Hoshizaki HWR68A(-D), HWR40A(-D), HUR96A(-D) Defrost Temperature Sensor Malfunction Alarm E8

f. Defrost Temperature Sensor Malfunction Alarm (E8)

If input from the defrost thermistor is below the defrost open circuit detection point (equivalent to -67°F (-55°C)), "E8" is displayed. "E8" is also displayed when input from the defrost thermistor is above the defrost thermistor short circuit detection point (equivalent to 122°F (50°C)) for 10 minutes or more.

Note:

•If this alarm appears, first make sure that the sensor is properly connected.

•A short circuit will not be detected during the first hour after power is turned on. However, a short circuit can be detected immediately by turning on the power

while pressing the button. In this case, "E8" will be displayed immediately if a short circuit is detected.

• A short circuit will not be detected during defrost or fan delay.

Reset Options

The alarm automatically resets when one of the following conditions is met:

•The input from the defrost thermistor exceeds the open circuit detection point (equivalent to -67°F (-55°C)).

•The input from the defrost thermistor drops below the short circuit detection point (equivalent to 122°F (50°C)).

•A functioning defrost thermistor (orange) is installed.

Possible Causes

• Trouble with the defrost thermistor (orange).

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