Back inlet flow shutdown on GC 6890 plus.

Having the above error after installing the above mentioned GC. The GC is not a new one. It has two SSL inlets and two ECD detectors. I tried cleaning the inlet valve as suggested in a post, no leak any where. The temperature for the inlet is set at 250, the pressure at 20, but keep flatuating, the total flow is 0. The total flow comes and goes at 2798. Any assistance in resolving the issue. Thanks in advance.

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