Whirlpool MVWC400XW Technical Education page 79

TROUBLESHOOTING GUIDE (continued)
FOR SERVICE TECHNICIANS ONLY
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 #5: Temperature Thermistor
This test checks valves, main control,
temperature thermistor, and wiring.
1. Check the cold valve by performing Cold
Valve test under Manual Test Mode.
If cold water is being dispensed, proceed
to step 2.
If hot water is being dispensed, verify proper
hose connection.
2. Check the hot valve by performing Hot Valve
test under Manual Test Mode.
If hot water is being dispensed, proceed to
step 3.
If cold water is being dispensed, ensure that
household hot water is present.
3. Unplug washer or disconnect power.
4. Remove console to access main control.
5. Remove connector J3 from the main control.
With an ohmmeter, measure the resistance
of the temperature thermistor between pins
J3-9 and J3-10. Verify that the approximate
resistance, shown in the table (this page),
is within ambient temperature range.
3. Unplug washer or disconnect power.
4. Remove console to access main control.
5. Remove connector J3 from the main
control. With an ohmmeter, measure the
resistance of the temperature thermistor
between pins J3-9 and J3-10. Verify that the
approximate resistance, shown in the table
below, is within ambient temperature range.
THERMISTOR RESISTANCE
Approx. Temperature
F°
32
41
50
59
68
77
86
95
104
113
122
131
140
149
If the resistance is within the range shown

If the resistance is within the range shown
in the table, go to step 6.
in the table, go to step 6.
If the resistance is infinite or close to zero,

r p e c a l t e e h
If the resistance is infinite or close to
NOTE: Most thermistor errors are a result
zero, replace the temperature thermistor
of the resistor being out of range. If the
assembly.
temperature thermistor malfunctions, the
washer will default to pre-programmed
NOTE: Most thermistor errors are a result
wash settings.
of the resistor being out of range. If the
6. If the thermistor is good, replace main
temperature thermistor malfunctions, the
control and calibrate washer. Perform Automatic
washer will default to pre-programmed
Test to verify repair.
wash settings.
6. If the thermistor is good, replace main control
and calibrate washer. Perform Automatic
Test to verify repair.
TEST #6: Water Level
This test checks the water level sensing
components. NOTE: Usually, if the pressure
transducer malfunctions, the washer will
generate a long fill, or long drain error.
1. Check the functionality of the pressure
transducer by running a small load cycle.
The valves should turn off automatically
after sensing the correct water level in the
tub. The following steps assume that this
step was unsuccessful.
2. Drain the tub until all water has been
removed.
3. Unplug washer or disconnect power.
6-12
Approx. Resistance
C° (K )
0 163
5 127
10 100
15 79
20 62
25 50
30 40
35 33
40 27
45 22
50 18
55 15
60 12
65 10
e t m e p a r r u t t e e h m r s i r o t s a e s
the pressure dome
6. Check to ensu
the lower cabinet a
by the back panel.
7. Verify there is n
the hose or dome.
control and blow in
or debris.
8. Check hose fo
9. If the preceding
problem, replace m
washer. Perform A
TEST #7: Drain
Perform the follow
not drain.
NOTE: Refer to Fig
Circuit" for tests an
IMPORTANT: Dra
accessing bottom
1. Check for obst
Clean and then pe
2. Check the drain
connections by per
m b . y l
Manual Test Mode
steps assume that
3. Unplug washe
4. Remove conso
5. Visually check
inserted all the wa
If visual check

If connector is

reconnect J16