Whirlpool WFW94HEX - Pressure Switch (Non-Steam Models)

5-12
FOR SERVICE TECHNICIAN’S USE ONLY
COMPONENT TESTING (continued)
Pressure Switch (Non-Steam Models)
This test checks the pressure switch, CCU,
and wiring. NOTE: Usually, if the pressure
switch malfuncons, the washer will generate
a long fill or long drain error.
1. Check the funconality of the pressure
switch by running a small load cycle. The valves
should turn off automacally aer sensing the
correct water level in the tub. The following
steps assume that this step was unsuccessful.
2. Press START/PAUSE to stop the cycle and
then press POWER. The cycle will cancel and
drain the water from the tub.
3. Unplug washer or disconnect power.
4. Remove top panel to access machine
electronics. Pressure switch is located
at top right rear of cabinet.
5. Check hose connecon between the
pressure switch and the pressure dome
aached to the tub.
6.
Check to ensure hose is routed correctly in
the lower cabinet and not pinched or crimped.
7. Verify there is no water, suds, or debris
in the hose or dome. Disconnect hose from
pressure switch and blow into hose to clear
water, suds, or debris.
8. Check hose for leaks. Replace if needed.
9. Visually check that connector PS8 is
inserted all the way into the CCU (refer to
CCU diagram). Also check that
the pressure switch harness is securely
connected to the switch.
10. Check the harness between the CCU and
Pressure Switch for connuity.
� If there is connuity, go to step 11.
� If there is no connuity, repair or replace
as necessary.
11. Disconnect PS8 from the CCU and
perform the connuity checks listed in the
chart below. This check can also be performed
at the pressure switch.
a. With no pressure to the switch, there
should be connuity across PS8, pins 4
& 6 (switch pins 11 & 12).
b. Lightly blow into the pressure switch unl
a “click” is heard. Maintain that pressure and
verify that there is connuity across PS8, pins
4 & 5 (switch pins 11 & 14).
c. Strongly blow into the pressure switch.
Maintain that pressure and verify that there is
connuity across PS8, pins 4 & 3 (switch pins
11 & 16).
� If the pressure switch passes the connuity
check, go to step 12.
� If not, replace the pressure switch and
perform step 1 to verify repair.
12. If the preceding steps did not correct the
problem, replace the CCU.
� Unplug washer or disconnect power.
� Replace the CCU.
� Reassemble all parts and panels.
� Perform the “Quick Diagnosc Test”
on pages 5–6 to verify repair.
Figure 6 - Pressure Switch
Heater Trip Wash Level Vcc Overflow
CCU PS8 Pinout 6 5 4 3
Press Sw Pinout 12 14 11 16
No Pressure Closed Open Common Open
Low Pressure Open Closed Common Open
High Pressure Open Closed Common Closed
Pressure Switch Continuity Check
to verify repair.