Fast Track Troubleshooting
Model: WF438AAR/XAA
Publication # nwWF438 Revision Date 11/05/2012
Quick Test Mode
Note: This test erases all faults and memory:
To enter press Soil, Signal, & Power
simultaneously with the power off.
1. All LED’s light up and the washer beeps as it
enters the Quick Test Mode.
2. The unit displays the software version for a
second then clears the EEprom.
3. After the displaying the software version, LCD
will display Model information. If EEEE is displayed
the PCB ass’y is defective.
4. When the version is displayed, turn the Jog-Dial
so that the version disappears. Press the following
keys to test the various components
Press Temp Key to cycle through the Water Valves
circuit test (lock the door first) in this order: Pre-Wash,
Bleach, Cold Main, Hot, & Steam, then off.
Press Spin Key to test Door Lock/Unlock circuit
Press Soil Level Key to test Circulation/Drain Pump.
Press Signal Key to test the Water/Steam Heater.
When either Test or Spin is displayed on the LCD,
press Start/Pause key to conduct the motor test.
In Test mode, you can test the clockwise and counter-
clockwise movement of the motor. However, the water
level must satisfy the heater water level (24300) to en-
ter Test mode.
In Spin mode, you can test the motor at a high rpm.
Service Mode:
This mode allows more detailed operation tests and trouble-
shooting, to enter press Signal & Extra Rinse
simultaneously with the power on.
While in Service Mode the following tests can be performed:
Quick Spin Test = Delay Start & Silver Care: This acceler-
ates the drum motor from 0 to maximum RPM over a few
minutes. Note: Stay with the washer during this test, out of
balance detection is bypassed and the door may not lock.
Press the Start/Pause button during the test to hold its spinning
speed for 10 minutes before going back to Quick Spin Test
Mode.
Cycle Count = Press the Signal button to see how many times
the unit was used
Soft Ware # = Press the Soil button to see the software version
information
Fast Time Down = Press the Temp button to advance to the
next cycle
Fault Code Test = Press the Silver Care button to view the
stored fault codes – then turn Jog Dial to view error codes
(Push Start/Pause while the code is displayed to view the num-
ber of cycles since the error occurred)
Peripheral (Main PCB) input Tests
1. Select Extra Wash. Then turn the Jog-Dial so that the Extra
Rinse LED is turned on. Next, press the Start/Pause Key. The
Water Temperature will be displayed in Fahrenheit.
2. Select Extra Wash. Then turn the Jog-Dial so that the Extra
Spin LED is turned on. Next, press the Start/Pause Key. The
door status will be displayed (OP if open, CL if closed).
3. Select Extra Wash. Then turn the Jog-Dial so that the Delay
Start LED is turned on. Next, press the Start/Pause Key. The
door lock Switch status will be displayed (UL if unlocked, Lo if
locked).
4. Select Extra Wash. Then turn the Jog-Dial so that the Pre
Wash LED is turned on. Next, press the Start/Pause Key. The
Water Frequency will be displayed.
5. Select Extra Wash. Then turn the Jog-Dial so that My Cycle
LED is turned on. Next, press the Start/Pause Key. The AG Kit
status will be displayed after 3 seconds. (“ㅂE” if the AG kit is
abnormal. “—” if the AG Kit is working properly)
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.
EEPROM Clear Check
Power off, Press Delay Start, Signal and Power Key at
the same time. Good = Good Fail = FAiL
All memory will be cleared, including Fault Codes
This should be done when a new Main PCB is installed
Selecting Language
1. The “Select the Language”
message appears.
2. Turn the Jog Dial to select
language
3. Press Signal button to select
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