SystemAir HHFlex C, Operating Instructions Manual, Page: 39 / 47

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6 DIAGNOSTICS & TROUBLESHOOTING
6.1 General
The HHFlex control system has many fault tracing aid functions. The web interface and its various menus give access to
all unit operating conditions. If an operating fault is detected, an alarm is activated and an alarm message is displayed in
the alarm list available in the Alarm Status menu.
6.2 Displaying Alarms
6.2.1 E-DSP External display unit
A click on the red button gives direct access to the current alarm(s)
To see the alarm history (latest 40 alarms) go to SERVICE => ALARM LOG
• A flashing red LED shows that there are one or more unacknowledged alarms.
• A fixed red LED shows alarm shows that there are one or more remaining, acknowledged alarms.
6.2.2 Web Panel
Alarms are displayed in de Alarm Status screen
6.3 Alarm report
To permit alarm and alert reporting on LEDs or on the building management system, two outputs are available on the
customer terminal strip:
• A digital 24 VDC output to report alarms
• A digital 24 VDC output to report service alerts
6.4 Resetting Alarms
When the cause of the alarm has been corrected the alarm can be reset, depending on the type, either automatically on
return to normal, or manually when action has been taken on the unit. Alarms can be reset even if the unit is running.
This means that an alarm can be reset without stopping the machine. In the event of a power supply interrupt, the unit
restarts automatically without the need for an external command. However, any faults active when the supply is
interrupted are saved and may in certain cases prevent the unit from restarting.
A manual reset must be run from the push button of the electrical cabinet.