Garbage disposal trips the kitchen GFCI outlet only when the dishwasher is draining through it.

Safety warning: Turn off power to both the dishwasher and disposal at the breaker before inspecting.

• Step 1 – Inspect hose and inlet: Check the dishwasher drain hose connection at the disposal for leaks or spray when the dishwasher drains.
• Step 2 – Check for water intrusion: Look for signs of water on or around the disposal motor housing during dishwasher drain. Fix any leaks from the sink flange or hose.
• Step 3 – Verify electrical circuits: Ensure the dishwasher and disposal are wired correctly to the GFCI, with separate neutrals as required by code. Miswiring can cause nuisance trips.
• Step 4 – Isolate appliances: Temporarily disconnect the dishwasher from the disposal and run a drain cycle into a bucket. If the GFCI still trips, the dishwasher may have a ground fault.
• Step 5 – Call a technician if needed: Ground faults in the dishwasher or complex GFCI wiring issues should be handled by a qualified technician or electrician.