Hoshizaki HUR40a ユーザーズマニュアル

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If the input from the clogged filter sensor is below the clogged filter sensor open circuit 
detection point (equivalent to -7.6°F (-°C)), "E9" is displayed. "E9" is also displayed 
when input from the clogged filter sensor is above the clogged filter sensor short circuit 
detection point (equivalent to 186.8°F (86°C)) for 10 minutes or more. 

Note:

• If this alarm appears, first make sure that the sensor is properly connected. 
• A short circuit can be detected immediately by turning on the power while pressing 

the 

 button. In this case, "E9" will be displayed immediately if a short circuit is 

detected. 

Reset Options
The alarm automatically resets when one of the following conditions is met:
• The input from the clogged filter sensor exceeds the open circuit detection point 

(equivalent to -7.6°F (-°C)).

• The input from the clogged filter sensor drops below the short circuit detection point 

(equivalent to 186.8°F (86°C)).

• A functioning clogged filter sensor (gray) is installed.

Possible Causes
• Trouble with the clogged filter sensor (gray).