My Split/Splitless Inlet on my 6890 Shows Zero Total Flow

I recently replaced the split/splitless inlet to my GC because one of the gas carrier lines had cracked and was leaking.  The GC repeatedly goes into front inlet flow shutdown despite attaining set pressure.  Looking at the software, there is no total flow through the inlet.  To provide more context, my setup samples a gas streak in real-time, so there is a gas-sampling valve between the inlet weldement and EPC module.

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  • Thanks for the suggestions.  My other inlet is actually a purged packed column, so I cannot interchange the EPC.  I was able to disconnect to the carrier gas line and verify 1) the pressure immediately decreased and 2) was unable to reach the setpoint - indicating that the pressure gauge is likely functioning properly.  Additionally, I used a little leak-detecting solution to verify that a large flowrate of gas is coming out of the split vent line, despite the total flow being measured as 0 mL/min.

    Is there anything else I can do, or should I move forward with the assumption my EPC is malfunctioning?

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