If water won't clear it, the clog is likely a solid mass (a compacted nest, a dead animal, or ice).
To prevent clogged sewer vents in the future: how to unclog sewer vent
Unclogging a sewer vent is a for the average homeowner, provided the roof is accessible safely. The diagnostic phase is straightforward, and the tools are inexpensive. If water won't clear it, the clog is
Most vent pipes extend through the roof, meaning you will need a ladder and basic safety gear to address the issue. 1. Gather Your Tools How to Tell if Your Plumbing Vent is Clogged Most vent pipes extend through the roof, meaning
On the roof, locate the vent pipe — a 3–4 inch diameter cast iron or PVC pipe sticking up like a short chimney. Shine your light down. See daylight? Probably clear. See darkness, leaves, or a nest? Bingo.
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not feel suction, there is a blockage in the line. Remove Visible Debris Check the top of the vent for obvious obstructions like bird nests, leaves, or dead animals. Use a hook or reach in to manually extract what you can. Use a Plumber's Snake (Auger) Feed a long plumber’s snake or electrician's fish tape into the vent stack. Rotate and push the snake until you feel the obstruction break apart. This is the most effective way to clear compacted organic matter. Flush with a Garden Hose Once the clog is loosened, run water from a garden hose down the vent to wash remaining debris into the main sewer line. Pro Tip