Dishwasher Won’t Drain: Safe Checks Before Service

What can cause this symptom

• A visible drain hose is kinked, crushed, restricted, or routed incorrectly.
• The connected household sink, drain, air gap, or disposal is restricted where that installation is used.
• A new disposal still has its dishwasher knockout plug where the dishwasher is connected to it.
• Food debris is restricting a user-accessible filter or sump area on a model that documents homeowner cleaning.
• An internal pump, hose, sensor, control, or wiring condition requires service.

Safe checks in order

1. 1

   Record the display and model

   • Photograph any code, message, or flashing-light pattern before clearing it.
   • Confirm the full model number and use its owner and installation manuals.
2. 2

   Stop for leaks or electrical warning signs

   • Stop use if water is leaking near wiring, the junction box, cord, outlet, or another electrical area, or if the breaker repeatedly trips.
   • Do not touch wet electrical equipment; use qualified service.
3. 3

   Observe the sink and visible drain path

   • Check whether the connected sink or household drain is also slow or backing up.
   • Without pulling the dishwasher out, inspect only an accessible hose under the sink for kinks, crushing, or sharp bends.
4. 4

   Check installation-dependent connections only when present

   • If the dishwasher connects to a disposal, air gap, or similar fitting, compare that connection with the exact installation instructions.
   • A disposal knockout plug matters only for a dishwasher connected to that inlet, especially after disposal installation. Never reach into a disposal.
5. 5

   Use only model-documented filter and drain controls

   • Clean a filter, glass trap, or accessible sump area only when the exact manual identifies it as homeowner maintenance; watch for sharp debris.
   • Run Cancel/Drain, Reset, or another drain test only when the exact model instructions support it and no leak or electrical hazard is present.