Thermistor Check; Control Switch; Mode Switch - Hoshizaki KM-660MAJ-E Service Manual

F. Thermistor Check
To check thermistor resistance, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel. Move the control switch to the "OFF" position, then remove the
top and right side panels.
3) Remove the thermistor from the refrigerant tubing.
4) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 min.
5) Disconnect the thermistor connector from CB K3 connector and check the resistance
between thermistor leads. Normal range is 4.7 to 6.2 kΩ. If outside the normal range,
replace the thermistor. See "IV.B. Component Service Information." If within the normal
range, continue to the next step.
6) Replace the thermistor in its correct position. See "IV.B. Component Service
Information."
7) Reconnect the thermistor connector to CB K3 connector.
8) Replace the right side and top panels in their correct positions.
9) Move the control switch to the "ICE" position.
10) Replace the front panel in its correct position.
11) Turn on the power supply.
12) Once the harvest cycle starts (Comp energizes), begin timing the harvest cycle.
13) The harvest timer and harvest cycle should terminate within 2 to 5 min. If the harvest
cycle does not terminate within 2 to 5 min., replace CB.
Legend: CB–control board; Comp–compressor
G. Control Switch
The control switch has two positions: "ON for power on, "PUMP" to energize the pump
motor and circulate the water in the water tank.
H. Mode Switch
The mode switch has two positions: "ICE" for icemaking cycle, "CLEAN" for initiating the
cleaning and sanitizing program.
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