93-520-20 Issue 3.3 Page 55 of 60 CirrusPro Engineer’s Manual
14 Unit Cold Fault
The unit internal temperature has been lower than 1°C for 8 hours. The water could start to freeze.
May also get water fill faults as unit too cold to fill.
15 Unit Disabled
The unit has been shut down via a monitored input. See Section 3.2.12.
16 Expansion Board Fault
A communication problem to expansion PCB has been detected. Check ribbon cable connection and
power to Expansion PCB. Replace if necessary
17 External Fault
A monitored input set up for External Fault Monitoring has detected a fault. See Section 3.2.12.
Check the external equipment and wiring.
18 Battery Fault
A monitored input set up for External Battery Fault has detected a fault. See Section 3.2.12.
Check the power supply equipment and wiring.
19 Mains Fault
A monitored input set up for Mains Fault has detected a fault. See Section 3.2.12.
Check the power supply equipment and wiring.
20 Sample Blocked
The unit has detected that the cloud chamber sample route is blocked. This means that the unit is not
receiving a sample. Remove the sampling pipe from the manifold, if the fault clears the fault is in the
manifold, otherwise the cloud chamber or sample pipe is at fault. Check the sample pipe, manifold or
cloud chamber and replace as necessary.
21 Purge Blocked
The unit has detected that the purge path is blocked. This means that the unit is not purging the unit
correctly. Remove the purge pipe from the manifold, if the fault clears the fault is in the manifold,
otherwise the cloud chamber or purge pipe is at fault. Check the purge pipe, manifold or cloud
chamber and replace as necessary.
22 Pipe Scan Disabled
The Pipe Hold function that forces a scanning unit to sample from the selected pipe has been used.
Units left in this state will show the fault Pipe Scan Disabled. See Section 3.2.8 to enable the pipe
scan.
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