Test #8: Heater Element - Whirlpool WFW3090GW Service Manual

machine harness and repeat step 2.
11. With an ohmmeter, measure the resistance
across the two pump terminals. Resistance
should be 20–30 Ω.
If the reading is infinite (open), replace the
drain pump assembly.
WARNING
If the reading is correct, go to step 12.
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or
electrical shock.

TEST #8: Heater 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.
Figure 7 - Drain Pump Assembly
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
DO NOT REMOVE OR
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.
HEATING ELEMENT
HEATING ELEMENT
L1
IF-2
L1 - HEATER RELAY
For Service Technician Use Only
Drain pump
connector
DESTROY
ACU
J41-1
Figure 3 - Heating Element Strip Circuit
and resistance, test points for each pin are
6. Disconnect the wire connectors from the
accessible through the slots in the plastic
heating element. See Figure 8.
beneath each ACU connector.
7. Using an ohmmeter, measure the resistance
TEST #1: ACU Power Check
across the two heating element terminals.
This test checks for incoming and outgoing power
to and from Appliance Control Unit (ACU). This test
If the resistance is 7-30 Ω, the heating
assumes that proper voltage is present at the outlet.
8. If the preceding steps did not correct the heating element
element is good; replace the lower main
problem, replace the ACU.
1. Unplug washer or disconnect power.
harness.
¾ Unplug washer or disconnect power.
2. Gently lay washer on its right side
¾ Replace the ACU.
to access the ACU. If the resistance is open, replace the
¾ Reassemble all parts and panels.
3. Visually check that all connections to the
heating element.
¾ Perform the Service Test Cycle on pages 2-4 and 2-5 to
interference filter (IF) are securely connected.
verify repair.
See Figure 2, below.
Temperature Sensor
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.
Filter Output - Line (BU)
Filter Input - Power Cord Line (BK)
Heater Terminal
Figure 2 - Interference Filter (IF)
Figure 8 - Heater/Temperature Sensor Assembly
Heater Connector on ACU
J15-Inlet Valve
(1,2,3)
Drain Pump
(5,6)
J36-Motor
J41-Heater
J42-AC Input
J43-Door Lock/
Switch
Figure 2 - Heater Connector Location on ACU
Figure 3 - Appliance Control Unit (ACU)
7 - 30 ohms
H
HEATING ELEMENT
Whirlpool Compact Front Load Washer
COMPONENT TESTING
Assembly Removal Nut
Figure 1 - Heater Element
WV-DP
1
2
3
5
6
MOT
1
2
3
HE
1
2
IF
1
2
DSS
1
2
3
ACU
J41-2
N - HEATER RELAY
continuity of the
continuity chec
8. With a voltmete
voltage at the outp
See Figure 2.
If line voltage is
If line voltage is
interference filte
9. With a voltmete
line voltage to the A
of connector J42 A
If line voltage is
If line voltage is
harnesses and
filter and the AC
connector hous
terminals. Repa
Heater Terminal
DO N
N
IF-1
3-13
n
Filt
Filt