Automatic Plumbing Vent Troubleshooting

A sewage smell from a toilet may indicate a blocked plumbing vent.

The automatic plumbing vent equalizes drain system pressure and removes gases from the sewer line. When the plumbing vent is not correctly working, strange smells and sounds may occur. Note that if you are not confident in your ability to troubleshoot the automatic plumbing vent safely, contact a plumbing professional.

Things You'll Need

• Hot water
• Clean cloths

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Instructions

1. Locate the automatic plumbing vent. It is installed in different locations in different houses. Sometimes, a plumbing vent stack, which resembles a pipe sticking up, is located on the roof. Other homes have a plumbing vent extending into the floor near a sink, toilet or other plumbing in a home, commonly in the attic or basement.

2. Examine the plumbing vent for debris or obstructions blocking the vent.

3. Check attic or roof vents for frost obstruction. Clean the frost away by pouring hot water into the vent.

4. Remove obstructions, debris and any other object that may be inhibiting proper vent function.

Tips & Warnings

• Contact a plumbing professional for assistance if the plumbing vent pipe is cracked, separated or if there are stains around the pipe. The plumbing vent or pipe may need replacing.

• Contact a plumbing professional if you cannot find the plumbing vent or cannot easily access or view the roof. Sometimes, the vent is installed in the attic underneath insulation or is otherwise covered.

References

• Check This House, Inc.: Plumbing Vent Problems in Your Home
• Brady Home Inspection: Plumbing Vents