How to Recover from an IERR for Intel® Server Boards


Product Information & Documentation



What am I seeing?

An IERR is a Processor Internal Error.

Why am I seeing it?

This error is a signal that indicates a processor unrecoverable error or even a non-CPU event, such as a system bus interruption or a memory interruption, can start this signal.

How to fix it.

On the Intel® Server Boards listed at the bottom of this page, you can confirm or discard a Processor IERR from the Basic Input/Output System (BIOS) Setup Utility under Advanced > Processor Configuration > CPU Retest.

The IERR Filtering Algorithm helps you determine if the IERR signal came from a false CPU internal error or from another hardware source. This filtering algorithm helps you prevent unnecessary processor replacements. At the same time, this algorithm helps you to isolate IERR events.

If the IERR returns after the CPU Retest, the IERR signal most likely came from the CPU itself. If you have more than one processor installed, check the System Event Log (SEL) to find out which processor is generating the IERR.

In some cases, a system restart can also eliminate an IERR.

I've tried checking the SEL and doing a system restart with no success. What else can I try?

If the problem persists:

  1. Try to start the system with one processor at a time.
  2. Test another processor if possible.
  3. Remove and reinstall the memory.


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