This article explains you about error code 0xa1d9600 for FPC X offline due to bad voltage.

Error Logs:

Jul 16 01:20:25 ch_connection_shutdown: Destroying the IPC pipe

Jul 16 01:20:25 fpc_disconnect_generic: fpc X slc 0 state Offline cargs 0xa1d9600 clean_shutdown 0, offline_reason=Bad Voltage

Jul 16 01:20:25 -- FPC X, last request 0, state Offline

Jul 16 01:20:25 CHASSISD_IPC_CONNECTION_DROPPED: Dropped IPC connection for FPC X

Jul 16 01:20:43 Power off completed for Fru slot X Fru type FRU_FPC

Jul 16 01:20:49 CHASSISD_FRU_NMI_RESTART: fru_nmi_timer: Restart FPC 2 due to NMI timeout

Jul 16 01:20:59 FPC X offlined for reason Bad Voltage, not powering up

Please attempt to bring FPC X online by restart it via the CLI.

If the issue persists and the FPC does not power up after the restart, contact Support to initiate a replacement of the FPC.