Whirlpool WFC8090GX, Service Manual

Page: 49 / 82

COMPONENT TESTING
Whirlpool Smart All-In-One Washer & Dryer
n
3-19
For Service Technician Use Only
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.
TEST #12a: Dry Heating Element
This test checks the dry 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 J10 from the ACU.
4. Using an ohmmeter, measure the resistance across pins 1
and 2 of connector J10 .
¾
If the resistance is 30–50 Ω , the heating element and
wiring are good; go to step 8.
¾
If the resistance is open, go to step 5.
5. Remove top panel to access the dry heating element.
6. Disconnect the wire connectors from the dry heating
element. See Figure 1.
7. Using an ohmmeter, measure the resistance across the
two heating element terminals.
¾
If the resistance is 30–50 Ω , the dry heating element is
good; go to step 8.
¾
If the resistance is far out of range or open, replace the
Heater Channel Assembly. NOTE : The heater element
cannot be replaced separately from the Heater Channel
Assembly.
Dry Heating
Element
Figure 1 - Dry Heating Element
8. Check thermal cutoffs.
¾
Check continuity of the thermal cutoff on the L1 side of
the harness.
¾ Check continuity of the thermal cutoff on the L2 side of
the harness.
¾
Each thermal cutoff has a “reset” button. If either
thermal cutoff is open, and cannot be reset, replace
the thermal cutoff (see Figure 2). NOTE : Apply thermal
grease/paste when replacing thermal cutoff.
Reset Button
Figure 2 - Resettable Thermal Cutoffs (TCO’s)
9. Check harness continuity between the J10 on the ACU and
the two thermal cutoffs.
¾
If the harness shows open, replace main harness.
¾ If harness continuity is good, go to step 10.
10. If the preceding steps did not correct the heating element
problem, replace the ACU.
¾ Unplug washer/dryer or disconnect power.
¾
Replace the ACU.
¾ Reassemble all parts and panels.
¾
Perform the Service Diagnostic Mode Tests on page 2-3
to verify repair.
Figure 3 - Dry Heating Element Strip Circuit
DRY HEATING ELEMENT
ACU
DRY HEATING ELEMENT
ACU
DRY HEATING ELEMENT
L1
J1-2
L2
J1-1 J10-1 J10-2
L1 - HEATER RELAY L2 - HEATER RELAY
H
30 - 50 ohms
TCO TCO
RFI-L RFI-N