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Thermistors
Thermistors are used for various temperature readings.
Thermistors provid e reliable temperature readings
using a resistance which varies based on surrounding
temperatures. If a faulty thermistor is suspected it may be
tested using an accurate ohmmeter.
Both thermistors in the unit are id entical. If a thermistor
is suspected of being d efective, the resistance can be
verified . Place the thermistor in an ice water bath, the
resistance should read 16.lk Ohms +/-5% on your meter.
Thermistor connections must be kept clean. A thermistor
connection that has become corrod ed can cause resistance
values from the thermistor to change as they pass through
a d irty connection to the board.
It is for that reason that we apply dielectric grease to all of
our thermistor connections. Dielectric grease will help to
keep thermistor connections clean and dry.
If you change a thermistor in the unit please re-apply
d ielectric grease to the connection. If you encounter
a d irty thermistor connection, you should replace the
thermistor and the thermistor harness.
Thermistor error information can be found in the Control
Operations - Service section.
This unit has two thermistors.
Thermistor one (Zone):
Located along the right hand sid e wall. It is used to
maintain the operating temperature within that zone.
Thermistor two (Evaporator):
Located on the evaporator. It is used for defrost.
THERMISTOR FAILURE
Zone Thermistor
If the zone thermistor in the unit fails, the unit will
continue to cool in a backup mode ( Self Preservation
Mod e) to preserve the integrity of the contents. The unit
will otherwise operate normally.
Thermistor
Evaporator Thermistor
If the evaporator thermistor fails, the unit will rely on a
preset defrost timer during defrost cycles. The unit will
otherwise operate normally. Refer to defrost section.
Thermistor Resistance Data
Temp (F)
Temp (C)
- 40
- 40
- 31
- 35
- 22
- 30
- 13
- 25
- 4
- 20
- 15
5
- 10
14
- 5
23
32
0
41
5
50
10
59
15
68
20
25
77
86
30
95
35
104
40
113
45
122
50
131
55
140
60
149
65
158
70
167
75
176
80
* ( +/-5%)
36
Nominal Resistance
(OHMS)*
169157
121795
88766
65333
48614
36503
27681
21166
16330
12696
9951
7855
6246
5000
4029
3266
2665
2186
1803
1495
1247
1044
879
743
631
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