An IERR is a Processor Internal Error. 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 can start this signal.
On the Intel® Server Boards listed at the bottom of this page, a Processor IERR can be confirmed or discarded from the Basic Input Output System (BIOS) Setup Utility under Advanced > Processor Configuration > CPU Retest.
The IERR Filtering Algorithm helps to 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. However, if the problem persists:
- Try to boot up the system with one processor at the time
- Test another processor if possible.
- Remove and reinstall the memory.