Hoshizaki HUR40A(-D) - Manual (Page 40)

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g. Clogged Filter Sensor Malfunction Alarm (E9)
If the input from the clogged filter sensor is below the clogged filter sensor open circuit
detection point (equivalent to -7.6°F (-22°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 (-22°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).