The state of valve box on GC is same

Hi

From picture, it looks that one valve is in ON stage and other valve is in OFF stage..

So from GC keypad, press valve then press valve 1 and 2 in ON & OFF stage and check it's going in that stage or not..

If not going, then check actuator and valve..May be rotor of valve is faulty or actuator faulty..

Hope, it's clear to you...

Thank you very much .Can we repair it by ourself? Or need to change some part of valve box?

You have to open valve box then can check actuator n valve..

If have service experience then do otherwise you can get support from your local agilent...