Service Guide; Activating Service Mode; Important - Whirlpool WTW7120HC Manual De Instrucciones

SERVICE GUIDE

Before servicing, check the following:
Ƀ Make sure there is power at the wall outlet.
Ƀ Has a household fuse blown or circuit breaker tripped? Was a regular
fuse used? Inform customer that a time-delay fuse is required.
Ƀ Are both hot and cold water faucets open and water supply hoses
unobstructed?
Ƀ Make sure drain hose is not sealed into drain pipe, and that there is an
air gap for ventilation. Ensure drain height is between 39" (991 mm)
and 8' (2.4 m) above the floor.
Ƀ 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.
Ƀ Resistance checks must be made with washer unplugged or power
disconnected.
IMPORTANT: Avoid using large diameter probes when checking
harness connectors as the probes may damage the connectors upon
insertion.
Ƀ Check all harnesses and connections before replacing components.
Look for connectors not fully seated, broken or loose wires and
terminals, or wires not pressed into connectors far enough to engage
metal barbs.
Ƀ A potential cause of a control not
or contamination on connections. Use an ohmmeter to check for
continuity across suspected connections.
Ƀ To
properly check voltage:
1. Unplug appliance or disconnect power.
2. Attach voltage measurement probes to proper connectors.
3. Plug in appliance or reconnect power and verify voltage reading.
4. Unplug appliance or disconnect power after completing voltage
measurements.
DIAGNOSTIC LED – MAIN CONTROL (ACU)
A troubleshooting tool has been implemented onto the main control
board—a diagnostic LED.
LED Flashing – The Control is detecting correct incoming line voltage and
the processor is functioning.
LED OFF or ON – Control malfunction. Perform
(ACU), to verify main control functionality.
LED
Location
Figure 1 - Diagnostic LED
2
FOR SERVICE TECHNICIAN'S USE ONLY
washer functioning is corrosion
TEST #1: Main Control
SERVICE MODE
These tests allow factory or service personnel to test and verify all
inputs to the main control board. You may want to do a quick and
overall checkup of the washer with these tests before going to specific
troubleshooting tests.

ACTIVATING SERVICE MODE

1. Be sure the washer is in standby mode (plugged in with all
indicators off).
2. Select any three (3) buttons (except POWER) and follow the steps
below, using the same buttons:
Within 8 seconds,
dz Press and Release the 1st selected button.
dz Press and Release the 2nd selected button.
dz Press and Release the 3rd selected button.
dz Repeat this 3 button sequence 2 more times.
3. If Service Mode has been activated successfully, the text "This area
is for Service Technicians only" will be displayed on the LCD screen
and additional navigational instructions will cycle through.
4. Follow the instructions shown on the screen for navigation into
and within Service Mode. See also ENTRY PROCEDURE and
NAVIGATION sections on page 3.
NOTE: The Service Mode will time out after 5 - 10 minutes of user
inactivity, or shut down if AC power is removed from the washer.
Unsuccessful Activation
If entry into diagnostic mode is unsuccessful, refer to the following
indication and action:
Indication: The screen does not display the correct text.
Action: Retry the Activating Service Mode instructions with 3 different
buttons.
➢ If indicators come on, try to change the function for the three
buttons used to activate the diagnostic test mode. If any button is
unable to change the function, something is faulty with the button,
and it will not be possible to enter the diagnostic mode using that
button. Replace the user interface.
➢ If no indicators come on after selecting the cycle, go to
Main Control (ACU).
TEST #1:
DO NOT REMOVE OR DESTROY