Error E22 on a Siemens dishwasher

Error E22 on a Siemens dishwasher Despite the complex design of modern household appliances, you can handle most breakdowns yourself, even without calling a service center specialist. For example, error E22, which reports a lack of drainage of waste fluid, can be easily eliminated at home. Let's look at why it could arise and how to deal with it without outside help.

Common reasons why water does not drain

First, let's identify all the reasons why drainage problems could occur in a Siemens dishwasher. These are the most basic problems that arise most often and are the easiest to deal with.

The drain hose is kinked. This could happen because the drain hose was bent somewhere, or a heavy object was accidentally placed on it, for example, the dishwasher itself, which blocked the flow of water. In this case, resetting the E22 error is very simple - you just need to straighten the hose, remove unnecessary objects or equipment from it, and then check for damage. Be sure to check the functionality of the Siemens machine after the manipulations done. This will help you understand whether the error code has disappeared or not.
Dust filter clogged. This usually occurs due to foreign objects such as food debris, bones from meat and fruit, napkins, tea bags, and glass shards. Correcting the situation is also elementary - you need to clean the filter, and also do not forget to clean it at least once a month for preventive purposes.

The manufacturer recommends not loading dirty dishes with leftover food into the washing chamber so that foreign objects do not clog the filter element.

The pump or drain pipe is clogged. And in these elements, foreign objects can cause error E22 to appear, since debris will clog into the parts and prevent the waste fluid from going down the drain after the operating cycle.

It is these three situations in Siemens dishwashers that most often provoke the appearance of error E22. We will study solutions in detail in the following sections.

Haven't cleaned the filter in a while

When the cause is a clogged drain filter, you can fix the situation with your own hands in just half an hour. In this situation, regular cleaning is necessary, which should be repeated at least once a month. What should I do for this?

First of all, drain all the waste liquid that remains at the bottom of the washing chamber after washing. The easiest way is to place a large container, disconnect the drain hose and activate the drain manually. This will also help evaluate the pipe and sewer system for any blockages.
Once all the water has been drained, you can proceed to cleaning the filter element. First, disconnect your Siemens dishwasher from all connections and remove all dish baskets from the hopper. Then remove the garbage filter from the bottom of the washing chamber, and then the mesh installed below it. Remove all dirt with a brush and a powerful stream of hot water from the tap.

If stubborn stains cannot be removed, you can soak the parts in a solution of citric acid for at least an hour.

After reassembly, you need to run an idle cycle without dishes to check the wash. If error code E22 remains on the display, then you need to look into other causes.

The pump is faulty or blocked

If the filter element is working and cleaned, but the water still does not go down the drain, then you need to check the functionality of the pump and its impeller, which could be blocked by fragments of broken dishes. To get to this unit you will have to disassemble the equipment. If the warranty on the Siemens “home assistant” has long expired, then you can disassemble the machine yourself.

We have already drained the water, but we need to tilt the dishwasher a little more on its side to get rid of any remaining water.
Use a sponge or cloth to go over the garbage filter to remove all moisture.
Place the machine on the back wall.
Disconnect the fasteners holding the bottom of the device.
Carefully disconnect the Aquastop sensor installed on the other side of the pan.
Disconnect the wires connected to the pump, unscrew the fasteners and remove the element itself.

Take a few photos of how the wires are connected correctly - this will help with reassembly.

First you need to remove the pump cover and carefully inspect the impeller for foreign objects. If there is glass inside that has actually blocked the movement of the part, then it must be carefully removed and the rotation of the impeller checked. Then you should set the multimeter to resistance measurement mode, connect the device probes to the pump contacts and check the data. Normally, the resistance should be about 200 Ohms, but if the tester shows radically different values, then the pump should be replaced with a new one.

The machine does not know the water level

If none of the above helped reset the error code, then all that remains is to check the water level sensor. A pressure switch in the machine is installed to monitor the pressure in the system and subsequently transmit data to the control module of the Siemens dishwasher. Using this information, the dishwasher’s “brain” determines the further course of action, so if there is no data, or it is transmitted with errors, then the natural course of washing will be disrupted. What should I do to correct the situation?

The water level sensor is located near the pump, so the parts can be checked in pairs. The pressure switch looks like a small round plastic washer with a pressure tube.
Carefully remove the tube using pliers, unscrew the clamps, and then remove the pressure switch.
Like the pump, the sensor must be tested with a multimeter set to ohmmeter mode.

If the tester data indicates a breakdown, or there is visible damage to the element, then it needs to be replaced. Take a failed pressure switch to the store as an example, or write down the serial number of the Siemens dishwasher so as not to make a mistake when choosing a spare part. In a situation where the drain does not work even with a new sensor, then most likely the control board has failed. There is no point in trying to restore it on your own, as the risk of damaging it even more is too great. It would be safer to call a service center specialist to check everything and repair it if the part needs to be repaired.