Troubleshooting Guide - Whirlpool 4.3 CU FT Service Manual

DIAGNOSTICS & TROUBLESHOOTING

Troubleshooting Guide

NOTE: Always check for error codes first (pages 2-8 to 2-11)
Some tests will require accessing components. See Section 4, "Component Access" for component locations. For detailed testing
procedures, refer to Section 3, "Component Testing."
Problem
Dryer Operation
WILL NOT POWER UP No power to dryer.
• No operation
• No keypad
Connection problem between AC
response
plug and dryer.
• No LEDs or display
Connection problem between ACU
and UI.
Power supply not present at
machine electronics.
User Interface problem.
WILL NOT START Door filter or bottom lint filter not
present or not positioned properly
CYCLE
(filter icon showing in display).
(No response when
Start is pressed)
Door not fully closed/not striking
the door latch.
Door switch problem.
Drive belt problem.
Motor problem.
User Interface or communication
problem.
ACU problem.
WILL NOT SHUT OFF Poor airflow.
WHEN EXPECTED
Start/Pause button problem.
Moisture sensor problem.
NTC thermistor problem.
User Interface or communication
problem.
ACU problem.
CONSOLE WON'T User selected invalid option.
ACCEPT SELECTIONS
User Interface or communication
problem.
DRUM WILL NOT SPIN Drive belt problem.
Door switch problem.
Motor problem.
ACU problem.
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2-8 Whirlpool Compact Heat Pump Dryer
For Service Technician Use Only
Possible Causes Checks & Tests
Check power at outlet; check circuit breaker, fuses, or junction
box connections.
See TEST #2: Supply Connections, page 13.
Check connections and harness continuity between ACU and
UI.
See TEST #1: ACU Power Check, page 12.
See TEST #6: Buttons & Indicators, page 19.
Place door filter or bottom lint filter into position and make
sure it is fully inserted. See TEST #11: Heater Exchange Switch,
page 22.
Be sure the door is completely closed, then press and hold
START.
See TEST #7: Door Switch, page 20.
See TEST #3: Motor Circuit, page 14.
See TEST #3: Motor Circuit, page 14.
See TEST #6: Buttons & Indicators, page 19 and TEST #12:
Communication Between UI and ACU, page 22.
See TEST #1: ACU Power Check, page 12.
Check lint filters and fan. Clean if necessary.
See TEST #6: Buttons & Indicators, page 19.
See TEST #5: Moisture Sensor, page 18.
See TEST #4c: Thermistors, page 17.
See TEST #6: Buttons & Indicators, page 19 and TEST #12:
Communication Between UI and ACU, page 22.
See TEST #1: ACU Power Check, page 12.
Refer customer to Use & Care Guide.
See TEST #6: Buttons & Indicators, page 19 and TEST #12:
Communication Between UI and ACU, page 22.
See TEST #3: Motor Circuit, page 14.
See TEST #7: Door Switch, page 20.
See TEST #3: Motor Circuit, page 14.
See TEST #1: ACU Power Check, page 12.
Continued on following page . . .