Start the motor so the cable rotates. Slowly feed the cable into the line until you feel resistance.
The blockage may be in the city main, or the pipe is collapsed. Call a plumber with a camera. how to clear main sewer line
To prevent future clogs, it's essential to understand the common causes of clogged main sewer lines: Start the motor so the cable rotates
Many guides assume you have an accessible cleanout (a white pipe with a cap sticking out of the ground). Many older homes do not. If a guide tells you to "remove the cleanout cap" and you don't have one, the advice instantly fails. The alternative is going onto the roof, which is a massive safety risk that few articles emphasize enough. Call a plumber with a camera
The main cleanout is a horizontal pipe with a large removable cap (often square or raised nut). Look for:
It depends entirely on the source.
Flush only human waste and toilet paper. Even items labeled "flushable wipes" do not disintegrate and are a primary cause of sewer line failures.