Grant Instruments CS200G - Manual (Page 10)

OLS200, CSG200
15214 Ver 9 - January 2010 57U
Operating Manual Page 9 www.grant.co.uk
5 Fault diagnosis
Whilst it is not possible to cover all fault conditions, the following procedures provide guidance for
solving simple faults which can occur in normal operation. The operator should not attempt to cure
internal faults, but should return the unit for service to Grant Instruments' Service department or
their distributor in other countries.
Before starting this procedure set power and shaking switches OFF.
Symptom Possible Cause Action required
Unit does not operate
Unit not switched on
Switch on
Unit not plugged into power
supply
Plug in, switch on
Power supply failure
Check that other electrical appliances
on the same circuit are working
Fuse blown in unit or in plug (UK
units only)
Check and replace - see 7.3.1.
Alarm lamp on
Overtemperature cut-out has
operated
Reset the cut-out and check the
settings as described in 3.1.4.
If the cut-out operates again or cannot
be reset, have the unit checked by a
competent person
Temperature does not
rise when expected
Set temperature is lower than
liquid temperature
Check set temperature
Set temperature is too close to
ambient
Raise set temperature, or use cooler
Temperature control circuit fault
Have unit checked by a competent
person
Temperature continues
to rise when not
expected
OR
heater lamp on
Set temperature is higher than
liquid temperature
Temperature control circuit fault Check setting
Have unit checked by a competent
person
Trolley not shaking -
shaking display zero
Shaking not switched on
Switch on
Trolley not shaking -
speed display not zero
Incorrectly fitted trolley
Check fitting of trolley
Speed too high
Reduce speed
No display or speed
incorrect
Speed control circuit fault
Have unit checked by a competent
person
Speed reduces Trolley has scaled up Immerse in descaler, or clean - see 7.1