Why is my dishwasher not draining

Dishwasher won't drain

Why is my dishwasher not draining

If water is still on the bottom of the dishwasher when the cycle ends, here are some things to check.

A clog
A clogged sink drain won’t permit water to drain from the dishwasher. If there’s no buildup, try pushing the Cancel button; most dishwashers start the drain pump after the Cancel button is pushed.

If the kitchen sink drain is clear, take a look at the drain hose for clog. On some dishwashers, water goes to the drain pump through the upper sump assembly. A clog in the upper pump assembly can stop water from getting to the drain pump. Look at the upper sump assembly for a clog and get rid of any debris that prevents drain water flow.

Most dishwashers have a chopper blade that cuts up debris as the circulation pump operates. The chopper blade sometimes can’t break up large debris and some items such as labels and glass. When the chopper blade area gets filled with debris, water may not get to the drain pump so the dishwasher won’t drain out the water. Check the chopper blade area and clear any little pieces of garbage from that area of the sump.

A malfunctioning check valve
The drain hose on many dishwashers also includes a check valve that stops water from pushing into the dishwasher sump through the drain hose. You may notice the check valve in the upper sump assembly or next to the chopper blade assembly.

If the check valve is damaged, water may initially drain out of the dishwasher while the drain pump runs but then flow back into the dishwasher after the drain pump stops. Examine the check valve and replace it if it’s damaged.

A failed pump
A failed drain pump can stop the dishwasher from draining. If the drain pump doesn’t operate or doesn’t pump out water when activated, replace the drain pump.

Some dishwashers use a similar pump to circulate water through the spray arms and drain the dishwasher. The pump runs one way to move water through the spray arms and the other way to drain the water. If the pump doesn’t start in the drain direction when beginning, replace the pump assembly.

A bad control or timer
If the timer or electronic control doesn’t start the drain pump during the drain portion of the cycle, replace the control device.