How to Detect a Bad Power Supply Unit or Bad Power Adapter

How to Detect a Bad Power Supply Unit or Bad Power Adapter

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Created On 07/09/19 20:59 PM - Last Modified 03/29/23 22:22 PM


Objective


The steps below will help determine if the PS or PWR is bad in the event that your device does not power on, or you receive a System Log alert for "Alarm on Power Supply".

Environment


  • Palo Alto Firewall
  • Panorama Appliance


Procedure


Scenario 1: Device does not power on:

  1. Check the Power Supply (PS) or Power Adapter (PWR) LED status and the device Power LED status. If PS/PWR LED is not green then proceed to the next steps in order. If the PS/PWR LED light glows green after completing one of the steps below then no need to move to the following step; Instead, consider that the problem is solved and continue monitoring your device.
  2. Check if the Power cable is connected.
  3. Check if the Power cable is secured.
  4. Plug into a different power source.
  5. Replace power cord.
  6. Reseat the Power Supply.
  7. If you have eliminated that the problem is the power source or a loose/unplugged power cable then proceed to Submitting an RMA Request section below


Scenario 2: Device is on but receive System Log for "Alarm on Power Supply":

  1. Check if the 'Alarm' category is set to 'True' in the CLI:
> show system environmentals
----Power Supplies----
Slot   Description                         Alarm    Inserted
 S1    Power Supply #1 (left)              False    True
 S1    Power Supply #2 (right)             True     True
  1. If Alarm is True, perform the steps below to the affected Power Supply (in the example here it would be the Power Supply on your right hand side while facing the back panel of the firewall):

    1. Check the Power Supply (PS) or Power Adapter (PWR) LED status. If PS/PWR LED is not green then proceed to the next steps in order. If the PS/PWR LED light glows green and the show system environmentals is no more showing True under Alarm column after completing one of the steps below then no need to move to the following step; Instead, consider that the problem is solved and continue monitoring your device.
    2. Check if the Power cable is connected.
    3. Check if the Power cable is secured.
    4. Plug into a different power source.
    5. Replace power cord.
    6. Reseat the Power Supply.
    7. If possible, during a maintenance window, swap the working and non-working Power Supplies (this will require to shutdown the device make the swap then turn on the device).
  2. If Alarm is still True check logs below from CLI
  3. Check the system logs for further indication of any failures detected by the system
> show log system 
critical hw             ps-fail 0  Alarm on Power Supply #2 (right)
critical general        general 0  Chassis Master Alarm: Cleared
  1. Check the ehmon.log or chasd.log for alarms for further indication
> less mp-log ehmon.log
Sensor Alarm [True ]: Power Supply #2 (right) = False
Sensor Alarm [False]: Power Supply #2 (right) = True
POWERSUPPLY: Power Supply #2 (right) failure
> less mp-log chasd.log
Chassis Master Alarm: Power Supply
Chassis Master Alarm: Power Supply
  1. If a faulty PS or PWR has been identified, then a case needs to be opened with support for RMA processing. See KB below.


Additional Information


Checking the Power Supply LED's on the appliance can also provide helpful information. See Links below for LED status for various devices.

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