My vacuum pump blows when I plug it in on both sides

My vacuum pump was working well. Not long ago it started to blow so I can’t plant any more seeds. I tried to connect the hose to the other side of the pump but this does not change anything. Does anyone have an idea. Thank you in advance.

Did you try to clean the pump like described Here? Use the search function of the forum, there have been multiple reports of similar behaviour and possible fixes.

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