Grant GR150 Manual De Operación página 25

4. Fault diagnosis
Symptom
Unit does not operate
No Display
Display shows Open
Display shows Shrt
Alarm light on
(Display shows Cut)
Temperature does not
rise when expected
Temperature continues
to rise when not
expected
Stirrer motor does not
rotate
17091 Version 12 - October 2009 75T
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Possible Cause
Unit not switched on
Unit not plugged into power
supply
Fuse blown in the unit or, for UK
units, in the plug
Electrical power supply failure
Probe open circuit
Probe short circuit
Overtemperature cut-out has
operated
Low liquid level, float switch has
operated
Navigation control is lower than
liquid temperature
Navigation control is too close to
ambient
Temperature control circuit fault
Navigation control is higher than
liquid temperature
Temperature control circuit fault
Stirrer or propeller obstructed
Pump obstructed
If stirrer motor shaft rotates
freely, then motor thermal fuse
may have blown
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Action Required
Switch on
Plug in, switch on
Check and replace
Check that other electrical
appliances on same circuit
are working.
Have unit checked by
competent person
Have unit checked by
competent person
Reset cut-out as described in
3.1.6
Top up liquid
Check navigation control
Raise the navigation control or
fit accessory cooling
Have unit check by a
competent person
Check navigation control
Have unit checked by a
competent person
Clear obstruction
Clear obstruction
Have unit checked by a
competent person
GR150, GP200
Operating Manual