Test Procedures - Whirlpool WFW94HEXR2 Manual

FOR SERVICE TECHNICIAN'S USE ONLY

TEST PROCEDURES

IMPORTANT: The following procedures
may require the use of needle probes
to measure voltage. Failure to use needle
probes will damage the connectors. To
ease the process of measuring voltage
and resistance, test points for each pin are
accessible through the slots in the plastic
beneath each CCU connector.
TEST #1: CCU Power Check
This test checks for incoming and outgoing power
to and from Central Control Unit (CCU). This test
assumes that proper voltage is present at the outlet.
1. Unplug washer or disconnect power.
2. Remove top panel to access the
machine electronics.
3. Visually check that all connections to the
interference filter (IF) are securely connected.
See Figure 3, below.
4. Visually check that all connections to the
CCU are fully inserted. See Figure 4, below.
5. If both visual checks pass, go to step 6.
Filter Output - Line (PK)
Filter Input - Power Cord Line (BK)
Figure 3 - Interference Filter (IF)
DI6-Detergent Dispenser Motor
FM3-Flow Meter (steam model)
DCS3-Door Closed Switch
Locking Tab
PS8-Pressure
Sensor/Switch
SET2-Temperature
Sensor
UI7-User Interface
MI3-MCU
Communications
Figure 4 - Central Control Unit (CCU)
DO NOT REMOVE OR
DL3-Door Lock Coil
DESTROY
6. Plug in washer or reconnect power.
7. With a voltmeter set to AC, check for line
voltage at the input of the interference filter.
See Figure 3.
 If line voltage is present, go to step 8.
 If line voltage is not present, verify the
continuity of the power cord. If it fails the
continuity check, replace the power cord.
8. With a voltmeter set to AC, check for line
voltage at the output of the interference filter.
See Figure 3.
 If line voltage is present, go to step 9.
 If line voltage is not present, replace the
interference filter.
9. With a voltmeter set to AC, check for input
line voltage to the CCU across pins 1 and 2 of
connector IF2. See Figure 4.
 If line voltage is present, go to step 10.
 If line voltage is not present, check
harnesses and connections between the
filter and the CCU. Repair as necessary.
Filter Output - Neutral (PK)
Filter Input - Power Cord Neutral (WT)
DP2-Drain Pump
RP2-Vent Fan
VCH7-Hot/Cold Valves
VFS2-Steam Valve (steam model)
RP2
VFS2
MS2-MCU Power
IF2-Interference
Filter
DLS2-Door
Lock Switch
HE2-Heater
Element
•
= pin-1
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