Hoshizaki 73183 service manual C. Thermistor Check

"IV.A.2.9) Defrost" and "IV.C. Thermistor Check." If components fail to start, control module must be replaced.

C. Thermistor Check

In the event the cabinet thermistor reading is out of range (E1 alarm), the compressor operates on a fixed time basis of 5-minutes on and 5-minutes off.

In the event the refrigerator defrost thermistor reading is out of range (E2 alarm), defrost initiation occurs every 4-hours of cumulative compressor run time and terminates on 20-minute minimum defrost timer.

In the event the freezer defrost thermistor reading is out of range (E2 alarm), defrost initiation occurs every 4-hours of cumulative compressor run time and terminates based on cabinet thermistor temperature.

To check thermistor resistance, follow the steps below.

1)Move the power switch to the "OFF" position, then unplug the unit.

2)Remove the control box cover.

3)Disconnect and remove the thermistor in question.

4)Immerse the thermistor sensor portion in a glass containing ice and water for 2 to 3 minutes.

5)Check the resistance between the wires at the thermistor connector. Normal reading is within 16.0 to 16.7 kΩ. If outside the normal reading, replace the thermistor.

6)Reconnect and replace the thermistor in its correct position. See "V.B. Important Notes for Component Replacement."

7)Plug the unit back in. Move the power switch to the "ON" position.

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