Hoshizaki HUR40A(-D) - Manual (Page 39)

39
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).