Whirlpool WFC8090GX, Service Manual

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n
Whirlpool Smart All-In-One Washer & Dryer
COMPONENT TESTING
For Service Technician Use Only
TEST #8: Wash Heating Element
This test checks the wash heating element, wiring, and ACU.
1. Unplug washer/dryer or disconnect power.
2. Gently lay washer/dryer on its right side to access the
ACU. Remove AC shield and ACU cover.
3. Disconnect connector J9 from the ACU.
4. Using an ohmmeter, measure the resistance across pins 1
and 2 of connector J9 .
¾
If the resistance is 30–34 Ω , the heating element and
wiring are good; go to step 8.
¾
If the resistance is open, go to step 5.
5. Lay down washer/dryer and remove rear panel to access
the heating element.
6. Disconnect the wire connectors from the heating element.
See Figure 1.
7. Using an ohmmeter, measure the resistance across the
two heating element terminals.
¾
If the resistance is 30–34 Ω , the heating element is
good; replace the lower main harness.
¾
If the resistance is open, or very much out of range,
replace the heating element.
Figure 3 - Wash Heating Element Strip Circuit
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Failure to do so can result in death or
electrical shock.
Replace all parts and panels before operating.
Figure 1 - Heating/Temperature Sensor Assembly
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DES TROY
4. Gently lay washer on its right side
to access the ACU.
5. Visually check that the J15 connector
is inserted all the way into the ACU.
¾
If visual check passes, go to step 6.
¾
If connector is not inserted properly,
reconnect J15 and repeat step 2.
6. Remove connector J15 from the ACU.
With an ohmmeter, measure the resistance
across pins 5 and 6.
7. Resistance should be 20–30
Ω
when the pump is at room temperature.
¾
If the reading is infinite (open), go to step 8.
¾
If the reading is correct, go to step 12.
8. Remove the rear panel to access drain
pump. Verify that pump, pump filter, drain
hose, and air trap are free from obstructions.
9. Visually check the electrical connections
at the drain pump.
¾
If visual check passes, go to step 10.
¾
If connections are loose, reconnect the
electrical connections and repeat step 2.
10. With an ohmmeter, check harness for
continuity between the drain pump and ACU.
¾
If there is continuity, go to step 11.
¾
If there is no continuity, replace the lower
machine harness and repeat step 2.
11. With an ohmmeter, measure the resistance
across the two pump terminals. Resistance
should be 20–30
Ω
.
¾
If the reading is infinite (open), replace the
drain pump assembly.
¾
If the reading is correct, go to step 12.
Figure 7 - Drain Pump Assembly
12. If the preceding steps did not correct the
drain problem, replace the ACU.
¾
Unplug washer or disconnect power.
¾
Replace the ACU.
¾
Reassemble all parts and panels.
¾
Perform the Service Test Cycle
on page 5 to verify repair.
Water Temperature Controls
✓
Heating Element – Test #8
✓
Temperature Sensor – Test #9
TEST #8: Heating Element
This test checks the heating element, wiring,
and ACU.
1. Unplug washer or disconnect power.
2. Gently lay washer on its right side
to access the ACU.
3. Disconnect connector J41 from the ACU.
4. Using an ohmmeter, measure the resistance
across pins 1 and 2 of connector J41.
¾
If the resistance is 7-30
Ω
, the heating
element and wiring are good; go to step 8.
¾
If the resistance is open, go to step 5.
5. Remove back panel to access the heating
element.
6. Disconnect the wire connectors from the
heating element. See Figure 8.
7. Using an ohmmeter, measure the resistance
across the two heating element terminals.
¾
If the resistance is 7-30
Ω
, the heating
element is good; replace the lower main
harness.
¾
If the resistance is open, replace the
heating element.
Drain pump
connector
Temperature Sensor
Figure 8 - Heater/Temperature Sensor Assembly
Heater Terminal Heater Terminal
Assembly Removal Nut
WASH HEATING ELEMENT
Wash Heater Connector (J9) on ACU
Figure 2 - Heater Connector Location on ACU
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
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 ACU connector.
TEST #1: ACU Power Check
This test checks for incoming and outgoing power
to and from Appliance Control Unit (ACU). This test
assumes that proper voltage is present at the outlet.
1. Unplug washer/dryer or disconnect power.
2. Gently lay washer/dryer on its right side
to access the ACU.
3. Visually check that all connections
to the RFI filter are securely connected.
See Figure 2, below.
4. Visually check that all connections to the
ACU are fully inserted. See Figure 3, below.
5. If both visual checks pass, go to step 6.
6. Plug in washer/dryer or reconnect power.
7. With a voltmeter set to AC, check for line
voltage at the input of the RFI filter. See Figure 2.
¾
If line voltage is present, go to step 8.
¾
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 RFI filter. See Figure 2.
¾
If line voltage is present, go to step 9.
¾
If line voltage is not present, replace the
RFI filter.
9. With a voltmeter set to AC, check for input
line voltage to the ACU across pins 1 and 2
of connector J1. See Figure 3.
¾
If line voltage is present, go to step 10.
¾
If line voltage is not present, check
harnesses and connections between the
filter and the ACU. Visually inspect inside
connector housing for bent or damaged
terminals. Repair as necessary.
Figure 3 - Appliance Control Unit (ACU)
Figure 2 - RFI Filter
Filter Output - Line (BU)
Filter Input - Power Cord Line (BK) Filter Input - Power Cord Neutral (WT)
Filter Output - Neutral (BU)
J1 J9 J10
J3 J2
J6
J5
J16
J17
J7
J4
J22
J20
J14
J12
J11
J1 AC Input
J1-1 Blue Neutral In
J1-2 Line In
J2 Door Lock
J2-1 Red Line switched
by door lock
J2-2 Line switched
by main relay
J2-3 Door lock/unlock
J3 Door Lock to DD Motor
J3-1 White Line switched
by door lock
J3-2 Neutral
J4 Water Valves??
J4-1 White ????
J4-2 Open
J4-3 Spray valve
J4-4 Condens. valve
J4-5 Drain pump
J4-6 Cold valve
J5 Dosing Pumps
J5-1 White Detergent pump
J5-2 Mains relay out
J5-3 Mains relay out
J5-4 Softener pump
J6 Drain Pump
J6-1 Blue Drain pump,
relay out 1
J6-2 Mains relay out
J6-3 Drain pump,
relay out 2
J7 Blower Motor
J7-1 White Blower motor
J7-2 Mains relay out
J9 Wash Heater
J9-1 Red Wash heater N
J9-2 Wash heater L
J10 Dry Heater
J10-1 Black Neutral
J10-2 Line
J11 Bulk Dispenser Position
J11-1 White +5V DC out
J11-2 Drawer position
J12 Bulk Dispenser Levels
J12-1 White ADS feedback 1
(Low level detect,
detergent)
J12-2 Switched 5V
J12-3 ADS feedback 2
(Low level detect,
softener)
J12-4 Switched 5V
J12-5 Open
J14 Dry and Wash Temp Sensors
J14-1 White Dry NTC 1
J14-2 +5V
J14-3 Dry NTC 2
J14-4 Dry NTC 2
J14-5 Wash NTC
J14-6 +5V
J16 HMI Connector
J16-1 White ISO +5V
J16-2 OPTO WIN
J16-3 ISO GND
J16-4 ISO +12.7V
J17 MCU Connector
J17-1 White ISO +5V
J17-2 OPTO WIN
J17-3 ISO GND
J17-4 ISO +12.7V
J20 Water Sensor
J20-1 White GND
J20-2 Water Level In
J20-3 +5V
J22 Recirculating Pump
J22-1 Brown Mains relay out
J22-2 Recirc. pump
ACU
WASH HEATING ELEMENT
ACU
HEATING ELEMENT
L1
J1-2
L2
J1-1 J9-1 J9-2
L1 - HEATER RELAY L2 - HEATER RELAY
H
30 - 34 ohms
RFI-L RFI-N