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ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions shown in Table 5, and also self diagnostic functions.
Table 5. Alarms and safety functions
Alarm & Safety Situation Indication Buzzer Safety operation
High temperature
alarm
If the chamber temperature is higher
than the temperature at which the
high temperature alarm is activated.
Low temperature
alarm
If the chamber temperature is lower
than the temperature at which the
low temperature alarm is activated.
ALARM lamp is flashed.
Temperature indicator is
flashed.
Intermittent tone with
15 minutes delay.
Remote alarm with 15
minutes delay.
Power failure alarm
When the power to the unit is
disconnected.
ALARM lamp is flashed. Intermittent tone Remote alarm.
Door alarm When the door is open. Door check lamp lights.
Intermittent tone with
2minutes delay.
-----
Filter check When the condenser filter is clogged. Filter check lamp lights. Intermittent tone -----
Battery check
When about 3 years has passed with
power switch ON.
Battery check lamp lights. ----- -----
Fan motor check
When about 5.5 years has passed with
power switch ON.
Battery check lamp
flashed.
----- -----
Auto-return
When there is no key pressing in
each setting mode for 90 seconds.
Chamber temperature is
displayed.
-----
Finishing of each
setting mode.
Key lock When the key lock is ON. ----- -----
Change of setting is
disable.
If the thermal sensor is disconnected.
ALARM lamp is flashed.
E01 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Unit keeps continuous
running.
If the thermal sensor is short-circuited.
ALARM lamp is flashed.
E02 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Unit keeps continuous
running.
If the cascade sensor is disconnected.
ALARM lamp is flashed.
E03 and chamber temp.
are displayed alternately.
Intermittent tone Remote alarm.
If the cascade sensor is short
circuited.
ALARM lamp is flashed.
E04 and chamber temp.
are displayed alternately.
Intermittent tone Remote alarm.
If the filter sensor is disconnected.
ALARM lamp is flashed.
E05 and chamber temp.
are displayed alternately.
Intermittent tone Remote alarm.
Sensor abnormality
If the filter sensor is short-circuited.
ALARM lamp is flashed.
E06 and chamber temp.
are displayed alternately.
Intermittent tone Remote alarm.
Battery switch
check
When the battery switch is OFF during
alarm test.
ALARM lamp is flashed.
E09 is flashed.
----- -----
Condenser temp.
abnormality
In the event of failure of fan motor for
cooling the compressor
E10 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Compressor of high
stage side stops.
Note:
• When the operation is started in high ambient temperature, the filter check lamp is sometimes flashed.
In this case, the lamp is off automatically when the chamber temperature is getting lower.
• The freezer resumes the operation after power failure with the temperature setting before power failure
as the chamber temperature setting and alarm temperature setting are memorized in the volatile memory.
• The chamber temperature is displayed for 5 seconds by pressing buzzer stop key (BUZZER) during
power failure alarm. Then the buzzer is silenced. The alarm lamp keeps flashing.
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