emergency stop open

hello to all..
today when i turn on the IRC5 controller, on pendant "instead off guard stop it is emergency stop" and after pressing enabling switch from tech pendant to jog the robot it gives (20202 emergency stop open alarm). 
Led's status on safety board is EPWT led is green rest all are orange or "yellow", 
ES2 led is orange both the emergency switch on the IRC5 Controller and Tech Pendant are connected to ES2, 
ES1 led is complete off
EN led at the strat is off, when i press enabling switch from pendant it turns orange and holds its state despite i released the switch.
AS1,AS2,GS1,GS2 all are orange.
what could be the problem? any help please....


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