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Re: the dishwasher will buzz about 20 minutes into the...
Is the buzz coming from the door? if so chech soap dispenser.If coming from underneath chech drain pump or wash motor.hope this helps but i dont know what brand or model you have,otherwise you can let me know.
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Is it on a dedicated circut? A dishwasher needs to have a 12Ga two conductor with ground line that is dedicated to ONLY the dishwasher and possibly share with the garbage disposal.
Also, it should be on a 20 Amp breaker.
There is a small motor that advances the program on simpler types of machine. This is a mains-motor that needs a run capacitor to work. If this small capacitor is defective, it will cause the motor to buzz instead of rotating. If you are able to locate it and solder - in an identical component, it will likely solve the problem.
See if you can identify which motor is at fault to check the capacitor on it. These are cheap components - $1 or so.
Try cutting the breaker off for 5 min, This will reset the control. The issue is in order for a dishwasher to clean the dishes properly the water in the dishwasher needs to be at least 120 deg f. If its not the dishwasher keeps adding more time with the heater on to try to achieve this temp. The dishwasher only uses about 1 gallon of water per fill so if the water heater is a ways away or the temp is not hot enough, the water temp in the dishwasher will not reach 120.