Abbreviations; Icons; Diagnostic Guide; Service Diagnostic Mode/Service Test Cycle - Whirlpool 4.3 CU FT Service Manual

ABBREVIATIONS

ACU: Appliance Control Unit
UI: User Interface (PCB & housing)

ICONS

Water tank is filled with water or improperly positioned
Bottom filter is blocked by lint or improperly positioned
Door filter is blocked by link or improperly positioned

DIAGNOSTIC 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 time-delay
fuse is required.
n Make sure the dryer fan, lint screen, and secondary lint
filter are clear of lint and obstructions.
n 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.
n Resistance checks must be made with dryer unplugged or
power disconnected.
n Voltage checks must be made with all connectors attached
to the boards.
n IMPORTANT: Avoid using large diameter probes when
checking harness connectors as the probes may damage
the connectors upon insertion.
n 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.
n A potential cause of a control not functioning is corrosion
or contamination on connections. Use an ohmmeter to
check for continuity across suspected connections.
For Service Technician Use Only
DIAGNOSTICS & TROUBLESHOOTING
SERVICE DIAGNOSTIC MODE/
SERVICE TEST CYCLE
Allows service personnel to run the Service Test Cycle to verify
inputs to the dryer and functionality of the dryer control. You
may want to do a quick and overall checkup of the dryer with
this test before going to specific troubleshooting tests.
ACTIVATING SERVICE DIAGNOSTIC
MODE
IMPORTANT: Use Service Diagnostic Mode without laundry in
the dryer.
See the chart on page 5 for a summary of the steps in the
Service Test Cycle.
To enter Service Diagnostic Mode:
1. Be sure the dryer is in standby mode (plugged in with all
indicators off).
2. Open and close the dryer door. The door must be closed to
enter Service Diagnostic Mode.
3. Press and hold POWER until the dryer display turns on with
indicators scrolling from left to right. When the time remaining
display turns on, within a few seconds:
4. Press and hold DELAY START and OPTIONS until display
shows "FC" (the dryer will count down "3-2-1" before
displaying "FC"). Turn the cycle selector knob one click to the
right until display shows "SC" for Service Test Cycle. Rotating
the cycle selector knob will toggle the display between "SC"
(Service Test Cycle) and "FC" (Factory Test Cycle).
DO NOT SELECT OR RUN "FC" (FACTORY TEST CYCLE), AS IT
IS FOR FACTORY TEST PURPOSES ONLY AND REQUIRES THE
FACTORY ENVIRONMENT AND TEST EQUIPMENT. The START
LED will be flashing slowly. Immediately press START. The
control will beep and the display will show "S00".
Whirlpool Compact Heat Pump Dryer
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