PSD 1 Purge Flow Reduced Error

I am attempting to run a headspace GC method (GC 8890)and I have set all front inlet SS parameters as per an in-house method. Helium is the set carrier gas. When I go to run a sequence on MassHunter, the error stating PSD 1 Purge Flow Reduced appears. Once dismissed all inlet parameters return to the desired setpoints. How can I stop the purge flow from decreasing as soon as I attempt to inject a sample? 

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