Hoshizaki JWE-620UA-6B service manual Wash Tank Thermistor Error H1, H2

f) Wash Tank Thermistor Error (H1, H2)

•If the wash tank thermistor senses a temperature at or above 231°F (111°C) (2.4kΩ), the thermistor leads are considered shorted and the wash tank heaters de-energize, "H1" appears in the display, and the buzzer sounds.

•If the wash tank thermistor senses a temperature at or below -6°F (-21°C) (517kΩ), the thermistor leads are considered open and the wash tank heaters de-energize, "H2" appears in the display, and the buzzer sounds.

•After replacing the failed component, the alarm resets.

•See the chart below for possible causes and remedies. Note: When this error occurs, the auto fill cycle will not start.



Code

H 1 / H 2

Error

Thermistor senses abnormal temperature.

Item	Possible Cause
Thermistor	Connector not properly
	connected.

Operation

Continues (wash tank

heater off).

Remedy

Reconnect.

Open circuit (H2).

Replace.

Short circuit (H1).

Replace.

Defective.

Replace.

Control Board

Connector not properly connected.

Reconnect.

Defective.

Replace.

Note: See “III.E. Thermistor Check” and “IV.M. Removal and Replacement of Thermistor.”

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