Test #10B: Dispenser Metering Pumps - Whirlpool WFC8090GX Service Manual

COMPONENT TESTING
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.

TEST #10b: Dispenser Metering Pumps

Perform the following checks if the washer will not dispense
detergent or fabric softener.
1. Check water supply to washer. Check water hose
connections to and inside the washer.
2. Verify that bulk dispenser reservoir is not clogged with
detergent or fabric softener.
3. Remove bulk container and make sure the two filters are
in place at the base of the reservoir.
4. Check the relays and electrical connections to the dosing
pumps by performing the Service Diagnostic Mode Tests
on page 2-3. The following steps assume the detergent
and/or fabric softener pump did not turn on.
5. Unplug washer/dryer or disconnect power.
6. Remove bulk container. Remove bulk dispenser lid by
removing six screw cap covers and six screws.
7. Remove the top panel to access the dispenser system
8. Plug in washer/dryer or reconnect power.
9. Actuate each metering pump by performing the Service
Diagnostic Mode Tests on page 2-3.
Pump 1 (detergent pump)—detergent should dispense
from the side bottom port; touch the top of the pump and
feel for vibration/activation.
METERING PUMPS
ACU
L1
RFI-L
J1-2
n
3-16 Whirlpool Smart All-In-One Washer & Dryer
For Service Technician Use Only
DETERGENT PUMP
2
J5-2
FABRIC SOFTENER PUMP
1
J5-3
Figure 3 - Detergent & Fabric Softener Metering Pumps Strip Circuit
Pump 2 (fabric softener pump)—fabric softener should
dispense from the side top port; touch the top of the
pump and feel for vibration/activation.
¾ If pumps are actuating, but nothing is being dispensed,
remove the bulk dispenser assembly and check if hoses
are kinked or clogged.
¾ If pumps are not actuating, go to step 10.
10. With a voltmeter set to AC, attach the leads across the
pins of the suspect pump. Run the Service Diagnostic
Mode Tests and check for line voltage across the pins of
the pump. NOTE: Refer to the Service Diagnostic Mode
Tests on page 2-3 to determine when the detergent and
fabric softener pumps are actuated.
¾ If line voltage is present and pump still does not
activate, replace metering pump assembly.
¾ If line voltage is not present, replace the ACU.
11. Unplug washer/dryer or disconnect power.
12. Reassemble all parts and panels.
13. Perform the Service Diagnostic Mode Tests on page 2-3 to
verify repairs.
Bulk Dispensing System & Metering Pumps
Inlet Valve
Figures 1 & 2 - Bulk
Dispensing System &
Metering Pumps
1
P
J5-1
2
P
J5-4
Water Inlet Hose
Softener Pump
Reservoir
Detergent Pump
Pump Hose
Routing
ACU
J1-1
Bulk
L2
RFI-N