Hoshizaki HPR100A, Service Manual

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4. High Condenser Temperature Alarm (clogged filter) (E7)
The unit is equipped with a condenser air filter to protect the condenser from dirt, grease,
etc. The condenser air 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 condenser thermistor to determine if the condenser or condenser air
filter is excessively dirty. If the condenser thermistor detects a temperature that exceeds
the preset temperature value (136.4°F (58°C)) for over 2 minutes, "E7" will be displayed.
CAUTION
Failure to take action when this alarm activates could result in damage to the
compressor.
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 (for further details see "III.B. Service Chart")
• The condenser or condenser air filter is dirty.
• The condenser fan motor is not functioning.
Note: If the power is turned off and then back on while the alarm signal is displayed,
the alarm may be reset even if the condenser or condenser air filter has not
been cleaned. However, the alarm will repeat once the compressor discharge
temperature reaches 136.4°F (58°C).
E7 Alarm
Reset
2 min
High
E7 Alarm Temp.
136.4°F (58°C)
Temperature Display
E7 Alternating
with Temperature
E7 Alarm Timer Start
Low
E7 Alarm