Sounds like a bad heating element, or bad door switch, or bad heater relay. You need to buy a multi-meter if you don't have one to troubleshoot which component is bad. And yes you can fix this. Also make sure you have hot water going to the dishwasher.
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How long does it stay in the wash cycle? Indefinitely? Does the display continuously show "WASH"?. If it stays in the wash cycle indefinitely (i.e. continuously shows "WASH" for significantly beyond approx. 3 minutes), it's probably a control board malfunction. If it continues to wash after the "WASH" indicator goes out, it could be a shorted wash motor relay on the relay board or a fauly control board.
If the internal rinse water booster heater doesn't reach it's programmed setpoint temperature in time, the dishwasher will run an extended wash cycle to give the booster heater more time to finish heating the rinse water. If this is what's happening, the wash cycle would last approximately 3 minutes, then it would rinse regardless of whether the booster heater has finished heating or not.
The booster temperature thermistor may be bad, giving a false booster temperature reading, causing an extended wash cycle as described above. The booster heater elements or contactor may be bad, preventing the booster heater from heating and reaching proper temperature, also causing the same extended wash cycle to give the booster more time to heat.
This may sound strange but that is a normal cycle time for today's dishwashers. They use much less water and the water is 'recycled' within the filtration system in the pump.
By reusing and filtering this water they save on heating energy and water consumption. The motors are not as powerful so they use less power even when running longer. Many machines will alternate the wash between the upper and lower arms, this type uses much less water and energy but again the trade off is long cycle times.
If you were to select a heavy or pots and pan cycle with hi temperature wash and a sani rinse your times can be up to 4 hours in some machines today.
The reason behind these savings are mostly due to the energy standards that the appliance manufactures have to abide by today.
I know this may not have been what you wanted to hear but it is how they work today.
The water temp thermostat is to blame or the water is not heating.Basically what happens is the washer fills with cold water and starts to wash and heat at the same time.Once the water reaches a certain temperature it moves onto the next stage of the wash program.If the water is not heating or the thermostat is not working the programmer wont get the signal to move on.Hope this helps.
i would guess that you are having a problem with the optical sensor inside the pump housing. it is suppose to sense when the water is clean or dirty and allow the unit to continue washing or advance to the next cycle. i have seen these test good but be just out of calibration enough to cause long run times. you can try to change it yourself or have the service company try that instead of a new board and panel.
have you ever seen green led "Clean" light flashing? before or about the same time the buzzing sound started? and if so that would indicate that the control senses a fault in the temperature rise during the heating cycle and that the electronic control could be reset by initiating a service diagnostic cycle.(which is what you were trying to do) pls reread your manual there are times during that sequence that some buttons have to be pushed at the same time and within a certain amount of time..possible that your machine also has a bad timer which would give you a buzzing noise..if thats the case I would recommend replacing the cpu or control board..or the machin all together..The Kenmore Ultra Wash Quiet Guard name is sears but whirpool has the contract to produce all "kenmore products.hope that helps.
It is very common that high eficiency, low water using dishwashers take longer to finish all cycles. The best way to "hurry" the washing is to make sure that the water heater is providing hot water of at least 120 degrees. But no hotter then 140 degrees.
If the dishwasher runs even longer, check to see is the dishwasher is actually connected to the cold water line. This dishwasher can be run from cold water but the water heating phase in the cycles will add much time ti the entire cycle.
This unit has a sensor that detects the detects the water clarity towards the end of the wash cycle. Rinsing the dishes may speed the load a little, but encourage not to go crazy on the rinsing because the dishwasher actually counts on the food particles to help clean the dishes.
Also, note that the final (third) blinking light means drying. You can simply open the door anytime after the final draining and power off the dishwasher, allowing the hot dishes to air dry.
Hope this helps. Please resply with your findings. Thanks!