Chapter 7 Troubleshooting
87
Ty
pe
Displayed alarm
code/channel
code (option)
Trouble Cause
Remedial
action
1st
2
The temperature inside the
cabinet has risen above the
absolute high limit. The
cabinet has been stopped.
Either specimens
inside the cabinet are
generating heat or the
absolute high limit is
set too low.
Turn control power OFF from the
POWER key. Then, remove the
heat-generating specimens and/or
set the absolute high limit about
15°C higher than the target
temperature. Resume testing. If the
same alarm occurs again, call for
service.
1st
3
The temperature inside the
cabinet has dropped below
the absolute low limit. The
cabinet has been stopped.
Possible causes
include infiltrating of
outside air, excessive
cooling, the effects of
cooling sources
inside the cabinet,
and the absolute low
limit being set too
high.
Turn control power OFF from the
POWER key and check the
cabinet door and cable port. Reset
the refrigerator control setting. If
cooling sources are overcooling the
cabinet, reduce their number. Also,
correct the absolute low limit
setting as necessary. Then,
resume testing. If the same alarm
occurs again, call for service.
1st
6
The temperature inside the
cabinet has risen above the
overheat protector setting
(instrumentation panel). The
cabinet has been stopped.
Either specimens
inside the cabinet are
generating heat or the
overheat protector is
set too low.
Turn control power OFF from the
POWER key. Remove the
heat-generating specimens and/or
correct the overheat protector
setting. Resume testing. If the
same alarm occurs again, it is
possible that the thermal fuse has
blown. Call for service.
1st
7
The built-in temperature
switch of the air circulator
motor (water circuit [heat
exhaust] compartment)
tripped because the motor
was abnormally hot. The
cabinet has been stopped.
The air circulator
motor is overloaded.
Leave the cabinet OFF until the air
circulator cools down. Then, turn
control power ON from the
POWER key and resume
testing.
1st
21
Humidifier surface
temperature rose and tripped
the boil-dry protector. The
cabinet has been stopped.
Humidifier surface
temperature rose
above the trip
temperature.
Turn control power OFF from the
POWER key and check water
level in the humidifying tray water
level regulator. Reposition the
regulator as necessary and wait till
the humidifier cools. Then, resume
testing. If the same alarm occurs
again, call for service.
2nd
22
The humidity inside the
cabinet has risen above the
absolute high limit. Humidity
control has been stopped
until humidity returns within
range.
The absolute high
limit is set lower than
the target humidity.
Set the absolute high limit about
10%RH higher than the target
humidity. When humidity returns
within range, normal control is
restored automatically. The alarm
can be cleared by pressing the
or
keys.
Cont.
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