Needle-sweet leaking and pressure do not reach 150.

I have infinity o1260 HPLC. I have a problem with the needle seat. When I increase the flow up to 0.5 LmL/min, needle seat leaks and pressure does not go up anymore. Previously I had a sample filtration problem and a needle was clogged. I changed the needle and needle seat and capillaries of the needle seat unite.

is it possible that I have clogged units after needle seat? 
I am worried about it:(

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