MP-AES 4210 has an error on gas box fault and nebulizer flow became too high

First thing to try is to power cycle the instrument and reboot the PC.  While PC is rebooting, check the gas line connections of the nebulizer.  Both at the instrument and at the neb.  It is showing zero back pressure with really high flow which might indicate it is leaking around one of those fittings.  After the reboot, try the nebulizer test again.  If it still shows high flow and no back pressure, contact your local Agilent office for service.  

First thing to try is to power cycle the instrument and reboot the PC.  While PC is rebooting, check the gas line connections of the nebulizer.  Both at the instrument and at the neb.  It is showing zero back pressure with really high flow which might indicate it is leaking around one of those fittings.  After the reboot, try the nebulizer test again.  If it still shows high flow and no back pressure, contact your local Agilent office for service.  

thank you for your reply, we did as you recommendations on all steps including our local Agilent agent offices they recommended replacing the gas box. w have checked it and we find that gas does not pass through the valve shown on the picture