18
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 deviates
from the set tempe2
o
C or up to
+14
o
C.
ALARM lamp is flashed.
Temperature indicator is
flashed.
Intermittent tone with
15 minutes delay.
Remote alarm with 15
minutes delay.
If the chamber temperature deviates
from the set temperature -2
o
C or up to
-14
o
C.
Intermittent tone with
15 minutes delay.
Remote alarm with 15
minutes delay.
Low temperature
alarm
If the chamber temperature is lower
than 0
o
C.
ALARM lamp is flashed.
Temperature indicator is
flashed.
Intermittent tone
Remote alarm
Over-heat
protection
When the chamber temp. is higher
than 28
o
C. (Reset when the chamber
temp. is lower than about 18
o
C)
----- -----
Inside fan, drain pan
heater, defrost heater
OFF
Over-cooling
protection
When the chamber temp. is lower than
-1
o
C. (Reset when the chamber
temp. is higher than 8
o
C)
----- -----
Compressor
OFF
Power failure alarm
When the power to the unit is
disconnected.
----- -----
Remote
alarm.
Door alarm
When the door is open.
Door check lamp is lit.
Intermittent tone with
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.
If the thermal sensor is disconnected
or short-circuited.
ALARM lamp is flashed.
E01 and 50
o
C (or -50
o
C)
are displayed alternately.
Intermittent tone
Remote alarm.
Operation by the defrost
sensor
If the defrost sensor 1 is disconnected
or short-circuited.
ALARM lamp is flashed.
E02 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Unit keeps running.
Thermal sensor
abnormality
If the defrost sensor 2 is disconnected
or short-circuited. (MPR-1013,1013R
only)
ALARM lamp is flashed.
E03 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Unit keeps running.
Memory back-up
When power failure or disconnected
the power cord.
-----
-----
Set value memorized
Note:
The remote alarm is silenced by pressing the buzzer stop key (BZ) as the remote alarm is operated in
conjunction with the buzzer, except for the power failure alarm.
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 8
o
C, but this is not malfunction.
