Panel PC 2100 RUN LED switches OFF automatically

Hi all, I have a panel PC 2100. RUN LED (GREEN) of this panel PC switches OFF automatically randomly. Can any one guide me, how to resolve issue or debug hardware? Thannks in advance.

The RUN led reports the state of Automation Runtime running on the system.
Automation Help: APC2100 LED status indicators

If you are not using Automation Runtime you can ignore it. If you are using Automation Runtime I would suggest trying to read the Logger for any additional information.

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Hi. Mr. Tommi.
Thanks for reply. Local B&R team has confirmed problem with controller.
I have following query.
Can I replace faulty PPC 2100, 5AP1120.0702-00 with 5W2A0000030607-001, (option 5ACCIF01.FPLK-000, 2 x POWERLINK ) installed.

With PPC 2100, 5AP1120.0702-00 with 5W2A000003008-000. After installing option 5ACCIF01.FPLK-000, 2 x POWERLINK from faulty controller.

The POWERLINK option board removal from faulty PPC & installation on new one will be done by local B&R team.

Please revert. Thanks & BR