Hoshizaki HUR40A(-D) - Manual (Page 38)

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e. Clogged Filter Alarm (E7)
The unit is equipped with a filter for protecting the condenser from dirt, oils, grease, etc.
The filter promotes clean condenser surfaces and efficient operation and should be
checked twice monthly and cleaned when necessary. The unit is also equipped with a
sensor to determine if this filter is excessively dirty. If the unit detects that the condenser
filter is excessively dirty by sensing a temperature at the condenser outlet of at least
136.4°F (58°C) for over 2 minutes, "E7" will be displayed.
Reset Options
After cleaning the filter, the alarm will automatically reset once the temperature at the
condenser outlet drops below 136.4°F (58°C).
Possible Causes
• The condenser air filter is dirty.
• The condenser fan motor is locked or otherwise not functioning.
IMPORTANT
If this alarm occurs frequently, the compressor discharge temperature is
consistently too high.
Note:
• If the unit is turned off and then back on while the alarm code is displayed, the
alarm may be reset even if the filter is not yet clean. However, the alarm will recur
once the compressor discharge temperature reaches 136.4°F (58°C).