The rack controller displays the “TOO HIGH LOAD" message on the screen and prevents the turbo pump from turning on.

Hello,
Our laboratory has a TwisTorr 84 FS Pump, model: X3502-64001, and a TwisTorr 84 FS AG Rack Controller, model: X3508-64001.
 
The rack controller displays the “TOO HIGH LOAD" message on the screen and prevents the turbo pump from turning on.
 
What does this mean? What can we do to fix this problem?
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