Disposal runs but water backs up into the sink and drains very slowly, even when the unit is off.

Safety first: Turn OFF power to the disposal before disassembling any plumbing.

• Step 1 – Test without disposal: With the disposal OFF, run water. If it still drains slowly, the blockage is in the plumbing, not the disposal.
• Step 2 – Clean P‑trap: Remove and clean the trap as described in the E06 procedure.
• Step 3 – Snake the line: Use a small drain auger to clear the pipe from the trap to the wall connection.
• Step 4 – Avoid chemicals: Do not use caustic drain cleaners, as they can damage seals and the disposal housing.
• Step 5 – Reassemble and test: Refit all pipes, run plenty of water, and verify that the sink drains freely.