So there's water where you don't want it, and it's coming from the dishwasher. Use this troubleshooting guide to determine where the water is overflowing and get the machine running again.
Cracked or Loose Wash Arm Assemblies
If the wash arm is cracked, a stream of water can spray the door seal and cause a leak. Inspect and replace the wash arm if there is a crack. Do not fix the crack with glue as the glue will break down inside the machine. Epoxy will work as long as it can handle the internal run temperatures (120°F - 180°F).
If the wash arm is intact, check that the support screws are tight. Looseness may allow water spray between the wash arm support and the pump housing, and thus another leak.
Faulty Water Inlet Valve
The inlet valves water to enter dishwasher. When clogged or failing, either not enough water will enter the machine for a proper cleaning cycle to run, or continue filling with water until a leak or overflow. If experiencing these issues, the water inlet valve may be at fault and need replacing. Do not attempt cleaning and replacing the valve.
There are many seals on a dishwasher. You can narrow the source of the leak and check the corresponding seals, and replace as necessary.
If water leaks from the door, check the door seal. If the seal looks fine, check the door hinges. Bent hinges will prevent the door from closing and allow water to leak.
If water leaks from the motor area, check the motor shaft seal. On some machines, the entire pump and motor assembly must be replaced.
If water leaks from pump area, inspect the seals for the main tub, float, heating element and blower diffuser.
If water leaks from the drain hoses, check hose clamps or cracks in the hose.
Drain Pump Failure
The pump uses an impeller to force water out of the drain hose. They can fail both electrically and mechanically. If the pump is jammed, remove the blockage. If the impeller is broken, replace it.
A worn drain pump may have a hole, crack, or worn bearings causing a leak. Replace the drain pump in this case.
The pump motor may have died. Use a multimeter set to Ohm (Ω) and check for continuity by placing the probes onto the electrical leads. If the motor tests negative for continuity, it will need to be replaced.
Some models of dishwashers may have separate pumps to drain and circulate the water, so check both pumps. If the pump just hums when it should be running, the pump assembly might need to be replaced.
Incorrect Washing Fluid
Make sure your detergent is intended for dishwashers. Do not use liquid dish soap.