Grant Instruments LTC4 - Manual (Page 37)

LTC4 31115 V1
Operating Manual Page 36
www.grantinstruments.com
Symptom Possible cause Action required
Display shows
“Low
Temperature
Alarm” Low temperature
warning alarm has
tripped Check that the bath set temperature is correct
(see section 5.2.10).
Check that low temperature alarm is correct
(section 5.3.4).
Check that the liquid level in the bath is
adequate
Unit showing
erratic
temperatures Calibration values not
set correctly Restore the factory calibration settings (see
section 5.4.1) then re-calibrate if required (see
section 5.4).
New calibration
point is not
saved Incorrect calibration
value The temperature calibration point is less than
20°C from an existing calibration point
– choose
a higher temperature (see section 5.4).
The measured liquid temperature is more than
5°C away from selected calibration
temperature.
Only the
Standby icon
can be
highlighted Unit is in standby
mode Highlight and Select the Standby icon and
Press “S” to exit Standby mode.
Icons can be
highlighted but
not selected Program running Wait until program has finished or stop program
Select a program
number but icon
changes to “–“
Program not setup Set-up and download a program using Grant
Labwise software
Stirrer motor not
rotating Unit is in Standby
Mode
Stirring propeller or
pump impeller is
obstructed
Faulty motor Highlight the Standby Icon on the control
screen and press S button to return to normal
operation
Clear obstruction.
Have a competent person check the motor or
contact Grant.
Display shows
“Over
temperature
Alarm
”.
Over-temperature
cut-out has operated Check the set temperature is correct and that
the over-temperature cut-out temperature is set
at least 5°C above the set temperature (see
section 5.2.6 for setting instructions).
If the over-temperature cut-out temperature is
correctly set but
the unit still shows a “Over
temperature Alarm ” then the unit has an internal
fault and must be repaired before it is used
again.