Thermistor Check - Hoshizaki KM-230BAJ Service Manual

7) Replace FS in its correct position and secure it with the two screws. Then connect FS
connector.
8) Replace the right side panel, rear panel and top panel in their correct positions.
9) Plug in the appliance, then move the control switch to the "ICE" position.
Legend: CB–control board; FS-float switch
F. Thermistor Check
A thermistor (semiconductor) is used as a harvest control sensor and anti-slush sensor.
The resistance varies depending on the suction line temperatures. The thermistor
detects the temperature of the evaporator outlet to start the harvest timer or momentarily
stop the pump motor during the freeze cycle. No adjustment is required. If necessary,
check for resistance between thermistor leads, and visually check the thermistor
mounting, located on the suction line next to the evaporator outlet.
Temperature (°F)
0
10
32
50
70
90
Check a thermistor for resistance by using the following procedure:
1) Remove the louver. Move the control switch to the "OFF" position, then unplug the
appliance.
2) Disconnect the connector K1 on the board.
3) Remove the thermistor.
4) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3
minutes.
5) Check for resistance between the thermistor leads. Normal reading is within 4.7 to 6.2
kΩ. Replace the thermistor if it exceeds the normal reading.
Temperature (°C)
-18
-12
0
10
21
32
Resistance (k Ω )
14.401
10.613
6.000
3.871
2.474
1.633
23