
SERVICE FAULT/ERROR CODES
CODE DESCRIPTION EXPLANATION AND RECOMMENDED PROCEDURE
F1E1 Motor or Heater Fault 1. Indicates the motor circuit is open or shorted.
See Test #3: Motor Circuit page 20.
2. Indicates the heat system is open or shorted. F1E1 fault for heat system will only
appear when in Service Diagnostic mode.
See Test #4: Heat System page 21.
F2E1 HMI stuck button Indicates a stuck button (depressed for over 20 seconds).
See Test #6: HMI, page 24.
F3E1 Exhaust Thermistor
Open/Shorted
Indicates that the exhaust thermistor is open or shorted. If the Open/Shorted temperature
drops below 18°F (-8°C) (> 50 kΩ), the exhaust thermistor is open. If the temperature
is above 250°F (121°C) (< 500 Ω), the exhaust thermistor has shorted. May occur if
the J14 connector is not plugged into the ACU. See TEST #4a: Thermistor, page 22.
F3E2 Moisture Sensor
Open/Shorted
Indicates the moisture sensor strip is open or shorted. This fault code will only appear
when in the Service Diagnostic mode. See TEST #5: Moisture Sensor, page 23.
F6E1 Communication Error: HMI and ACU Communication between the ACU and HMI has not been detected.
dzUnplug dryer or disconnect power.
dzCheck the harness continuity and connections between the ACU and HMI.
dzCheck AC and DC supplies. Test #1: ACU Power Check, page 18.
dzReplace the HMI.
dzReplace the ACU.

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FOR SERVICE TECHNICIAN’S USE ONLY
Section 3: TROUBLESHOOTING
This section provides Troubleshooting guide for the Maytag 7.0 cu ft Electric/Gas Dryer.
ɃTroubleshooting Guide
ɃTroubleshooting Tests
ɃStrip Circuits
ɃWiring Diagram
ɃComponent Locations.

FOR SERVICE TECHNICIAN’S USE ONLY
17
TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSE CHECKS & TESTS
WILL NOT POWER UP
- No operation
- No button response
- No LED’s or display
No power to dryer Check power at outlet, check circuit breaker, fuses, or junction box
connections.
Connection problem between AC plug and dryer See Test #2: Supply Connections, page 19.
Connection problem between ACU and HMI Check connections and harness continuity between ACU and HMI.
Power supplies not present at machine electronics Test #1: ACU Power Check, page 18.
HMI problem See Test #6: HMI, page 24.
WILL NOT START CYCLE
(No response when Start button
is pressed.)
Door not fully closed or striking the door latch Be sure the door is completely closed, then press and hold the START button.
Door Switch problem See Test #7: Door Switch, page 24.
Drive Belt problem See Test #3: Motor Circuit, page 20.
Thermal Fuse / Motor problem See Test #3: Motor Circuit, page 20.
HMI problem See Test #6: HMI, page 24.
ACU problem Test #1: ACU Power Check, page 18.
WILL NOT SHUT OFF
WHEN EXPECTED
Poor airflow Check lint screen and exhaust vent. Clean if necessary.
Check the Start/Pause button Perform button Activation & Encoder Test.
Moisture Sensor problem See Test #5: Moisture Sensor, page 23.
Thermistor problem See Test #4a: Thermistor, page 22.
HMI problem See Test #6: HMI, page 24.
ACU problem Test #1: ACU Power Check, page 18.
CONSOLE WON’T ACCEPT
SELECTIONS
User selected invalid option Refer customer to “Use and Care Guide.”
HMI problem See Test #6: HMI, page 24.
DRUM WILL NOT SPIN Drive Belt problem See Test #3: Motor Circuit, page 20.
Thermal Fuse See Test #4b: Thermal Fuse, page 23.
Door switch problem See Test #7: Door Switch, page 24.
Motor problem See Test #3: Motor Circuit, page 20.
ACU problem Test #1: ACU Power Check, page 18.
WILL NOT HEAT Check installation Verify proper dryer installation.
Check for L1 and L2 See Test#2: Supply Connections, page 19.
Heater system malfunction or open heater coil See Test #4: Heat System, page 21.
ACU problem Test #1: ACU Power Check, page 18.
HEATS IN AIR CYCLE Heater coil shorted See Test #4: Heat System, page 21.
Heater relay shorted See Test #4: Heat System, page 21.
Heater system problem See Test #4: Heat System, page 21.
SHUTS OFF BEFORE CLOTHES
ARE DRY
Dry Cycle selection Select More Dry cycle to increase dryness level in the Auto cycle. Increase
Temperature and Time for timed cycles.
Lint screen full Clean if necessary. Refer customer to “Use and Care Guide.”
Dryer vent clogged Clean if necessary. Refer customer to “Use and Care Guide.”
Moisture Sensor problem See Test #5: Moisture Sensor, page 23.
WATER VALVE NOT DISPENSING
(ON SOME MODELS)
(Water valve is activated intermit-
tently during the steam cycle.)
Steam cycle not selected Refer customer to “Use and Care Guide.”
No water to valve Verify water supply is turned on.
No water from valve or residue buildup on water
nozzle opening
See Test #8: Water Valve, page 24.
WATER LEAKING FROM DRYER
(ON SOME MODELS)
(Too much water being dispensed
during steam cycles)
Relay or water valve stuck See Test #8: Water Valve, page 24.

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FOR SERVICE TECHNICIAN’S USE ONLY
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: ACU Power Check
This test is used to determine if power is present at the machine control
electronics. This test assumes that proper voltage is present at the outlet.
1. Verify that the green LED on the ACU is lit and blinking when the dryer is
turned on.
2. Unplug dryer or disconnect power.
3. Check for appropriate line voltage at the outlet: 240 VAC
(electric 2-phase), 208 VAC(electric 3-phase), or 120 VAC (gas).
➢If line voltage is present, go to step 4.
➢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.
4. Remove console to access the machine electronics.
5. ACU VAC – With voltmeter set to AC, connect black probe to ACU
J7-4 (N) and red probe to J7-3 (L1). (See Figure 1.) Plug in dryer or
reconnect power.
➢If 120 VAC is present, unplug dryer or disconnect power and go to
step 6.
➢If 120 VAC is not present, unplug dryer or disconnect power and perform
TEST #2: Supply Connections, page 19.
6. ACU +5 VDC – With voltmeter set to DC, unplug connector J2 from the
ACU and connect black probe to ACU J2-4 (ground) and red probe to
J2-2 (+5 VDC). Plug in dryer or reconnect power.
➢If +5 VDC is present, unplug dryer or disconnect power and go to
step 9.
➢If +5 VDC is not present, go to step 7.
7. Unplug dryer or disconnect power. Unplug J4 from the ACU. Plug in
dryer or reconnect power and repeat step 6.
➢If +5 VDC returns, the thermistor has shorted. To diagnose
thermistor,see TEST #4a, page 22.
➢If +5 VDC is not present, go to step 8.
8. Unplug dryer or disconnect power. Reconnect J4 to the ACU and unplug
J2 from the ACU. Plug in dryer or reconnect power and repeat step 6.
Perform voltage check inside header J2 on ACU, between
pins 2 & 4—DO NOT SHORT PINS TOGETHER.
➢If +5 VDC is still missing, unplug dryer or disconnect power and replace
the ACU.
➢If +5 VDC returns, unplug dryer or disconnect power and check
harnesses and connections between the ACU and HMI. If acceptable,
replace the HMI.
9. ACU +12 VDC – with voltmeter set to DC, connect black probe to
ACU J2-4 (ground) and red probe to J2-1 (+12 VDC). Plug in dryer or
reconnect power.
➢If +12 VDC is present, go to step 11.
➢If +12 VDC is not present, go to step 10.
10. Unplug dryer or disconnect power. Unplug connector J2 from the ACU.
Perform voltage check inside heater J2 on ACU, between pins 1 & 4 -
DO NOT SHORT PINS TOGETHER.
➢If +12.7 VDC is still missing, unplug dryer or disconnect power and
replace the ACU.
➢If +12.7 VDC returns, unplug dryer or disconnect power and check
harnesses and connections between the ACU and HMI. If acceptable,
replace the HMI.
11. Unplug dryer or disconnect power.
12. Reassemble all parts and panels.
13. Perform steps under “Service Test Mode”, page 12, to verify repair.
and +12.7 VDC)
CDV5+(SUBNIW–2J
J2-1 RD +12.7 VDC
J2-2 NC +5 VDC
J2-3 YL DATA
J2-4 BK GND
J2-5 NC
J13 – MOISTURE SENSOR
J13-1 BK MOISTURE SENSOR
J13-2 RD MOISTURE SENSOR
J2
21 34 5
J4 – THERMISTORS
OPEN
J4-2
J4-1 RD/WH
OUTLET THERMISTOR
J4-3
J4-4 OPEN
J13
12
Heater/Gas Valve - VT
Heater/Gas Valve Relay
(Gas & Electric)
L1-BK
J13
J2
J4
J7
K6
Steam Valve
Relay
Motor Relay
Label
= Pin 1
K3
K2
J4
12 3 4 RD/WH
NC
NC
OUTLET THERMISTOR
J7-4 WH NEUTRAL
J7-5 TN DOOR SWITCH
J7-6 YL MYST VALVE
(STEAM MODELS ONLY)
J7 – DOOR SWITCH/LOADS/L1
J7-2 NC
J7-3 BK L1
J7
J7-1 LB MOTOR
4 1
5 2
6 3
Figure 1 - ACU Connectors and Pinouts

FOR SERVICE TECHNICIAN’S USE ONLY
19
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 top center portion of the back of the
dryer. See figure 2.
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 3a.
➢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 3a.
➢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.
5. Access the machine electronics without disconnecting any wiring to the
ACU.
6. With an ohmmeter, check for continuity between the L1 terminal of the
plug (found in step 4) and J7-3 (black wire) on the ACU.
➢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
J7-4 (white wire) on the ACU.
➢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. With an Ohmmeter, check which terminal of the plug is connected to the
right-most contact on the terminal block and make a note of it. This will
be L2 (Red wire) in the wiring diagram. See figure 3b.
➢When this is found, go to step 9.
➢If neither of the plug terminals have continuity with the right-most contact
of the terminal block, replace the power cord and retest dryer.
9. Check the wiring and continuity from the L2 terminal of the terminal block
and the 2M terminal in the white connector from the Motor, see figure 7
on page 20. Also, locate these measurement points by referring to the
appropriate wiring diagram (Electric) on page 28.
➢If there is continuity, go to step 10.
➢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.
10. Visually check that ALL connectors are fully inserted into the ACU.
11. Visually check that ALL connectors are fully inserted into the HMI.
12. Reassemble all parts and panels.
13. Plug in dryer or reconnect power.
14. Perform steps under “Service Test Mode”, page 12, to verify repair.
ELECTRIC DRYER (Canadian Installations):
1. Unplug dryer or disconnect power.
2. Remove the cover plate from the top center portion of the back of the
dryer. See figure 2.
3. Access the machine electronics without disconnecting any wiring to the
ACU.
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 ACU. See figure 3c.
➢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 ACU; 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 ACU.
7. Visually check that ALL connectors are fully inserted into the HMI.
8. Reassemble all parts and panels.
9. Plug in dryer or reconnect power.
10. Perform steps under “Service Test Mode”, page 12, to verify repair.
Cover Plate
Remove screw
Figure 2 - Remove the cover plate.
COM
N
L1
Power Cord
Plug
Terminal Block
Figure 3a - Plug-to-terminal connections for electric dryer.
COM
N
L2
Power Cord
Plug
Figure 3b - Plug-to-terminal connections for electric dryer.
Figure 3c - Plug-to-terminal connections
for electric dryer.
ACU
L1
J7
CO M
N
N
Neu
Power Cord plug
Neu
ACU
L1

20
FOR SERVICE TECHNICIAN’S USE ONLY
GAS DRYER (U.S. and Canadian Installations):
1. Unplug dryer or disconnect power.
2. Remove the cover plate from the top center portion of the back of the
dryer. See figure 2.
3. Check that the power cord is firmly connected to the dryer’s wire
harness. See figure 4.
4. Access the machine electronics without disconnecting any wiring to the
ACU.
5. With an ohmmeter, check for continuity between the neutral (N) terminal
of the plug and J7-4 (white wire) on the ACU. The left-hand side of
figure 6 shows the position of the neutral terminal (N) on the power cord
plug. Also see figure 1, page 18.
➢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 4. Test the
continuity of the power cord neutral wire as illustrated in figure 5. 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 J7-3 (black wire) on the ACU.
➢If there is continuity, go to step 7.
➢If there is no continuity, check the continuity of the power cord in a
similar way to that illustrated in figure 6, 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 ACU.
8. Visually check that ALL connectors are fully inserted into the HMI.
9. Reassemble all parts and panels.
10. Plug in dryer or reconnect power.
11. Perform steps under “Service Test Mode”, page 12, 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 Dryer Gas Dryer
Drum belt 3 3
Door switch 33
Harness/connection 33
Thermal fuse 33
Drive motor 33
Centrifugal switch 33
NOTE: Refer to strip circuit on page 26 to diagnose drive motor.
1. Unplug dryer or disconnect power.
2. Remove console to access the machine electronics.
3. Check for loose, worn, or damaged drum belt—repair as necessary.
4. Door Switch problems can be uncovered by following procedure under
TEST #7: Door Switch, page 24; however, if this was not done, the
following can be performed without applying power to the dryer. Connect
an ohmmeter across ACU J7-3 (L1, black) and J7-5 (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 ACU and door switch.
If good, replace the door switch assembly.
5. Motor Circuit Check - Access the ACU and measure the resistance
across J7-1 and J7-5.
➢If resistance across J7-1 and J7-5 is inthe range of 1 to 6 Ω, the motor
circuit is acceptable. Replace the ACU.
➢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 27 or 28 or 29.
NOTE: To access motor system components, remove the front panel.
Check the thermal fuse. See TEST #4b: Thermal Fuse, page 23.
ALL DRYERS: Continue with step 7 below to test the remaining components
in the motor circuit.
7. Check the drive motor. Slowly remove the drum belt from the spring-
loaded pulley, gently letting the pulley down. See figure 6.
8. Remove the white connector from the drive motor switch. See figure 7.
Power Cord
Wire Harness
Figure 4 - Power cord-to-wire harness
connection for gas dryer.
COM
Neu
G
L1
L1
N
Neu
N
G
Power Cord
Plug
Masse
Masse
Figure 5 - Power cord terminals, gas dryer. Pulley
Belt
Figure 6 - Slowly remove drum belt.
Connector
Figure 7 - Remove connector.
Part of Motor System Electric Dryer Gas Dryer
Machine control
electronics
33
Motor Internal
Thermal Protector
33