Maytag MHW9000YW0 Mode D'emploi page 19

FOR SERVICE TECHNICIAN'S USE ONLY
4. Unplug washer or disconnect power.
5. Remove top panel to access machine
electronics.
6. Visually check that connector FM3 is
inserted all the way into the CCU. Refer
to CCU diagram on page 13.
 If visual check passes, go to step 7.
 If connector is not inserted properly,
reconnect FM3 and repeat step 1.
7. With an ohmmeter, check the harness
between the CCU (FM3) and flow meter
for continuity.
 If there is continuity, go to step 8.
 If there is no continuity, replace the flow
meter harness.
8. With voltmeter set to DC, connect leads
to FM3 pins 1 and 3. Run a wash cycle and
measure the flow meter voltage when the inlet
water valves open and water is entering the
washer. A nominal reading of approximately
200mV should be measured when water
is flowing through the flow meter (voltage
will vary depending on household water
pressure). No water flowing = 0V.
 If voltage is present, the flow meter is
working properly. Go to step 9.
 If voltage is not present when water is
entering the washer, replace the flow meter.
9. 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.
Water Temperature Controls
3 Heating Element – Test #10
3 Temperature Sensor – Test #11
TEST #10: Heating Element
This test checks the heating element, wiring,
and CCU.
1. Unplug washer or disconnect power.
2. Remove top panel to access machine
electronics.
DO NOT REMOVE OR DESTROY
3. Disconnect connector HE2 from the CCU.
Refer to CCU diagram on page 13.
4. Using an ohmmeter, measure the resistance
across pins 1 and 2 of connector HE2.
 If the resistance is between 10-20 Ω, the
heating element and wiring are good; go
to step 8.
 If the resistance is open, go to step 5.
5. Remove back panel to access the heating
element.
6. Disconnect the wire connectors from the
heating element. See Figure 14.
7. Using an ohmmeter, measure the
resistance across the two heating element
terminals.
 If the resistance is between 10–20 Ω, the
heating element is good; replace the lower
main harness.
 If the resistance is open, replace the
heating element.
8. If the preceding steps did not correct the
heating element 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.
Temperature Sensor
Heater Terminal
Figure 14 - Heater & Temperature Sensor
TEST #11: Temperature Sensor
This test checks the temperature sensor,
wiring, and CCU.
1. Unplug washer or disconnect power.
2. Remove top panel to access machine
electronics.
3. Disconnect connector SET2 from the CCU.
Refer to CCU diagram on page 13.
4. Using an ohmmeter, measure the
resistance across pins 1 and 2 of temperature
sensor connector SET2. The measured
resistance should be within the temperature
range shown in the following table.
Assembly Removal Nut
GND
Heater Terminal
(not used)
PAGE 19