The sewer is blocked. What should I do if I don't let it be repaired downstairs?

Legal analysis: try to communicate with neighbors, timely repair, notify the residential property, and ask the property management personnel to negotiate and communicate. According to the adjacent relationship, the residents downstairs should provide necessary convenience for the residents upstairs to repair the sewer.

Legal basis: Article 290 of the Civil Law of People's Republic of China (PRC) stipulates that the owner of a property shall provide necessary convenience for the neighboring owners to use water and drain water. The utilization of natural running water should be reasonably distributed among the adjacent owners of real estate. The discharge of natural running water should respect the natural flow direction.