19
The following will happen in the event of a thermistor failure:
If the evaporator thermistor fails, all loads will be shut off and the unit will not run.
1.
If the evaporator thermistor senses temperature outside of 0-140 degrees F, all loads will be shut off and the unit will not run.
2.
The control LED will blink three times every five seconds.
3.
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 (such as an ice bath) and measure the resistance across the wire leads.
2.
Compare the recorded resistance with Table C.
3.
If measured resistance falls outside the resistance given in Table C within 4% of the value, the thermistor is bad and will need to be
replaced.
Table C: 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.
Removing the evaporator thermistor:
Remove any ice and drain the reservoir by pulling the drain plug.
1.
Disconnect power, water line, and drain line.
2.
Remove the back panel and lower shroud (see Figure 3.3).
3.
Disconnect the evaporator thermistor connector at the electronic controller.
4.
Remove the escutcheon panel from inside the unit.
5.
Remove the cutter-grid (see Section 6.1, Cutter-Grid).
6.
Remove the ice deflector.
7.
Remove the reservoir (see Section 6.2, Reservoir).
8.
Remove the evaporator thermistor by removing the screw securing it.
9.
Feed the thermistor wire out through the opening in the back of the unit.
10.
Installing the evaporator thermistor:
Reverse the removal procedure for installation (see above). Be sure to thoroughly tighten the screw holding the thermistor for
proper bracket to thermistor contact.
SySTEM COMpONENTS
Summary of Contents for RF151
Page 1: ...1 ICE MAker Service manual Models RF15I ...
Page 2: ......
Page 28: ...26 Figure 7 1 Ice Maker Wiring Diagram WIRING ...
Page 40: ...38 NOTES ...
Page 41: ...39 NOTES ...
Page 42: ...40 NOTES ...
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