23
SELF DIAGNOSTIC FUNCTIONS
This unit has the self diagnostic functions shown below.
Self diagnostic
Situation
Indication
Alarm buzzer
Remote alarm
Sensor
abnormality
If the thermal sensor is
disconnected.
Alarm indicator blinks.
E01 and -50 are displayed
alternately.
Intermittent tone
Alarm status
If the thermal sensor is
short-circuited.
Alarm indicator blinks.
E02 and 50 are displayed
alternately.
If the defrost sensor is
disconnected.
Alarm indicator blinks.
E03 and chamber temp.
are displayed alternately.
If the defrost sensor is
short-circuited.
Alarm indicator blinks.
E04 and chamber temp.
are displayed alternately.
If the exclusive alarm sensor is
disconnected.
Alarm indicator blinks.
E13 and chamber temp.
are displayed alternately.
If the exclusive alarm sensor is
short-circuited.
Alarm indicator blinks.
E14 and chamber temp.
are displayed alternately.
Battery check
(with MPR-48B1)
When about 3 years has passed
after plug in.
F-1 and chamber temp.
are displayed alternately.
----- -----
Setting check
(with MPR-48B1)
When the battery switch is
turned ON without setting after
attachment.
E09 and chamber temp.
are displayed alternately.
----- -----
The alarm status of remote alarm terminal is cancelled by pressing the alarm buzzer stop key
(BUZZER) since the remote alarm is operated in conjunction with alarm buzzer. (except for power failure
alarm status)
The error code with smaller figure is displayed if some errors are occurred simultaneously.
The chamber temperature is controlled at about 5
o
C by the defrost sensor if the thermal sensor is
disconnected or short circuited.
SAFETY FUNCTIONS
This unit has the safety functions shown below.
Safety
Situation
Indication, Buzzer
Safety operation
Over-heat
protection
When the chamber temp. is higher
than about 28
o
C.
-----
The defrost heater OFF.
Fan motor for cold air circulation is OFF.
Reset when the chamber temp. is lower
than about 18
o
C.
Over-cool
protection
When the chamber temp. is lower
than about 0
o
C.
-----
Compressor OFF.
Reset when the chamber temp. is higher
than 6
o
C.
Auto-return
When there is no key pressing in
setting mode for 90 seconds.
-----
Finishing of setting mode and returning to
temp. display mode.
Key lock
When the key lock is ON (L1).
-----
Change of chamber temp. setting is disable.
