Service Manual

2-4
n
Whirlpool & Maytag Front-Load Dryers
DIAGNOSTICS & TROUBLESHOOTING
Abbreviaons
ACU: Appliance Control Unit
HMI: Human-Machine Interface
Diagnosc Guide
Before servicing, check the following:
n Make sure there is power at the wall outlet.
n Has a household fuse blown or circuit breaker tripped? Was
a regular fuse used? Inform customer that a me-delay
fuse is required.
n Is dryer vent properly installed and clear of lint or
obstrucons?
n All tests/checks should be made with a VOM (volt-
ohm-milliammeter) or DVM (digital-voltmeter) having a
sensivity of 20,000 Ω per volt DC or greater.
n Resistance checks must be made with dryer unplugged or
power disconnected.
n IMPORTANT: Avoid using large diameter probes when
checking harness connectors as the probes may damage
the connectors upon inseron.
n Check all harnesses and connecons before replacing
components. Look for connectors not fully seated, broken
or loose wires and terminals, pin inseron, or wires not
pressed into connectors far enough to engage metal barbs.
n A potenal cause of a control not funconing is corrosion
or contaminaon on connecons. Use an ohmmeter to
check for connuity across suspected connecons.
Service Diagnosc 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 specic troubleshoong tests.
Acvang Service Diagnosc Mode
1. Be sure the dryer is in standby mode (plugged in with all
indicators o).
2. Select any three (3) buons (except POWER and START)
and follow the steps below, using the same buons
(remember the buons and the order that the buons
were pressed):
Within 8 seconds,
• Press and Release the 1st selected buon,
• Press and Release the 2nd selected buon,
• Press and Release the 3rd selected buon;
• Repeat this 3 buon sequence 2 more mes.
3. If this test mode has been entered successfully, all
indicators on the console will be illuminated for 5 seconds
with “888” showing in the three-digit display and a tone
will sound. If there are no saved fault codes, all indicators
on the console will momentarily turn o, and then only
the seven-segment display will come back on and display
“888.”
NOTE: The Service Diagnosc mode will me out aer
10 minutes of user inacvity, or shut down if AC power is
removed from the dryer.
Unsuccessful Acvaon
If entry into diagnosc mode is unsuccessful, refer to the
following indicaons and acons:
Indicaon 1: None of the indicators or display turn on.
Acon: Select any cycle.
¾ If indicators come on, try to change the funcon for the
three buons used to acvate the diagnosc test mode. If
any buon is unable to change the funcon, something is
faulty with the buon, and it will not be possible to enter
the diagnosc mode using that buon. Replace the HMI
and housing assembly.
¾ If no indicators come on aer selecng the cycle, go to
TEST #1, ACU Power Check, page 3-8.
Indicaon 2: Console indicators begin ashing immediately.
Acon: If console indicators begin ashing on and o
immediately, replace the HMI.
Acvaon with Saved Fault Codes
If there is a saved fault code, it will be ashing in the display.
Review the Fault/Error Codes table on page 2-11 for the
recommended procedure. If there is no saved fault code,
“888” will be displayed.
• See “Acvang Service Diagnosc Mode” to acvate these funcons. Make sure all of step 3 is complete before acvaon.
SERVICE DIAGNOSTIC MENU
BUTTON PRESS FUNCTION BEHAVIOR
1st Buon
• Momentary press • Acvates Key Acvaon & Encoder Test
• Press and hold for 5 seconds • Exits Service Diagnoscs
2nd Buon
• Momentary press • Acvates Service Test Mode
• Press and hold for 5 seconds • Soware Version Display
3rd Buon
• Momentary press • Displays Next Error Code
• Press and hold for 5 seconds • Clears the Error Codes
Whirlpool & Maytag Console Diagnostics