Replace a PA-5410, PA-5420, and PA-5430 Fan Assembly

Learn how to replace a failed fan assembly in the PA-5410, PA-5420, and PA-5430 firewalls.
The PA-5410, PA-5420, and PA-5430 have three dual-rotor, single fan assemblies on its rear side. Each single fan assembly can be individually removed and replaced. When a fan is functioning as expected, the LED on the fan assembly will be green. If a fan fails, the fault LED on the fan assembly will turn red. If this occurs, replace the fan immediately to avoid service interruption. If two or more fans fail, the firewall shuts down.
You can replace a failed fan tray while the firewall is powered on; however, you must use the CLI to view the non-failed fan speeds to assess how much time you have before the thermal protection circuit automatically shuts down the firewall. Issue the following command to check the speed of the fans that you are not replacing:
admin@PA-5420>
show system environmentals fans
If the non-failed fans are operating at less than 11,000 RPM, there is no absolute time limit to replace the fan assembly.
If the non-failed fans are operating at 11,000 RPM or higher, there is a time limit of 120 seconds starting when the fan assembly is removed to replace it before the thermal protection circuit automatically powers down the firewall.
  1. Put the provided ESD wrist strap on your wrist ensuring that the metal contact is touching your skin. Then attach (snap) one end of the ground cable to the wrist strap and remove the alligator clip from the banana clip on the other end of the ESD grounding cable. Plug the banana clip end into the ESD port located on the rear of the appliance before handling ESD sensitive hardware. For details on the ESD port location, see PA-5400 Series Back Panel.
    When removing a fan assembly, first pull the fan assembly out about 1 inch (2.5cm) and wait 10 seconds. This allows enough time for the working fans to stop spinning.
  2. Remove the replacement fan assembly from the packaging and have it ready.
  3. Identify the failed fan assembly by checking the fault LEDs of each fan. In the event of a failure, the LED on the fan assembly will be red.
  4. Loosen the captive screw holding the fan assembly in place.
  5. While gripping the fan assembly handle, gently pull the fan assembly out of its slot.
  6. Install the replacement fan by sliding it into the vacant fan slot. Tighten the captive screw by turning it clockwise until it is secure. Ensure that the fan assembly is secure by gently pulling on the handle.
  7. Verify that the new fan assembly is operational by noting the status of the fan assembly LED and the fan LED on the front panel. The individual fan assembly LED shows green if it is functioning as expected. Similarly, the fan LED on the MPC also shows green if all fans are working as expected. You can also view the status of the fan trays by entering the following command:
    admin@PA-5420>
    show system environmentals fan-tray
    To view the status of each fan on a fan tray, run the following command:
    admin@PA-5420>
    show system environmentals fans

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