. FAULT MESSAGES AND TROUBLESHOOTING
Graf UK Ltd
6
FAULT MESSAGES AND TROUBLESHOOTING
Technical problems of system operation (failure of a unit) are visually displayed.
6.1 System Behaviour after switching o the Power Supply
If the system is disconnected from the mains (e.g. power failure), the control program and the counted operating hours
are retained due to the memory of the control system. The red LED will light up. When the system is supplied with power
again, it will self-start.
NOTE: If the system is disconnected from the mains for more than 24 hours, cleaning of the existing wastewater is not or
is only possible to a very limited extent.
6.2 Fault Message in the Display
Faults are shown as text or as numbered codes on the liquid crystal display. The operating control lamp then lights up
red.
The numbered fault codes are explained below:
A. Power failure (system is de-energised)
B. Power returned (system is supplied with power again)
C. Compressor has overcurrent
D. Compressor power supply too low
E. Manual operation
The displays no. 2 (power returned) and no. 5 (manual mode) are not faults in the proper sense. These are only registered
as fault messages for better time limitations of any faults that occur and for monitoring manual activities on the control
system.
Table 2: Fault Causes and Troubleshooting
Display Possible cause Remedy
Mains failure
No display, no light
• Power failure
• System turned o
• There is no voltage
at the control cabinet
• Check the power supply to the system and to the control system
• Turn system back on
• Check supply to the control cabinet
• Wait for resumption of power supply
No display, light is green • Turn system o and back on again after 10 seconds
Mains returned • Power available
again
Set the clock • Internal clock/date
not set
• Set date and time via menu item
Compressor
**overcurrent**
• Short-circuit • Check supply to the control cabinet
Compressor **current
too low**
• Compressor does not
work / is not
receiving power
• Check the compressor in manual mode
Manual operation • System was
activated manually
in manual mode
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