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Chapter 7
7.4.6 Summary Status LED Unlit
If the Summary Status LED is unlit, fault-find the problem as detailed in Table 7.2.
Table 7.2 Summary Status LED Unlit Fault-finding
Step Action If Result of Action is Yes… If Result of Action is No…
1
Check Status LED. Is the
unit still working?
If the unit is clearly working
normally then the Status LED
itself is probably at fault. Call a
Service Engineer.
Proceed to next step.
2
Check Power Source.
Connect a known-working
piece of equipment to the
power source outlet. Does it
work?
The problem lies within the unit
or power cable. Proceed to next
step.
The problem lies with the power
source. Check building circuit
breakers, fuse boxes, etc. If
problem persists, contact the
electricity supplier.
3
Check Power Cable and
Fuse. Unplug the power
connector from the unit and
try it in another piece of
equipment. Does it work?
The problem lies within the unit.
Proceed to next step.
The problem lies with either the
cable itself, or with the fuse in
the plug. Replace the fuse or try
to substitute another cable.
4
Check PSU Module(s) and
Fuse(s). Ensure the power
connector is unplugged.
Remove the fuse from the
rear panel connector and
inspect it. Has the fuse
blown?
Replace the fuse with one of
the correct type and rating. If
the PSU still does not work,
unplug the power cable and call
a Service Engineer.
Possible problem with the PSU
module. Call a Service
Engineer.
7.4.7 Fan(s) Not Working/Overheating
The unit is fitted with fans, all of which run continuously. The unit contains a
temperature sensor that will highlight if there is a cooling problem. In the event of
overheating problems, refer to Table 7.3.
Note: Failure to ensure a free air-flow around the unit may cause overheating.
This condition is detected by a temperature sensor; it may be used to trigger
an automatic alarm.
EN/LZT 790 0005 R1A
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