Chapter 7

7.4.6Summary 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

If the unit is clearly working

Proceed to next step.

 

unit still working?

normally then the Status LED

 

 

 

itself is probably at fault. Call a

 

 

 

Service Engineer.

 

 

 

 

 

2

Check Power Source.

The problem lies within the unit

The problem lies with the power

 

Connect a known-working

or power cable. Proceed to next

source. Check building circuit

 

piece of equipment to the

step.

breakers, fuse boxes, etc. If

 

power source outlet. Does it

 

problem persists, contact the

 

work?

 

electricity supplier.

 

 

 

 

3

Check Power Cable and

The problem lies within the unit.

The problem lies with either the

 

Fuse. Unplug the power

Proceed to next step.

cable itself, or with the fuse in

 

connector from the unit and

 

the plug. Replace the fuse or try

 

try it in another piece of

 

to substitute another cable.

 

equipment. Does it work?

 

 

 

 

 

 

4

Check PSU Module(s) and

Replace the fuse with one of

Possible problem with the PSU

 

Fuse(s). Ensure the power

the correct type and rating. If

module. Call a Service

 

connector is unplugged.

the PSU still does not work,

Engineer.

 

Remove the fuse from the

unplug the power cable and call

 

 

rear panel connector and

a Service Engineer.

 

 

inspect it. Has the fuse

 

 

 

blown?

 

 

 

 

 

 

7.4.7Fan(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.

7-8

EN/LZT 790 0005 R1A