Bench Top User’s Manual
Troubleshooting
8.1.1 Alarm Indicator Light
The following faults will cause the Alarm Indicator Light to be illuminated and the chamber to be shut down:
TABLE 8.3. ALARM TABLE
Type Device Trouble Cause Remedial Action
1st
OHP/
OCP
(Optional)
Test area tem-
perature
exceeds the
overheat/over-
cool protector
setting (instru-
mentation
panel).
Temperature was
driven up by heat
generated from
specimens or the
overheat protector
is set too low.
Turn OFF Chamber Run Switch. Remove heat
sources from the test area and set the overheat
protector higher. Then press the Fault Reset
switch to reset the alarm and turn the Chamber
Run Switch to the run position. If the same
alarm occurs again, call for service.
Possible causes
include infiltrating of
outside air, exces-
sive cooling, the
effects of cooling
sources inside the
chamber, and the
overcool protector
being set too high.
Turn Chamber Run Switch off and check the
test area door and cable port are closed. If
caused by excessive cooling sources inside the
test area, reduce their number. Then press the
Fault Reset switch to reset the alarm and turn
the Chamber Run Switch to the run position.
Resume testing. If the same alarm occurs
again, call for service.
MTS The thermal
protector in
the air circula-
tor motor
tripped
because of
abnormally
high tempera-
ture.
The air circulator
motor is over-
loaded. Fan or fan
shaft is binding or
obstructed.
Turn Chamber Run Switch off. Remove shaft/
fan obstruction and leave the chamber OFF for
a while to cool the air circulator. Then press the
Fault Reset switch to reset the alarm and turn
the Chamber Run Switch to the run position.
Resume testing. If the same alarm occurs
again, call for service.
WTS The humidi-
fier’s boil-dry
protector
tripped
because of
high surface
temperature.
Humidifier surface
temperature rose
above the trip tem-
perature.
Turn Chamber Run Switch off. Check water
level in the humidifying tray water level regula-
tor. Leave the chamber OFF for a while to cool
the humidifier. Then press the Fault Reset
switch to reset the alarm and turn the Chamber
Run Switch to the run position. Resume testing.
If the same alarm occurs again, call for service.
Thermal
Fuse
Test area tem-
perature
exceeded
chamber lim-
its.
Test area tempera-
ture exceeded
chamber limits,
possibly due to a
component failure.
Thermal fuse will need to be replaced. Remove
power from machine, and try to determine the
cause of the overheat condition before replac-
ing thermal fuse. Call service if necessary.
Once thermal fuse has been replaced, reapply
power to chamber, press the Fault Reset
Switch to reset the alarm and turn the Chamber
Run Switch to the run position. Monitor cham-
ber temperature to make sure it does not
exceed set limit.
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