Diagnostic Information
© Viking Range Corporation
SMR-0003
9
Resistance versus Temperature Chart
Temperature (C)
Temperature (F)
Resistance (K-OHMS)
-15
5
11.350
-10
14
8.918
-5
23
6.700
0
32
5.630
5
41
4.520
10
50
3.652
15
59
2.970
20
68
2.430
25
77
2.000
If the thermistor has been tested and is found to be
good, check the temperature of the evaporator plate
and the resistance of the thermistor. If the temperature
of the evaporator plate does not correspond to a proper
resistance from the thermistor, check for a proper and
secure connection of the thermistor to the evaporator
plate bracket.
Thermistors
The wine cellars, beverage centers, and refrigerated
drawers utilize two thermistors: The evaporator
thermistor and the display thermistor. Each thermistor
has a different function for input to the electronic control.
Evaporator thermistor:
The evaporator thermistor turns the unit on and off. It is
secured to the evaporator or cabinet liner.
Display thermistor:
The display thermistor is connected to the LED display
and displays the temperature inside the unit on the
display panel.
The following will happen in the event of one or both
thermistors fail:
If the evaporator thermistor fails, all loads will be
1.
shut off and the unit will not run.
If the evaporator thermistor senses temperature
2.
outside of 0-140 degrees F, all loads will be shut off
and the unit will not run.
The display panel will flash E3 for an evaporator
3.
thermistor failure and E4 for a display thermistor
failure. If both thermistors fail, the error codes will
be displayed sequentially. An audible alarm will also
sound six times every minute if either one or both
thermistors fails.
The thermistor can be checked by use of a multimeter
with the ability to read resistance. To check the
thermistor:
Disconnect and remove thermistor from unit.
1.
Use a reference temperature point that is know
2.
(such as an ice bath) and measure the resistance
across the wire leads.
Compare the recorded resistance with figure in
3.
Resistance versus Temperature Chart.
If measured resistance falls 4% or greater outside the
resistance given below, the thermistor is bad and will
need to be replaced.
