Bathroom Sink Won’t Drain (No Clog) – Common Causes and Solutions
When your bathroom sink won’t drain, it can be a frustrating and inconvenient problem. While clogs are often the culprit, there are also several other reasons why your sink may not be draining properly, even if there is no visible clog.
1. Blocked P-Trap
The P-trap is the U-shaped pipe located directly under the sink. It is designed to trap water and prevent sewer gases from entering the home. However, hair, soap scum, and other debris can accumulate in the P-trap over time and cause a blockage.
To clean the P-trap, you will need to remove it from the sink. Place a bucket under the P-trap to catch any water that may spill out. Use a wrench to loosen the nuts that hold the P-trap in place, and then carefully remove the P-trap.
Once the P-trap is removed, you can inspect it for any blockages. Use a flashlight to look inside the pipe and remove any debris that you find. Once the P-trap is clean, reattach it to the sink and tighten the nuts.
2. Clogged Vent Pipe
The vent pipe is a vertical pipe that runs from the sink drain to the roof of the house. It is designed to allow air to enter the drain system and prevent the drains from becoming clogged.
If the vent pipe is clogged, it can create a vacuum in the drain system and prevent water from draining properly. To check if the vent pipe is clogged, go to the roof of the house and look for the vent pipe. If the vent pipe is clogged, you will see debris or ice blocking the opening.
To clean the vent pipe, you can use a wire brush or a wet/dry vacuum to remove any debris. If the vent pipe is frozen, you can use a heat gun or a hair dryer to melt the ice.
3. Slow Drain
If your sink is draining slowly, it is possible that the drain is simply clogged with hair, soap scum, or other debris. To clean the drain, you can use a drain snake or a drain cleaner.
To use a drain snake, insert the snake into the drain and turn the handle clockwise. The snake will rotate and break up any clogs in the drain.
To use a drain cleaner, follow the instructions on the product label. Be sure to wear gloves and eye protection when using drain cleaner.
4. Damaged Drainpipe
If your sink has been draining slowly for a long time, it is possible that the drainpipe is damaged. Drainpipes can become damaged due to corrosion, freezing, or tree roots.
To check if the drainpipe is damaged, you can remove the P-trap and inspect the pipe. If the pipe is damaged, you will need to replace it. Replacing a drainpipe is a job that is best left to a professional plumber.
5. Improperly Installed Sink
If your sink was recently installed and it is not draining properly, it is possible that the sink was not installed properly. When a sink is installed, it is important to ensure that the drainpipe is properly aligned and that there are no leaks.
If you think that your sink may have been installed improperly, you should contact a professional plumber to have it inspected.
Conclusion
If your bathroom sink won’t drain, there are several possible causes. The most common cause is a clogged P-trap or vent pipe. However, it is also possible that the sink is draining slowly due to a damaged drainpipe or improperly installed sink.
If you are unable to clear the clog yourself, you should contact a professional plumber to have the problem diagnosed and repaired.
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