ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions shown in Table 3, and also self diagnostic functions.
Table 3. Alarms and safety functions
Alarm & safety
Situation
Indication
Buzzer
Safety
operation
Operation memory
Record of chamber condition during the
power failure.
The memory of the set point before the
power failure.
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The set value is
memorized by
nonvolatile memory.
The freezer resumes
the operation with
setting before power
failure.
Key lock
When the key lock is on.
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Setup can not be
changed.
Auto-return
When there is no key pressing in
each setting mode for 90 seconds.
Chamber temperature is
displayed.
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Finishing of each
setting mode.
Battery check
When about 3 years has passed with
power switch ON.
Message indication:
“Please exchange
batteries.”
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Fan motor check
When a power switch was turned on
and it passed for about 6 years.
Message indication:
“Please exchange a fan
motor.”
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If the thermal sensor is disconnected.
Message indication:
“Error E01: Temp sensor is
open.”
Intermittent tone
Remote alarm.
Unit keeps continuous
running.
If the thermal sensor is short-circuited.
Message indication:
“Error E02: Temp sensor is
shorted.”
Intermittent tone
Remote alarm.
Unit keeps continuous
running.
If the cascade sensor is disconnected.
Message indication:
“Error E03: Cascade
sensor is open.”
Intermittent tone
Remote alarm.
If the cascade sensor is short circuited.
Message indication:
“Error E04: Cascade
sensor is shorted.”
Intermittent tone
Remote alarm.
If the filter sensor is disconnected.
Message indication:
“Error E05: Filter sensor is
open.”
Intermittent tone
Remote alarm.
If the filter sensor is short-circuited.
Message indication:
“Error E06: Filter sensor is
shorted.”
Intermittent tone
Remote alarm.
If the ambient temperature sensor is
disconnected.
Message indication:
“Error E07: Ambient temp
sensor is open.”
Intermittent tone
Remote alarm.
Sensor abnormality
If the ambient temperature sensor is
short-circuited.
Message indication:
“Error E08: Ambient temp
sensor is shorted.”
Intermittent tone
Remote alarm.
Battery switch check
When the battery switch is OFF during
alarm test.
Message indication:
“Error E09: Battery switch
is off.”
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Condenser temp.
abnormality
In the event of failure of fan motor for
cooling the compressor
Message indication:
“Error E10: Condenser
temp. is abnormal.”
Intermittent tone
Remote alarm.
Compressor of high
temp. side stops.
Note:
• When the operation is started in high ambient temperature, the alarm lamp (ALARM) sometimes flashes,
and then the message (Please check a condenser filter) of the filter alarm is indicated on it in the basic
screen. 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 nonvolatile
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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