Thermo Scientific OGS 100, Operating Instructions Manual

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Error Codes
Thermo Scientific Heratherm 12-3
Calibration value too
low (E105) The calibration reference
value calculated on the
basis of the user input
exceeds the lower limit for
calibration references. Fall back to previous cali-
bration reference. Audible
alarm activated, alarm
relay energized, message
shown on display. Check the external refer-
ence sensor for proper
function and replace, if
necessary. If this doesn’t
solve the problem, call
service.
Constant sensor signal
(E106) None of the decimal
places of the A/D-con-
verter output for the pro-
cess sensor has changed
over a specific time
period. Control transferred to ref-
erence sensor. Audible
alarm activated, alarm
relay energized, message
shown on display. If both
sensors are defective, all
control circuits will be dis-
abled. Call service.
Constant reference
sensor signal (E107) None of the decimal
places of the A/D-con-
verter output for the pro-
cess sensor has changed
over a specific time
period. Process control continues
on set value. Audible
alarm activated, alarm
relay energized, message
shown on display. If both
sensors are defective, all
control circuits will be dis-
abled. Call service.
Heating relay error
(E109) The voltage measure-
ment has indicated a
defect in the heater circuit
relay. Device completely inoper-
ative, audible alarm acti-
vated, alarm relay
energized, message
shown on display. Call service.
Heating triac error
(E110) The voltage measure-
ment has indicated a
defect in the triac. Audible alarm activated,
alarm relay energized,
message shown on dis-
play. Audible alarm
returns upon acknowl-
edgement. Switch off the oven and
call service.
Temperature too high
(E111) Actual measured value
exceeds permissible
range. May occur when
the user lowers the set
point temperature on a hot
device whose door is
closed. Audible alarm activated,
alarm relay energized,
message shown on dis-
play. Heater turned off
until upper limit of hystere-
sis is recovered. Servo
control operations con-
tinue. Alarm can be
acknowledged, and goes
away when the difference
between the actual and
set values ceases to exist.
Note: This error does not
indicate a defective triac. Open the door to speed
up cool-down. Check
whether the device was
loaded with a hot object, if
so, remove. Ensure that
the equipment was oper-
ated with at least one per-
forated shelve and with
the door not opened lon-
ger than 10 min. If this
doesn’t solve the problem,
call service.
For 3P-units only:
when set-point tempera-
ture is stabilized, switch
unit to Standby Mode and
turn-on again. If unit can-
not keep temperature
without failure please call
Technical Support.
Table 12-1 Heratherm Oven Error Codes
Error Message & Code Root Cause Alarm Response
Alarm Clearing Instructions
1