One of the 3U HOST (836E1-R800B) server in our tool start to alarm right after the server start to boot-up. We noticed that the alarm#1's LED is ON (D3) from the backplane turns on. What is the problem?
Disable the fan fail jumper which is on the back plane. There is a jumper on the fan_alert_eni which enables fans on the backplane. Pull the jumper off and it will solve thi sissue.