Grant Instruments LTC4 - Manual (Page 38)

31115 V1 LTC4
Page 37 Operating Manual
www.grantinstruments.com
Symptom Possible cause Action required
Display shows
“Low liquid
Alarm
”
Liquid level has
dropped below
minimum level Check that the liquid level in the bath is
adequate
Display shows
“Internal
temperature
probe Fault” Faulty temperature
probe Have a competent person check the probe for
an open or short circuit fault or contact Grant.
Display shows
“Internal/External
Temp Diff Too
Big”
There is a
temperature
difference of more
than 5 degrees
between the internal
and external probe Check the external probe is properly connected
at the rear panel.
Check the external probe is correctly positioned
in the bath liquid and circulation is not
restricted.
If the external probe is not required, select the
internal probe using the Settings menu
Display shows
“Overheating-
Power reduced ”
Heating water at or
near to boiling
without lid
Heating very large
volumes of liquid with
large thermal losses Add a lid to reduce thermal losses and leave
unit running with the “Overheating” warning
present. If the alarm has not cleared within 1
hour contact Grant.
Add measures to reduce thermal losses and
leave unit r
unning with the “Overheating”
warning present. If the alarm has not cleared
within 1 hour contact Grant.
Display shows
“Service required
01
”
Faulty fuse(s), relay
or heater element Have a competent person check the product or
contact Grant.
Display shows
“Service required
02
”
Pump or propellor is
obstructed
Faulty motor Remove obstruction.
Have a competent person check the product or
contact Grant
Display shows
“Cross-check
Failure” PCB fault Have a competent person check the product or
contact Grant.
For any other errors or service requests, please contact Grant Instruments service
department.