Some manufactures of dishwashers make the claim that their models have a special built-in chopper that can pulverize any food pieces left on the dishes, and safely pump them down the drain. The simple fact is that even solid food particles as small as cooked rice, seeds, strands from celery and other vegetables will often cause problems requiring the dishwasher repairman.
Some of these items can actually bend the tiny chopper, clog the internal filters reducing water flow, jam the pump, and block the jets that spray water and rotate the wash arms. Also, food commonly collects at drain line bottlenecks and check valves preventing the dishwasher from draining properly. Food removal is one of the most common repairs on dishwashers. The good news is that most of these problems can be alleviated by rinsing all food particles off the dishes prior to loading dishwasher. Grease and oil of course, are easily handled by most brands of dishwashers.
Poor cleaning can also result from the input of fresh water that is not hot enough.
Most manufactures require that the water entering the dishwasher should be at least 120 degrees F.(check your owner's manual). To help this you can let your kitchen tap run until it gets hot, just before starting the dishwasher. Also, check your water heater so see if its thermostat is set high enough. This not only helps the dishes get clean, but may also shorten the dishwasher's cycle time because, to get the water hot, the dishwasher will not have to heat the water as long.
Most Dishwashers have a water level sensor that operates as a float. The float is usually located inside the tub, near the front bottom, at the left or right corner. It is a dome shaped cap, about two to three inches in diameter, that bobs up and down with the water. When the water starts to get to a prescribed height, a switch is tripped, and the water fill valve is shut off. Sometimes a piece of cutlery or other objects can get stuck underneath the float, preventing the water fill valve from opening.
If you are finding transparent spots on your dishes, you may have what is known as hard water. This is when your water has a high content of minerals, and a corresponding increase of water tension. Too much water tension causes the water to bead on your dishes instead of running off in sheets. When the beads dry, they leave spots. If you have this problem, check out the 'Jet Dry' website.
Another cause of this problem is using too much soap.
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