E22
AmazonCommercial
Improper Double-Bowl Drain Configuration / Partial Blockage
Disposal runs but water backs up into the opposite sink bowl in a double-bowl sink.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Improperly installed baffle tee, Clogged cross-over pipe between bowls, High loop missing on dishwasher or disposal branch, Partial blockage in shared trap arm
How to Fix / Troubleshooting
Safety First: Turn OFF power to the disposal. Do not run it while drain piping is disassembled.
- Step 1 – Inspect double-bowl configuration: Under the sink, identify how the two bowls connect to the trap. Ensure a proper baffle tee is used between the disposal and the other bowl.
- Step 2 – Clean cross-over and tee: Remove the cross-over pipe and baffle tee. Clean out any food or grease buildup.
- Step 3 – Verify slope: Ensure horizontal sections slope slightly downward toward the wall drain to prevent backflow.
- Step 4 – Reassemble and test: Reinstall all components with intact washers. Run water and operate the disposal to confirm that water no longer backs up into the other bowl.
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Repair Difficulty
Medium
3/5
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