Thermistor Failure - U-Line UHRE124-WS81A User Manual & Service Manual

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USER GUIDE
USER GUIDE
Thermistors
Thermistor
Thermistors are used for various temperature readings.
Thermistors are used for various temperature readings.
Thermistors provide reliable temperature readings using a
Thermistors provide reliable temperature readings
resistance which varies based on surrounding temperatures.
using a resistance which varies based on surrounding
If a faulty thermistor is suspected, it may be tested using
temperatures. If a faulty thermistor is suspected it may be
an accurate ohmmeter.
tested using an accurate ohmmeter.
Thermistor connections must be kept clean. A thermistor
Both thermistors in the unit are identical. If a thermistor
connection that has become corroded can cause resistance
is suspected of being defective, the resistance can be
values from the thermistor to change as they pass through
verified. Place the thermistor in an ice water bath, the
a dirty connection to the board.
resistance should read 16.1k Ohms +/-5% on your meter.
It is for that reason that we apply dielectric grease to all of
Thermistor connections must be kept clean. A thermistor
our thermistor connections. Dielectric grease will help to
connection that has become corroded can cause resistance
keep thermistor connections clean and dry.
values from the thermistor to change as they pass through
a dirty connection to the board.
If you change a thermistor in the unit, please re-apply
dielectric grease to the connection. If you encounter a dirty
It is for that reason that we apply dielectric grease to all of
thermistor connection, you should replace the thermistor
our thermistor connections. Dielectric grease will help to
and the thermistor harness.
keep thermistor connections clean and dry.
This unit has one thermistor located along the right hand
If you change a thermistor in the unit please re-apply
sidewall of the ice bin. It is used to maintain the ice level in
dielectric grease to the connection. If you encounter
the bin.
a dirty 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 one thermistor.
Thermistor one (Zone):
Located along the right hand side wall. It is used to
maintain the operating temperature within that zone.

THERMISTOR FAILURE

Zone Thermistor
If the zone thermistor in the unit fails, the unit will
continue to cool in a backup mode (Self Preservation
Mode) to preserve the integrity of the contents. The unit
will otherwise operate normally.
Thermistor
Thermistor
Thermistor Resistance Data
Thermistor Resistance Data
Temp (F)
Temp (C)
-40
-40
-31
-35
-22
-30
-13
-25
-4
-20
5
-15
14
-10
23
-5
32
0
41
5
50
10
59
15
68
20
77
25
86
30
95
35
104
40
113
45
122
50
131
55
140
60
149
65
158
70
167
75
176
80
-
5%)
* (+/
44
u-line.com
u-line.com
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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