Hoshizaki KM-201BAH User Manual

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1) Check the dip switch settings to assure that S1 dip switch 3, 4, 7, 8, 9 & 10 and S2 

dip switch 1 through 6 are in the factory default position. S1 dip switch 1, 2, 5, & 6 are 
cleaning adjustments and the settings are fl exible.

2) Move the control switch to the “ICE” position and check for proper control voltage. If 

the “POWER OK” LED is on, the control voltage is good. If the “POWER OK” LED 
is off, check the control transformer circuit. If no voltage is present, check the power 
supply circuit.

3) To perform a relay sequence test, turn on the power switch while pressing the 

“OUTPUT TEST” button. The correct lighting sequence should be 5, 6, 7, 8, 9, 4. 
Some components (e.g., the compressor) will cycle during test. Each LED comes on 
for 5 seconds. LED 5 is on while LED 6 is on. Following the output test sequence, the 
icemaker will resume normal operation beginning with the 1 minute fi ll cycle.

The dip switches should be adjusted to the factory default settings as outlined in this 
manual.

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)

Temperature (°C)

Resistance (kΩ)

0

-18

14.401

10

-12

10.613

32

0

6.000

50

10

3.871

70

21

2.474

90

32

1.633

Check a thermistor for resistance by using the following procedure:

1)  Disconnect the connector K1 on the board.

2)  Remove the thermistor. See “V. 17. THERMISTOR”.

3) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 

minutes.