4–Diagnostics/Troubleshooting
Power-On Self Test Diagnostics
4-6 59265-02 B
Over-Temperature Blink Pattern
An over-temperature blink pattern is five blinks followed by a two-second pause.
The five-blink error pattern indicates that the air temperature inside the switch has
exceeded the failure temperature threshold.
Figure 4-5. Over-Temperature Blink Pattern
If the Heartbeat LED shows the over temperature blink pattern, do the following:
1. Inspect the chassis vents. Are the intake and exhaust vents clear?
Yes—Continue.
No—Remove any debris from fan intake and exhaust if necessary. If
the condition remains, continue.
2. For a model 5802V, inspect the Power Supply Fault LED on both power
supplies. Is the Power Supply Fault LED lit on either power supply?
Yes—Replace the power supply. If the condition remains, continue.
No—Continue.
3. For a model 5802V, observe the air flow direction from both power supplies.
Are they the same?
Yes—Continue.
No—Determine the correct air flow direction for the switch. Replace
the power supply with the incorrect air flow direction with another
having the correct air flow direction. Air flow direction is marked on the
power supply part number label. If the condition remains, continue.
4. Consider the ambient air temperature near the switch and clearance around
the switch. Make necessary corrections. If the condition remains, power
bring down the switch, and then contact your authorized maintenance
provider.
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