Check the water level, on most dishwashers it should fill to just under the heater element. It should not activate the float switch, this is a safety device only.
If the water level is low, it could be the pump sucks air every once in a while and cavitates. This can sound like grinding.
Could try adding a quart or so of hot water to the unit after it fills to confirm this.
If this is the cause there is a good chance that the filter screen on the intake side of the water valve is partially clogged. Take it apart and clean it. Do not run without a filter screen it stops crud from getting into the valve and holding it open which would result is a kitchen flood. |