Dishwasher does not draw water


If the dishwasher does not draw water, it can have very trivial but also complex causes. The problem is therefore depending on the cause of damage not for every dishwasher owner to fix. After that, we summarized what is possible if the dishwasher does not draw water.

What happens before the water intake

In order to understand which causes can be responsible for the fact that the dishwasher no longer draws any water, it is important to know how it works, especially when starting the program. Inside the dishwasher under the sieve covers is the so-called pump sump. There is always some water there.

If the dishwasher (pump) is pumping out

Most appliances pump this water before they even let in water. So the program often starts with pumping out. Then the water should also enter. Now turn on the dishwasher and start it, should it first try to pump off. If there is no more water in the pump sump, then add water to the dishwasher before starting it.

Exclude faulty solenoid valve (before flushing the dishwasher)

However, some devices do not pump. Instead, the water inlet should start. Instead, if you hear a humming or humming, the solenoid valve at the water entrance could be the cause. However, if you do not hear anything, it will be time to upgrade the dishwasher. You need to get to all hoses.

Angle valve, inlet hose and aquastop

As of today, almost all dishwashers have Aquastop. This is a gray plastic box on the inlet hose of the dishwasher (wall side). Since you do not find a defect in the Aquastop easily, first mount the inlet hose on the flushing side and carry out the bucket test. In doing so, check the flow rate and how much the water flows through the hose. Stop the time.

The bucket test

Within a few seconds, several liters should run into the dishwasher. How much accurate, can be very difficult to say, since the water consumption of the dishwasher can vary considerably according to the year of construction. However, if there is clearly insufficient water, unscrew the inlet hose on the wall side at the angle valve.

Here are several possibilities as errors into consideration:

  • Shut-off valve is defective
  • Sieve is clogged
  • Aquastop has triggered or is defective

If the shut-off valve is in order and the strainer is clean, only Aquastop can be considered. However, there are different systems here (mechanically and electronically triggering). Whether and how a repair is possible depends strongly on the device.

If the drain pump does not pump off

Now back to the point when you tried to pump the water off. If the water does not drain when you turn on the dishwasher, a foreign object may be in the impeller housing. Depending on the version, you can approach the impeller via the side panel or only by removing the bottom strainer. Also check the smooth running of the impeller. If it does not turn, there is a defect in the drain pump.

Possible defects at the drain pump

However, there are also lye pumps with a magnetic impeller. If it is an old dishwasher, the effect of the magnet may have diminished and the dishwasher may not have pumped out as much as it should. Then, however, when pumping an irregular noise from the drain pump can be heard.

The solenoid valve at the inlet, possibly with pressure box

At the water inlet is also a solenoid valve. In some dishwashers this can be additionally provided with a pressure box. This cause can be closed in particular when the solenoid valve hums. However, you now need a wiring diagram and you need to know how to measure the solenoid valve for proper functioning. If a pressure vessel is a valve, you must also pull off one of the small tubes and create vacuum by sucking it with your mouth.

Create negative pressure and test whether the can triggers again

Then test the valve by measuring it. This valve with pressure box is intended to prevent overflow of the dishwasher. That it has triggered, therefore, has another cause. Often it is the previously described drain pump or a foreign body in the impeller housing. Likewise, however, the drain hose can be blocked (sieve) or kinked.

Tips & Tricks

In rare cases, the pressure valve may also strike groundless. Therefore, you should generate negative pressure in the can and first put the dishwasher back into operation. During the next program starts, you should pay particular attention to the possible noises to which we have referred (drain pump).
Further related information can be found here: Possible systems for the Aquastop of a dishwasher are described here. You can read more about the dishwasher's water bag here. Under "Solenoid valves of the dishwasher" you will find further information about the inlet valve (double valves, solenoid valve with vacuum box). Optionally, a reset of the dishwasher may be useful.


Video Board: How to Repair a Dishwasher that Does Not Fill with Water