Chapter 4: Troubleshooting
LaserSense Nano Aspirating Smoke Detector Installers Handbook 35
Problem Solution/Corrective Action
Flow fault errors These occur when the airflow rate into the detector exceeds the
preprogrammed parameters. As the detector “learns” the flow setup from
the initial installation, this usually means that there has been some change
in conditions. A Flow High fault may indicate that a sampling pipe is
damaged, and a Flow Low fault may indicate that the pipe has been
blocked, e.g., by nearby building operations.
If the detector input is sampled from one area and the exhaust is in another
area with different pressure (e.g., the detector is in a roof space and
sampling from an enclosed room), this may lead to flow faults. In this case,
it would be necessary to lead a pipe from the exhaust to the protected area
to ensure nominal flow.
Low Flow error
message
Check that the pipe is not blocked.
If the pipe is unused, check that the flow sensor for this pipe has been
disabled.
Check that the low flow fault threshold is not set too high.
In the case of intermittent fault indications, try increasing the flow fault
delay time.
High Flow error
message
Check that the pipe is seated in the inlet and is not broken or cracked.
Check that installed pipework is fitted with endcaps. PipeCAD pipe
modeling software prompts for the use of appropriate endcaps. Open bore
pipes are not recommended.
Check that the high flow fault threshold is not set too low.
In the case of intermittent fault indications, try increasing the flow fault
delay time.
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