Air Flow Shutting Down

Good day . i have another issue to my 8890. after replacing the fused silica in transfer line. tha air flow in FID is suddenly shutting down. then i try the detector diagnostic in the system it said test failed and need to replace the jet.

after replacing the jet the air flow is still shuting down with hydrogen while igniting. 

hoping someone response regarding to my issues. thanks in advance. 

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