Test #5: Temperature Thermistor - Whirlpool Cabrio WTW8500DW Technical Education

TESTING
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
Service Load Control Mode in Service Diagnostic Mode on
page 5-5.
¾ If cold water is being dispensed, proceed to step 2.
¾ If hot water is being dispensed, verify proper hose
connection.
2. Check the hot valve by performing Hot Valve test under
Service Load Control Mode in Service Diagnostic Mode on
page 5-5.
¾ If hot water is being dispensed, proceed to step 3.
¾ 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 J2 from the main control. With an
ohmmeter, measure the resistance of the temperature
THERMISTOR
MAIN BOARD
VALVE THERMISTOR
6-12 Whirlpool 2014 CABRIO
n
For Service Technician Use Only
BK
J2-2
Direct Drive Washer
®
thermistor between pins J2-1 and J2-2. Verify that the
approximate resistance, shown in the table below, is
within ambient temperature range.
Approx. Temperature
F°
32
41
50
59
68
77
86
95
104
113
122
131
140
149
¾ If the resistance is within the range shown in the table,
go to step 6.
¾ If the resistance is infinite or close to zero, replace the
valve assembly.
NOTE: Most thermistor errors are a result of the
resistance being out of range. If the temperature
thermistor malfunctions, the washer will default to pre-
programmed wash settings.
6. If the thermistor is good, replace main control and
perform Service Diagnostics (see page 5-6) to verify repair.
77°F (25°C) = 50k
T
TEMPERATURE THERMISTOR
Figure 1
THERMISTOR RESISTANCE
Approx. Resistance
C°
0
5
10
15
20
25
30
35
40
45
50
55
60
65
MAIN BOARD
BK
J2-1 RTN (VSS)
(KW)
163
127
100
79
62
50
40
33
27
22
18
15
12
10