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Brushless DC Fan motors are used to save energy. The fans operate at two speeds. Fan speed information is read by
the Main PCB. If the fan speed exceeds 600 RPM or the speed is too slow, or stopped the fan drive circuit is disabled,
After 10 seconds the circuit tries again with 3 seconds of DC voltage. If the fan continues this activity for 5 cycles, 10
seconds off 3 seconds on, the fan drive circuit is disabled for 10 minutes.
TO TEST THE FAN CIRCUIT VOLTAGE.
Power off and back on to check the DC voltage to the motor, wait from 10 to 60 seconds for the fan voltage to kick in,
and then check fan voltage, the average reading is 9 VDC. If you get 3 seconds of voltage every 10 seconds for the 5
fan power up cycles, then the Main PCB is good.
NOTE: You may need to put unit in FORCED FREEZE mode to activate the fans/compressor.
If the fan blade is blocked by ice, then defrost and check the motor again, after removing power from the unit.
If the evaporator is ice blocked and thus blocking the air flow, the fan will over RPM and it is stopped. Remove ice and
check the motor again. If everything is clear around the fan blade then the motor would be at fault. Continuous fan errors
will be displayed on the front panel display. PLEASE NOTE: The door switches control the evaporator fan motors. Have
them closed to test the motors. Delay time 10 – 60 seconds.
Defrost – The sensor voltage tells the Main PCB to turn off the
o
Defrost Heater At 50
in Freezer, 63
Compartment Temp – The sensor controls fan/compressor on/
off to maintain temp
Ice Production – harvests when the I/M sensor reads 1.5 de-
grees for 5 minutes, Flex Tray Only.
If the door is opened during that 5 minutes harvest is delayed.
Ambient Sensor
Fan Speeds – Below 60 degrees condenser fan is off
Defrost Timing – The warmer the room the more often
the defrost
Temperature/Resistance/Voltage Chart for Samsung Refrigerators Sensors
Temp.
(Ω)
Volts
-29.2°F
64227
4.326
-27.4°F
61012
4.296
-25.6°F
57977
4.264
-23.8°F
55112
4.232
-22.0°F
52406
4.199
-20.2°F
49848
4.165
-18.4°F
47431
4.129
-16.6°F
45146
4.093
-14.8°F
42984
4.056
-13.0°F
40938
4.018
-11.2°F
39002
3.98
-9.4°F
37169
3.94
-7.6°F
35433
3.899
-5.8°F
33788
3.858
-4.0°F
32230
3.816
-2.2°F
30752
3.773
-0.4°F
29350
3.729
# tsRFG298AA RevC 03/30/2011
DC FAN MOTORS
Sensors
o
in Fridge
Temp.
(Ω)
1.4°F
28021
3.2°F
26760
5.0°F
25562
6.8°F
24425
8.6°F
23345
10.4°F
22320
12.2°F
21345
14.0°F
20418
15.8°F
19537
17.6°F
18698
19.4°F
17901
21.2°F
17142
23.0°F
16419
24.8°F
15731
26.6°F
15076
28.4°F
14452
30.2°F
13857
How to Check Sensor Resistances Accurately
Make ice slurry. To do this, fill a cup with ice
(preferably crushed), then add water and a teaspoon
of salt to make a slush. Mix thoroughly and allow to sit
for 2 to 3 minutes. This will give you a 32*F refer-
ence. Now, lower the sensor into the mixture and
leave for about 1 minute, then check the resistance. It
should be very close to 13,300 ohms. Before reinstall-
ing the sensor, be sure to rinse it with fresh water and
dry it.
Volts
Temp.
(Ω)
3.685
32.0°F
13290
3.64
33.8°F
12749
3.594
35.6 °F
12233
3.548
37.4 °F
11741
3.501
39.2 °F
11271
3.453
41.0°F
10823
3.405
42.8°F
10395
3.356
44.6°F
9986
3.307
46.4°F
9596
3.258
48.2°F
9223
3.208
50.0°F
8867
3.158
51.8°F
8526
3.107
53.6°F
8200
3.057
55.4°F
7888
3.006
57.2°F
7590
2.955
59.0°F
7305
2.904
60.8°F
7032
Volts
Temp.
(Ω)
2.853
62.6°F
6771
2.802
64.4°F
6521
2.751
66.2°F
6281
2.7
68.0°F
6052
2.649
69.8°F
5832
2.599
71.6°F
5621
2.548
75.2°F
5225
2.498
77.0°F
5000
2.449
78.8°F
4861
2.399
80.6°F
4690
2.35
86.0°F
4218
2.301
87.8°F
4072
2.253
89.6°F
3933
2.205
91.4°F
3799
2.158
95.0°F
3547
2.111
96.8°F
3428
2.064
100.4°F
3204
Volts
2.019
1.974
1.929
1.885
1.842
1.799
1.716
1.675
1.636
1.596
1.483
1.447
1.412
1.377
1.309
1.277
1.213
2
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