Chapter 51 Troubleshooting; The Sys Or Pwr Led Does Not Turn On; The Alm Led Is On; Table 81 Sys Led Troubleshooting - ZyXEL Communications IES-1248-51 User Manual

This chapter covers potential problems and possible remedies. After each problem description,
some steps are provided to help you to diagnose and solve the problem.

51.1 The SYS or PWR LED Does Not Turn On

The SYS/PWR LED does not turn on.

Table 81 SYS LED Troubleshooting

STEP
1
2
3

51.2 The ALM LED Is On

The ALM (alarm) LED lights when the IES-1248-51 is overheated, the fans are not working
properly, the voltage readings are outside the tolerance levels or an alarm has been detected on
the ALARM input pins.

Table 82 ALM LED Troubleshooting

STEP
1
2
3
4

Chapter 51 Troubleshooting

CORRECTIVE ACTION
Make sure the power wires are properly connected to the power supply and the power
supply is operating normally. Make sure you are using the correct power source (see
Appendix B on page 373).
Make sure the power wires are connected properly.
The LED itself or the unit may be faulty; contact your vendor.
CORRECTIVE ACTION
Use the statistics monitor command to verify the cause of the alarm. See step 2 if the unit
is overheated, step 3 if the problem is with the fans and step 4 if the voltages are out of
the allowed ranges.
Ensure that the IES-1248-51 is installed in a well-ventilated area and that normal
operation of the fans is not inhibited. Keep the bottom, top and all sides clear of
obstructions and away from the exhaust of other equipment.
Make sure you can feel and/or hear the fans working - working fans emit a low buzz and
blow air.
If the voltage levels are outside the allowed range, take a screen shot of the statistics
monitor command display and contact your vendor.
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