93-520-20 Issue 3.3
Page 53 of 60
CirrusPro Engineer’s Manual
6.0 Fault Finding
Internal diagnostics monitor for faults that may arise during commissioning, service and normal
running.
Network related faults are covered in the previous section.
6.1
Fault List
Faults have been assigned codes that are used to identify the faults. The following is a list of all faults
in Fault Code order:
1 Processor Fault
This is indicated if a problem has been detected with the micro controller or the Read Only Memory
(ROM). This is a serious failure and usually requires a replacement geartray assembly.
2 Corrupt Eeprom
The internal program memory (eeprom) does not pass internal tests. This could be due to an error
during saving data. Re commissioning the unit and saving the settings should clear this error. If the
error persists then replace the geartray assembly.
3 Supply Fault
The unit has detected that the fault output from the charger has activated. It is necessary to look at the
charger to determine the cause of the fault.
4 No water
The unit is out of water.
Check water supply and refill. Force a fill by pressing the hardware reset button. A fill will occur within
2 minutes. Water should seen to be taken from the bottle.
If water is not taken then the water fill path could be blocked or the valve has failed, in which case
replace the cloud chamber.
If water is present and the fault persists after unit has been reset see the Water Fill Fault (Fault Code
8).
5 Chamber Seal
The chamber is tested for ‘leaks’ during the power up tests. This fault does not necessarily stop the
unit functioning, but it must be attended to before complete failure occurs.
Check LED/Photodiode screws/seal. Tighten the six chamber screws slightly and check the thermistor
seal.
If fault persists, replace cloud chamber
6 Vacuum Fault
The unit has detected that the vacuum is insufficient to form a cloud (<5.7psi). Check connections to
the pump, the pump operation and the pipe to sensor on the PCB and from the pump to the cloud
chamber.
Restart the unit to let it recalibrate itself, if it can. At this point the Chamber Seal fault may occur, if so
see Error 5.
Change the pump if required.
