Flashing Amber is a non-fatal error.
Should be something in the SEL.
Fan error, non redundant PSUs, etc.
Amber LED in front panel starts blinking when all cores are used at the peak.
Is it indicating that CPU is getting hot or what ?
It is possible that the light goes amber if the temperature has exceeded the threshold set for the processor(s).
To better understand what is causing this amber light, I would recommend running our Intel System Information Retrieval Utility to capture the logs of the system and see what is being recorded in the BMC for this.