Sink Not Draining But Pipes Clear

Quick answer

If your sink won't drain but the pipes are clear, check the P-trap and air vent. Use a plunger or auger to clear minor clogs. Ensure the drain stopper is open and the overflow hole is clear.

Confirm the symptom

• Water drains slowly or not at all
• Pipes are clear when checked
• No obvious hair or debris in the drain
• Multiple sinks may have similar issues
• Drain emits gurgling sounds

Tools and prep

• Rubber plunger
• Plumber's auger or snake
• Bucket or container
• Adjustable wrench
• Flashlight
• Turn off water supply to the sink
• Protect hands with gloves

Step-by-step troubleshooting

1. Check the P-Trap
   Do: Place a bucket under the sink and remove the P-trap slip nut.
   Observe: Look for debris or clogs in the P-trap.
   Means: A clogged P-trap can prevent proper drainage.
   Next: If clogged, clear it with a brush or plunger.
2. Use a Plunger
   Do: Fill the sink with enough water to cover the rubber cup of the plunger.
   Observe: Watch for water level changes during plunging.
   Means: A successful plunge will push the clog through.
   Next: If no improvement, try a plumber's auger.
3. Inspect the Drain Stopper
   Do: Remove the drain stopper and check for obstructions.
   Observe: Look for hair, debris, or a stuck mechanism.
   Means: A blocked or stuck stopper can prevent drainage.
   Next: Clean the stopper and ensure it moves freely.
4. Check the Overflow Hole
   Do: Look for the overflow hole near the top of the sink.
   Observe: Check for blockages or debris in the overflow hole.
   Means: A clogged overflow hole can cause drainage issues.
   Next: Clear the overflow hole with a wire or small brush.
5. Test the Vent Pipe
   Do: Check the vent pipe on the roof for blockages.
   Observe: Look for leaves, nests, or debris in the vent pipe.
   Means: A blocked vent pipe can cause slow drainage.
   Next: Clear the vent pipe if necessary.
6. Use a Plumber's Auger
   Do: Insert the auger into the drain and push it through the pipe.
   Observe: Feel for resistance or clogs as you push the auger.
   Means: The auger can break up or remove deeper clogs.
   Next: If the auger doesn't help, consider professional help.

Common causes

Parts matching

Common parts needed to fix a sink not draining but pipes clear:

• P-trap cleaning brush
• Drain stopper
• Plumber's auger or snake
• Wire or small brush for overflow hole
• Vent pipe cleaning kit

Purchase parts that match your sink's make and model for compatibility.

When to call a professional

• Clogs persist after using a plunger and auger
• Multiple drains are affected simultaneously
• You suspect a main sewer line clog
• Vent pipe cleaning is required but you're uncomfortable with roof work
• Drainage issues worsen over time

FAQ

Related guides

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