Дополнительное Руководство для Hoshizaki rf28a

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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, drain or fan delay.

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.

• Trouble with the defrost thermistor (orange).