• Code: 818
• Description: Watchdog error
  The bus is being held by another device, or a CPU-device infinite loop has occurred. A module that the watchdog is monitoring has not closed properly at the conclusion of its task, or the module cannot continue processing.
• Causes: • System program defective; switch off/on, or change the controller firmware if the problem cannot be solved • Controller board defective • Controller option malfunction

• Code: 819
• Description: Fatal kernel error
  Due to a control error, a RAM overflow occurred during system processing. One of the following messages was displayed on the operation panel.
• Causes: • System program defective • Controller board defective • Optional board defective • Replace controller firmware

• Code: 820
• Description: Self-Diagnostic Error: CPU
  The central processing unit returned an error during the self-diagnostic test.
• Causes: • Controller board defective • Software defective

• Code: 821
• Description: Self-diagnostic error 2: ASIC
  The ASIC provides the central point for the control of bus arbitration for CPU access, for option bus and SDRAM access, for SDRAM refresh, and for management of the internal bus gate.
• Causes: • ASIC (controller board defective)

• Code: 822
• Description: Self-diagnostic error 3: HDD
• Causes: • HDD defective • HDD harness disconnected, defective • Controller board defective

• Code: 823
• Description: Self-diagnostic Error: NIC
  The network interface board returned an error during the self-diagnostic test.
• Causes: • Network interface board defective • Controller board defective

• Code: 824
• Description: Self-diagnostic error 4: NVRAM
  NVRAM device does not exist, NVRAM device is damaged, NVRAM socket damaged
• Causes: • NVRAM defective • Controller board defective • NVRAM backup battery exhausted • NVRAM socket damaged

• Code: 826
• Description: Self-diagnostic Error: NVRAM/Optional NVRAM
  The NVRAM or optional NVRAM returned an error during the self-diagnostic test.
• Causes: • Make sure NVRAM is seated correctly in its socket • Replace the NVRAM on the controller board