Question about Dishwashers

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Our dishwasher seems to have stopped working over night. The power button comes on and the unit beeps to acknowledge start, but then there is only a very light hum & the unit does not start. No water comes through the unit and it just hangs at the light hum. We have not turned off any water but just checking if there is a simple solution? Adam Hdw100sst

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Suspect pump.

on start the pump will activate to remove condense water from drying the last load.
if the pump does not start then the next step of adding water to start wash cycle will not happen.

ensure pump is not blocked or obstructed. (see user manual)

if the pump is free but still not working may need replacement


I hope this was useful

Posted on May 23, 2011

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Most dishwashers go through a pumping cycle to evacuate any water remaining from its previous run, before opening the water valve to let in fresh water.

The pump sits just below a screen on the bottom of the inside of the dishwasher.Generally, this pump is located in the far back of the dishwasher. You may need to remove the lower sliding rack to gain access to this part of the dishwasher.

Check to see if something is stuck into or below the screen, which may be stopping the pump from turning. This condition would cause the hum you describe. Use a flashlight to look first.

Be careful as you run your hand over the screen or over the pump impeller to feel for debris, because quite often the problem is that a glass has broken inside the dishwasher and a broken shard of glass is lodged in the screen, poking down into the pump. The first time I encountered this condition, I cut myself on these lodged shards of clear glass because they are nearly invisible in the poor lighting conditions which exist inside the dishwasher. It could also be a straw, bottle cap, or some other type of debris. If the screen is missing, a fork or spoon could be stuck in the pump impeller.

Posted on May 23, 2011

  • Ron Hardy May 31, 2014

    The light hum you hear could be the timer motor inside the door, behind the control knob. It is possible that a gear or electrical contact has broken, corroded, or stripped itself inside of the timer mechanism. While sometimes timers can be rebuilt, it is almost never cost effective. Best to buy a new timer. To tell if the timer is the problem, slowly turning the knob to determine if the pump goes on or off, the water runs in or stops, and whether the soap dispenser activates or opens as you turn the knob all the way around until it passes the drying cycle and goes to off again.

  • Ron Hardy May 31, 2014

    To determine whether the hum is the timer motor or the pump, put your ear to the door near the timer knob. If the pump motor is humming, then you should hear it more distinctly when removing the kick panel below the door on the outside front of the machine. The pump will sound like the hum comes from underneath the dishwasher.

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Posted on Jan 02, 2017

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