Test#12: Bulk Dispense Pump And Relay Expansion Board; Relay Expansion Board / Connectors & Pinouts - Whirlpool WTW9500E SERIES Service Manual

TESTING COMPONENT
WARNING
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 #12: Bulk Dispense Pump and
Relay Expansion Board (on some
models)
This test is performed if the bulk dispense feature is not
dispensing detergent. This test will check the function,
the electrical connections, the hose connections, and the
resistance of the bulk dispense pump.
Enter Service Diagnostic Mode shown on page 2-2. Retrieve
any fault/error codes. If the displayed fault/error code is F3E4,
there is likely a connection issue between the main control (J7,
see Figure 1 page 3-5) and the Rex board (J3, see Figure 1, on
this page). Clear the fault/error codes.
1. Once the fault/error codes are cleared, verify that the
bulk dispense container in the bulk dispense drawer is
filled with detergent before proceeding. Enter Service
Test Mode described on page 2-3. Follow the Service Test
Mode procedure to activate the bulk dispense pump.
After a minimum of 2 minutes, detergent should start to
trickle, then drip every few seconds through the detergent
dispenser on the front left corner as shown in Figure 2,
page 3-19. NOTE: The liquid will trickle in small amounts
into the detergent dispenser. The following steps assume
no detergent flowed after a minimum of 2 minutes while
the bulk dispense pump was activated.
2. Unplug washer or disconnect power.
3. Remove console cover to access the main control and Rex
board.
4. Verify that the main control connector J7 for the Rex
board is securely connected to the main control (see
Figure 1, page 3-5).
¾ If the harness and connections are good, go to step 5.
¾ If not, repair or replace as needed, check the other
connections per steps 5 and 6, and go to step 10.
5. Verify that the Rex board connectors J1, J2, and J3 are
securely connected to the Rex board (see Figure 1 on this
page).
¾ If the harness and connections are good, go to step 6.
¾ If not, repair or replace as needed, check the other
connections per step 6, and go to step 10.
3-18 Whirlpool & Maytag Direct Drive Top Load Washer
n
For Service Technician Use Only
4. Verify that the main control connector J7
for the Rex board is securely connected to the
main control (see Figure 2, page 14).
If the harness and connections are good,
go to step 5.
If not, repair or replace as needed, check
the other connections per steps 5 and 6,
and go to step 10.
5. Verify that the Rex board connectors J1,
J2, and J3 are securely connected to the Rex
board (see Figure 6).
If the harness and connections are good,
go to step 6.
If not, repair or replace as needed, check
the other connections per step 6, and go
to step 10.
6. Verify that the bulk dispense extension
harness is connected to the bulk dispense
pump connector that is protruding through
the top (see Figure 9, page 24).
If the harness and connections are good,
go to step 7.
If not, repair or replace as needed and go
to step 10.
7. Unplug the bulk dispense extension
harness from the bulk dispense pump
connector that is protruding through the top
(see Figure 9, page 24). Connect a multimeter
to the bulk dispense pump connector
terminals and set it to read the resistance.
Rex Board
Connectors
and Pinouts
(Figure 6)
J3 Main
Control
Board
6. Verify that the bulk dispense extension harness is
connected to the bulk dispense pump connector that is
protruding through the top (see Figure 3, page 3-19).
¾ If the harness and connections are good, go to step 7.
¾ If not, repair or replace as needed and go to step 10.
7. Unplug the bulk dispense extension harness from the bulk
dispense pump connector that is protruding through the
top (see Figure 3, page 3-19). Connect a multimeter to the
bulk dispense pump connector terminals and set it to read
the resistance. The bulk dispense pump resistance should
be between 1485 ohms and 1815 ohms.
¾ If the resistance value is between 1485 ohms and 1815
ohms, proceed to step 9.
¾ If the resistance value is out of range, proceed to step 8.
FOR SERVICE TECHNICIAN'S USE ONLY
Access the underside of the top as shown in figure 2, page
3-19. IMPORTANT: Remove bulk dispense drawer before
accessing underside of top.
8. Replace the bulk dispense pump. Inspect the hoses that
are connecting the bulk dispense pump to the detergent
drawer and the detergent dispenser for cracks, holes, and
obstructions. Replace any damaged or obstructed hoses
and proceed to step 10.
9. Replace the Rex board and proceed to step 10.
10. Reassemble all parts and panels. Plug in washer or
reconnect power. Repeat step 1 to verify repair.
¾ If no detergent flowed after at least 2 minutes while
the bulk dispense pump was activated, continue to
step 11.
11. Replace main control and go to step 12.
12. Reassemble all parts and panels. Plug in washer or
reconnect power. Repeat step 1 to verify repair.
RELAY EXPANSION BOARD (FIGURE 1)
J3 - To Main Control Board
J1 Power Cord
J1 Power Cord
J1-2 Neutral
J2-2 Neutral
J1-1 Line
J2-1 Line
J2 Bulk Dispense Pump
J2 Bulk Dispense Pump
J2-7 Line_Out_3
J3-7 Line_Out_3
J2-6 Line_Out_2
J3-6 Line_Out_2
J2-5 Line_Out_1
J3-5 Line_Out_1
J2-4
J3-4
J2-3 Neutral_Out_3
J3-3 Neutral_Out_3
J2-2 Neutral_Out_2
J3-2 Neutral_Out_2
J2-1 Neutral_Out_1
J3-1 Neutral_Out_1
The bulk dispense pump resistance should
be between 1485 ohms and 1815 ohms.
If the resistance value is between 1485
ohms and 1815 ohms, proceed to step 9.
If the resistance value is out of range,
proceed to step 8.
Access the underside of the top as shown in
figure 8, page 23. IMPORTANT: Remove bulk
dispense drawer before accessing underside
of top.
8. Replace the bulk dispense pump.
Inspect the hoses that are connecting the
bulk dispense pump to the detergent drawer
and the detergent dispenser for cracks, holes,
and obstructions. Replace any damaged or
obstructed hoses and proceed to step 10.
9. Replace the Rex board and proceed
to step 10.
10. Reassemble all parts and panels. Plug in
washer or reconnect power. Repeat step 1 to
verify repair.
If no detergent flowed after at least 2
minutes while the bulk dispense pump
was activated, continue to step 11.
11. Replace main control and go to step 12.
12. Reassemble all parts and panels. Plug in
washer or reconnect power. Repeat step 1 to
= pin 1
verify repair.
J2 - To Bulk Dispense Pump
J3
J3-6 Control_Sig_Rel 3
J3-5 Control_Sig_Rel 2
J3-4 Control_Sig_Rel 1
J3-3 Rtn
J3-2 Rex_Detect
J3-1 Vcc_15V
J1 - AC In
Main Control Board
J1 Power
Cord