21
ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions shown in Table 7, and also self diagnostic functions.
Table 7 Alarms and safety functions
Alarm & Safety
Situation
Indication Buzzer
Safety
operation
High temperature
alarm
If the chamber temperature deviates from
the set tempe2
o
C or up to +14
o
C.
Alarm lamp is flashed.
Chamber temperature is
flashed.
Intermittent tone with
about 15 minutes
delay.
Remote alarm with
about 15 minutes delay.
Low temperature
alarm
If the chamber temperature deviates from
the set temperature -2
o
C or up to -14
o
C. Alarm lamp is flashed.
Chamber temperature is
flashed.
Intermittent tone with
about 15 minutes
delay.
Remote alarm with
about 15 minutes delay.
If the chamber temperature is lower than
0
o
C.
Intermittent tone
Remote alarm
Over-heat
protection
When the chamber temp. is higher than
40
o
C. (Reset when the chamber temp.
is lower than 30
o
C)
----- -----
Inside fan, drain pan
heater, defrost heater,
drain pipe heater OFF
Over-cooling
protection
When the chamber temp. is lower than -1
o
C. (Reset when the chamber temp. is
higher than 6
o
C)
----- -----
Compressor
OFF
Power failure
alarm
When the power to the unit is
disconnected.
----- -----
Remote
alarm.
Power failure
alarm (with
MPR-48B1)
At power failure.
If the power supply cord is unplugged.
Alarm lamp blinks.
Intermittent tone
Alarm status.
Door alarm
When the door is open.
Door alarm lamp is lit.
Intermittent tone with
about 2 minutes
delay.
-----
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.
Sensor
abnormality
If the thermal sensor is disconnected.
Alarm lamp is flashed.
E01 and 50
o
C (or -50
o
C)
are displayed alternately.
Intermittent tone
Remote alarm.
Unit keeps continuous
running.
If the thermal sensor is short-circuited.
Alarm lamp is flashed.
E02 and 50
o
C (or -50
o
C)
are displayed alternately.
Intermittent tone
Remote alarm.
Unit keeps continuous
running.
If the defrost sensor is disconnected.
Alarm lamp is flashed.
E03 and chamber temp. are
displayed alternately.
Intermittent tone
Remote alarm.
If the defrost sensor is short circuited.
Alarm lamp is flashed.
E04 and chamber temp. are
displayed alternately.
Intermittent tone
Remote alarm.
If the compressor sensor is
disconnected.
Alarm lamp is flashed.
E05 and chamber temp. are
displayed alternately.
Intermittent tone
Remote alarm.
If the compressor sensor is
short-circuited.
Alarm lamp is flashed.
E06 and chamber temp. are
displayed alternately.
Intermittent tone
Remote alarm.
Battery switch
check (with
MPR-48B1)
When the battery switch is turned ON
without setting after attachment.
E09 and chamber temp. are
displayed alternately.
----- -----
Condenser temp.
Abnormality
In the event of failure of fan motor for
cooling the compressor
When the ambient temperature exceeds
the usable environmental condition, etc.
E10 and chamber temp. are
displayed alternately.
Intermittent tone
Remote alarm.
Compressor OFF.
Battery check
(with MPR-48B1)
When about 3 years have passed with
the plugged-in. (time to replace the
battery)
F-1 and chamber temp. are
displayed alternately.
----- -----
Fan motor check
When about 6 years have passed with
the plugged-in. (time to replace the fan
motor)
F-2 and chamber temp. are
displayed alternately.
----- -----
Note:
The alarm status of remote alarm terminal is cancelled by pressing the buzzer stop key (BUZZER) since
the remote alarm is operated in conjunction with alarm buzzer. (except for power failure alarm status).
When more than two alarm conditions occur simultaneously, the lowest number error code has priority on
the error display.
After a power failure, the unit will resume operation with the set value that was in place before power
failure occurred.
The over-cooling protection may activate when the set temperature is 2
o
C. In this case, the chamber
temperature will rise to 6
o
C, but this is not malfunction.
