Whirlpool WFW94HEXW2 Troubleshooting Manual page 19

FOR SERVICE TECHNICIAN'S USE ONLY
9. Visually check that connector PS8 is
inserted all the way into the CCU (refer to
CCU diagram on page 13). Also check that
the pressure switch harness is securely
connected to the switch.
10. Check the harness between the CCU and
Pressure Switch for continuity.
 If there is continuity, go to step 11.
 If there is no continuity, repair or replace
as necessary.
11. Disconnect PS8 from the CCU and
perform the continuity checks listed in the
chart on page 18. This check can also be
performed at the pressure switch.
a. With no pressure to the switch, there
should be continuity across PS8, pins 4
& 6 (switch pins 11 & 12).
b. Lightly blow into the pressure switch until
a "click" is heard. Maintain that pressure and
verify that there is continuity across PS8, pins
4 & 5 (switch pins 11 & 14).
c. Strongly blow into the pressure switch.
Maintain that pressure and verify that there is
continuity across PS8, pins 4 & 3 (switch pins
11 & 16).
 If the pressure switch passes the continuity
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 Diagnostic Test"
on page 6 to verify repair.
TEST #8: Drain Pump
Perform the following checks if washer does
not drain.
1. Check for obstructions in the usual areas.
Clean and then perform step 2.
2. Check the drain pump and electrical
connections by performing the "Quick
Diagnostic Test" on page 6. The following
procedures assume that this step was
unsuccessful.
DO NOT REMOVE OR DESTROY
3. Unplug washer or disconnect power.
4. Remove top panel to access machine
electronics.
5. Visually check that the DP2 connector is
inserted all the way into the CCU. Refer to
CCU diagram on page 13.
 If visual check passes, go to step 6.
 If connector is not inserted properly,
reconnect DP2 and repeat step 2.
6. Remove connector DP2 from the CCU.
With an ohmmeter, measure the resistance
across pins 1 and 2.
7. Resistance should be approximately 16 Ω.
 If the reading is infinite (open), go to step 8.
 If the reading is correct, go to step 12.
8. Remove the front panel to access drain
pump. Verify pump is free from obstructions.
9. Visually check the electrical connections
at the drain pump.
 If visual check passes, go to step 10.
 If connections are loose, reconnect the
electrical connections and repeat step 2.
10. With an ohmmeter, check harness for
continuity between the drain pump and CCU.
 If there is continuity, go to step 11.
 If there is no continuity, replace the lower
machine harness and repeat step 2.
11. With an ohmmeter, measure the resistance
across the two pump terminals. Resistance
should be approximately 16 Ω.
 If the reading is infinite (open), replace the
drain pump assembly.
 If the reading is correct, go to step 12.
12. If the preceding steps did not correct the
drain problem, replace the CCU.
 Unplug washer or disconnect power.
 Replace the CCU.
 Reassemble all parts and panels.
 Perform the "Quick Diagnostic Test"
on page 6 to verify repair.
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