Component Testing; Test #1: Main Control - Whirlpool WETLV27HW0 Service Manual

DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.

Component Testing

TESTING WASHER COMPONENTS FROM THE
CONTROL
Before testing any of the components, perform the following
checks:
• The most common cause for mis-diagnosed control
failure is poor connections. Therefore, disconnecting,
inspecting and reconnecting wires will be necessary
throughout test procedures.
• All tests/checks should be made with a VOM or DVM
having a sensitivity of 20,000 ohms-per-volt DC, or
greater.
• Check all connections before replacing components,
looking for broken or loose wires, failed terminals, or
wires not pressed into connectors far enough.
• Voltage checks must be made with all connectors
attached to the boards.
• Resistance checks must be made with power cord
unplugged or power disconnected, and with wiring
harness or connectors disconnected from the control.
The testing procedures in this section may require the use
of needle probes to measure voltage. Failure to use needle
probes will damage the connectors.
For Service Technician Use Only

TEST #1: Main Control

This test checks for incoming and outgoing power to and from
main control. This test assumes that proper voltage is present
at the outlet.
1. Unplug washer/dryer or disconnect power.
2. Remove console to access main control.
3. Verify that ALL connectors are inserted all the way into the
main control.
4. Plug in washer/dryer or reconnect power.
5. With a voltmeter set to AC, connect black probe to J5-2
(Neutral) and red probe to J5-1 (L1).
¾ If 120 VAC is present, go to step 6.
¾ If 120 VAC is not present, check the AC power cord and
power harness for continuity. See Wiring Diagram on
page 3-4.
6. Is the "Diagnostic LED" ON or OFF? (See Figure 1 on page
3.6 for LED location.)
¾ ON: (+5 VDC present) continue to step 7.
¾ OFF: (+5 VDC missing) proceed to step 8.
7. With a voltmeter set to DC, connect black probe to J12-4
(Circuit Gnd) and red probe to J12-1 (+12 VDC).
¾ If +12 VDC is present, main control supplies are good.
¾ If +12 VDC is not present, go to step 8.
8. Check if shifter assembly is affecting the main control DC
supplies.
a. Unplug washer/dryer or disconnect power.
b. Remove connector J12 from main control.
c. Plug in washer/dryer or reconnect power.
d. Repeat steps 6 and 7. Perform the +12 VDC check
inside header J12 on the board – do not short pins
together.
¾ If one or more DC voltages are still missing, go to step
9.
¾ If the DC voltages return, check for short in harness
between main control and shifter assy.
¾ If harness and connections are good, replace shifter
assembly.
9. Main Control has malfunctioned.
a. Unplug washer/dryer or disconnect power.
b. Replace the main control.
c. Reassemble all parts and panels.
d. Plug in washer/dryer or reconnect power.
Calibrate washer and perform Automatic Test to verify repair.
Continue to next page for Main Control Board diagram
and Main Control Board connectors & pinouts
27" Stacked Laundry Center
TESTING – WASHER
3-5
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