MDS 600 Amber alert

Occasional Visitor

MDS 600 Amber alert

i have MDS 600


and it show amber alert in the GSI LED

i checked the fan, the power supply and the temprture 

all work fine

but the amber alert not go


the  7-segment display show: 


error# 01


which mean : SES overall warning 



i replace fans one by one and wait 30 seconds between each replace 

but also not help


please advise us