There could be several reasons why the water in your sink is not coming out when your washer is running. Some common possibilities include:
Clogged drain: The drain pipe that connects your sink to the main sewer line may be clogged with debris, grease, or other materials. This can prevent water from flowing properly and cause backups in your sink.
Shared drain line: If your sink and washer share the same drain line, it's possible that the washer is producing a large volume of water during its cycle, and the drain line may not be able to handle both the sink and washer water simultaneously.
Ventilation issues: Proper drainage requires adequate ventilation in the plumbing system. If there is a blockage or obstruction in the vent pipes, it can create negative pressure, which may prevent water from draining properly.
Faulty plumbing installation: If the plumbing system was not installed correctly, it might lead to improper drainage, causing water to back up in the sink when the washer is running.
Main sewer line issues: There could be problems with the main sewer line, such as blockages or tree root intrusion, causing water to back up into your sink.
To troubleshoot the issue, you can try the following steps:
Check for visible clogs: Inspect your sink drain for any visible clogs and try to remove them using appropriate tools like a plunger or a plumbing snake.
Run water in the sink: Turn on the faucet in your sink and observe if the water drains properly. If it doesn't, the issue might lie with the sink drain itself.
Verify shared drain line: Find out if your sink and washer share the same drain line. If they do, it's possible that the drain is overwhelmed by the washer's water volume.
Check other drains: Check other drains in your house to see if they are affected. If multiple drains are not working correctly, the problem may be in the main sewer line.
Call a plumber: If you can't identify or resolve the issue yourself, it's best to call a licensed plumber. They have the expertise and tools to diagnose and fix plumbing problems effectively.
Remember, plumbing issues can vary based on the specific layout and configuration of your home's plumbing system. Always exercise caution and consider seeking professional assistance if you're unsure about how to proceed.