Aquastop (water stop) at the dishwasher

It is usually not easy to open the corner valve to which the dishwasher is connected for operation and then turn it back on. Otherwise, there is a risk of costly water damage. That is why today almost all dishwashers are equipped with Aquastop.

Aquastop against flooding in the kitchen and bathroom

Whether dishwasher or washing machine - not only that it is usually annoying and cumbersome to constantly open and close the water supply. Not infrequently it is forgotten to close the water after the program run again. Water damage is then usually severe, but the water flows as well into the floors below. Aquastop systems provide a remedy.

This is how Aquastop works

The operating principle is always the same: if too much water runs through the inlet hose, a valve blocks the water inlet directly below the stop valve (wall side). It is a conspicuous plastic box on the wall-side hose end, in which the valve is housed. In addition, the tube is also good to recognize as an aquastop tube, as it is compared to conventional feed hoses not smooth, but ribbed.

Aqua Stop Systems

However, the functionality can be significantly different, even if the water supply is always interrupted:

  • mechanical aquastop systems
  • electric aquastop systems
  • electronic aquastop systems

Of course, all systems have advantages and disadvantages. Here is a short summary of the different Aquastop systems:

Mechanical aquastop systems

The hose location fuse

In the hose location safety device, a pressure is built up in the inlet hose. The aquastop has three channels connected by rubber discs and springs. At normal pressures there is a balance - the water flows equally through all three channels.

If the pressure suddenly changes (tube slips from the Aquastop or the hose bursts), the valve closes immediately. The disadvantage: not enough water runs out of a small leak, so that the pressure changes significantly. So does not work for smaller leaks.

This system can also be designed so that in a double-walled hose, the escaping water runs up to the Aquastop box. This will trigger the mechanism that closes the inlet. To reset the Aquastop, the different systems can be equipped with a push button.

Aquastop with counter

In Aquastop box is a check valve with counter. This counter can be set to a certain amount of water. If this amount is exceeded, the valve switches. If the water flow stops completely because the washing or cleaning program is completed, the counter will automatically reset to zero. Even minor leaks that leak over a long period of water, are detected and the system closes the water inlet.

Chemical-mechanical water stop system

There is another stop system that works mechanically but not exclusively mechanically. It is also a double-walled hose necessary. However, the space between the two hoses is filled with an agent that expands extremely upon contact with water. If even the smallest leaks occur, the gap swells to such an extent that no more water can run through the inner hose. When the system has been triggered, a new hose is needed.

Electric and electronic water stop systems

Again and again, electric aquastop systems speak of "sensors". That is not quite true. Electrical systems require a mechanism that triggers. Sensors (in the sense of real sensors), however, are controlled electronically. The use of the word "sensor" in electric aquastop systems therefore refers to mechanical releases.

Pressure cell and air trap

In the dishwasher, this may be the air trap or a pressure box on the water inlet valve. This area is also associated with other components, such as the water pocket of a dishwasher. This too can trigger an air trap or a pressure cell. If the valve is triggered, it closes the inlet in the Aquastop housing directly at the water connection.

Floats and drip pans

Other systems use a floor pan connected to a float. When the float goes up, the valve is closed electrically. The gap to the outer tube not only includes the electrical line. He can also lead to a special tub. If the actual water hose bursts, the water, which could leak before closing the valve, runs into the space in this space and is pumped out immediately.

Reset Aquastop

For some devices, the pressure should return to normal when a new Aquastop tube is fitted. With pressurized cans, you may need to blow something into the can to eliminate the vacuum. For float systems, care must be taken to ensure that the drip tray is no longer full of water - unless pumped out automatically.

Electronic systems

Electronic systems for Aquastop are sensors that detect when, for example, soil moisture sensors register moisture or moisture. With electronic Aquastop the whole dishwasher can emergency shut off. Then there are several ways to restart the device:

  • a reset of the dishwasher
  • Turn off and turn on again
  • Pull the power plug for a while

repair options

For some Aquastop systems it is sufficient to replace the inlet hose with another mechanical Aquastop system. These include electrical systems with floats. The program control must not be included, as is the case with an electronic Aquastop. Because if the dishwasher can not find the valve from the Aquastop, it will always end in emergency shutdown.

Determine if the aquastop is broken at all

To determine whether Aquastop is defective, the so-called bucket test must be made. Remove the inlet hose from the washing machine or dishwasher. Hold the unscrewed end in a bucket and turn off the check valve. Then measure how many liters of water are in and how many seconds are left. If there is very little or no water, the Aquastop has a defect or is triggered.

Tips & Tricks

Some manufacturers offer an additional guarantee for their Aquastop equipment: if water damage occurs despite Aquastop, the costs of water damage will be covered. But not every manufacturer offers this guarantee. If you are interested, ask the retailer for a corresponding dishwasher and inquire about the specific conditions and conditions.

Video Board: Figuring out how a bosch aquastop works