How to Repair the Circulation Pump in a Dishwasher

Many people today have a dishwasher. The lack of free time forces users to install such equipment in the kitchen to make their work easier. However, even the most modern and high-quality devices break down. In most cases, failures are minor, and their elimination involves replacing the failed part. An important part is the circulation pump, which creates the necessary pressure in the chamber. If it fails, the dishwasher will not work. Let's try to figure out how to replace a dishwasher pump.

How the mechanisms of dishwashers work

The operating principle of the technical device is quite simple:

• The built-in microprocessor reacts to the tightness of the closed door and activates the drain pump;
• When the water level in the pump is sufficient to wash a certain amount of dishes, which is confirmed by a special sensor, the circulation pump comes into operation. It is this part that creates the necessary pressure inside the housing, causing the impeller to rotate;
• At the same time, the dispenser with soap solution opens, the heating element heats the water and the dishes are cleaned of dirt and food debris;
• The dirty water is drained and a new portion is poured in for rinsing. After this procedure, the water is drained, the contents are dried, and the sensor signals the end of the machine’s operation.

Operating principle of PMM

The circulation pump is used to pump water into the systems. It constantly works, pumping and delivering water to the rocker arms, from where it flies out under high pressure. The detergent dispenser immediately opens and food residues are washed into the tray, from where they fall into the filter. The waste water is purified again and supplied to the nozzles. Therefore, the pump is also called a recirculation pump.

A common cause of breakdown of the recirculation unit is a leak. Water gets on the bushings, washes away the lubricant, which leads to their wear.

The pump drains waste water, removing it outside the bunker. After the end of the cycle, the control board gives it a signal to pump out. The impeller is considered the most vulnerable point. Hair and threads often wrap around it, blocking the operation of the mechanism, so it is important to carry out periodic cleaning.

When does the pump need repair?

The dishwasher works, but the water does not circulate after washing, the dishes are not washed. At the same time, you can hear the engine humming. First of all check:

• Inlet filters - if clogged, they are washed under pressure from the tap;
• Injectors - remove the rocker arms from their seats and check their holes; if they are clogged, take a toothpick and clean out the passages.

If the water in the machine does not heat up and the flow heating element is in order, then the engine must be replaced.

Is the drain pump in the Candy or Zanussi PMM constantly running and does not turn off? There may be several reasons:

1. Problems with the electronic board or wiring. The pump triac may be malfunctioning, or the wires may be damaged and do not transmit a shutdown signal.
2. The pressure switch is malfunctioning. The level sensor monitors the amount of water in the tank, after which it sends a signal to the board to stop supplying. If the sensor transmits incorrect readings indicating that there is still water left in the hopper, the pump does not turn off.
3. The dishwasher is not installed level. For example, Electrolux models are very sensitive to tilts of more than two degrees.
4. Incorrect connection to the sewer leads to a siphon effect. The waste flows back into the machine and the pump has to pump it out.
5. The pump itself broke.

The PMM engine and its components cannot be repaired, so a complete replacement will be required. When choosing replacement parts, consider the following factors:

• the real cost of components (the most expensive parts are considered to be for Bosch dishwashers);
• originality - the spare part must fit your dishwasher model.

In Bosch machines the pump is located next to the engine. Whereas in equipment of other brands (Hansa, Siemens) - from above.

Finding out the reasons for equipment failure

How can I check what happened? It’s very simple, if after drawing water the machine does not function, then the following has happened:

• The filter is clogged and needs to be replaced;
• Residues of food got into the nozzle holes and clogged them. To fix this, you need to clean the injectors;
• The circulation pump has failed. This breakdown does not happen often, and it can be identified by the characteristic silence after filling with water. A normally operating pump emits a quiet hum.

Causes of pump failure

Replacing a part in the device is easy. You can do this yourself without calling a specialist. The only thing you will need to do is purchase a new circulation pump that is suitable for your machine model. The most common brands on the market are Bosch, Ariston, Indesit, Beko, Electrolux and Hansa.

Signs of pump malfunction and replacement

Problems with water are the first thing that will indicate incorrect functionality of pumping equipment. It can be identified by the following symptoms:

• a puddle appears under the car body;
• water leaks are found on the walls of the container;
• after washing, contaminated water remains in the device;
• Poor water pumping at the beginning of washing;
• after turning on the machine, the washing process does not begin;
• when the unit is operating, extraneous noise is heard;
• The water pressure when filling or draining is very weak.

In addition, error codes appear on the control panel display.

Our specialists carry out a complete comprehensive diagnosis in 20 minutes, and in Moscow and the Moscow region - absolutely free. Such a check may reveal additional problems in the operation of the device.

Bosch dishwashers

Bosch kitchen helpers are no less popular. So, in favor of this dishwasher, namely its latest versions, we can say the following:

1. The presence of a large working space, which allows you to load one set of dishes more than in previous versions with identical dimensions.
2. It is possible to place a separate basket for forks, spoons and other cutlery.
3. A wide range of different functions, the ability to install more or less intensive washing in the lower section of the dishwasher - this is very convenient, because... You can load dirty dishes, such as pans, into the lower basket.

In most cases, a Bosch model dishwasher recirculation pump is easier to disassemble than to purchase a new one. First you need to remove the pump according to the standard procedure.

Bosch dishwasher circulation pump

Then we move on to disassembling the pump itself:

• separate the upper part of the recirculation device by turning it to the right;
• the lower element of the spare part is non-separable, so it should be moved to the side;
• we find broken plastic bushings on the disassembled part;
• the first sleeve is located at the “foot of the mushroom”, and the second is “inside the cap”. Please note that it is quite difficult to select identical bushings, so it is better to contact a mechanic for ceramic substitutes.
• Having disassembled the upper part of the mechanism, you need to clean the grease and dirt from its surface. This must be done carefully so as not to damage the part.
• at the last stage, you need to return the new bushings to their place and install the top of the pump to the non-separable lower part, which you previously set aside. At this point the repair work is completed.

Ariston dishwashing equipment

If the circulation pump for an Ariston dishwasher is broken, then to disconnect it you will need to lay the equipment on its side, remove the lower part of the bottom, disconnecting the latches. The next step is to disconnect the power cable and remove the broken part along with the fastener. After removal, you need to press your toes with your toes, with which the pump is held in the volute, and turn the part counterclockwise. Ready.

Circulation pump for Ariston dishwasher

In order to install a working central unit in place, you need to do all the previous operations in reverse order:

• Insert the device into the cochlea, turning it clockwise until it clicks;
• Install the finished structure in the old place and connect the power wire. The control wire also needs to be connected;
• The bottom with the pallet must be installed in its original position and the machine must be placed vertically.

Repair of the circulation pump of the Indesit dishwasher

Typically, Indesit guarantees the quality of its products, so the cause of failure of the central heating unit may be clogged components of the element. In some cases, it is enough to simply wash the circulation pump for the Indesit dishwasher with detergent under warm running water and remove any remaining food and dirt from the holes. If this does not help, then try replacing the seals (rings and washers) with new ones.

It is extremely rare that parts of an element wear out. In this case, you will have to purchase a new part to replace the old one. You can replace the damaged part of the machine according to the previous schemes. The process is practically no different from the options discussed above. The same goes for Electrolux, Hansa and Beko dishwashers. The only important difference concerns the cost of the pump. Spare parts for this type of parts are much cheaper than for Bosch, Ariston and Indesit. The most expensive spare parts are for Bosch equipment.

Therefore, before replacing, it is worth checking the compatibility of parts. In some cases, you can use elements from other companies if they are completely the same in size.

How to replace the pump in a Bosch dishwasher

To replace the pump, you will have to dismantle part of the unit housing, remove the pump dampers and mounting fasteners. To do this, you need to remove the drain filter on the way to the fastenings, check the injectors, and disconnect the power wires.

Without experience, it is better not to undertake this kind of procedure. By calling a specialist in our service center, you can make repairs with a guarantee of results. Such reliability, lasting for two years, is officially guaranteed by each of our specialists, and in an official format.

Dishwasher drain and recirculation pumps

Functional differences

The task of the recirculation pump is to pump or pump out water and gas-air mixtures. For a dishwasher, it provides a continuous supply of water into the working chamber, spraying it through special devices for high-quality dishwashing. The water is then filtered, heated and pressurized again - these are the functions of the main engine of the machine.

When choosing a new circulation pump, each user should focus on the following important factors:

• real cost;
• compatibility with the model of household appliances installed in the house.

The dishwasher pump, which is located at the bottom of the unit, is responsible for draining waste water after all work is completed. On Bosch models it is located next to the circulation pump in one block, on others on top. It differs from the main pump in size, but their operating principle is identical, only the first circulates water inside the machine, and the second removes it into the sewer.

Design

Both pumps have almost the same design, but different dimensions and layout. Let's take a closer look at each detail and the principle of its operation.

Circulation pump

The quality of all modes of the machine depends on the stable operation of this device: water circulation while washing dishes is carried out using a dishwasher pump.

A heating element is inserted into its body - in modern household appliances they are usually of the flow type, i.e. instantaneous.

The circulation pump supplies water to the rocker nozzles, from where it escapes at a fairly high speed; the centrifugal force causes them to rotate and spray the water flow throughout the tank - a working container made of stainless material. All food debris is washed away under this pressure, the water flows to the bottom, where it is filtered, sucked into the tank and again supplied to the nozzles. Thus, there is a constant recirculation of the water flow in the machine.

Drain pump

The drain pump is responsible for removing waste water from the machine after the washing process is completed. The control module gives a signal, the pump turns on and the contaminated water is removed from the machine. Experts call the drain pump impeller a weak point - if it is blocked by a foreign object, it rotates on the shaft, and the device must be replaced: such a defect cannot be repaired.

Diagnosis of failure

Having basic technical knowledge, it is quite possible to independently determine the cause of failure of the dishwasher unit. If there is no water circulation in the machine, the coarse and fine filters are not clogged, and the nozzles on the rocker arms are clean, then this is a sure sign that it is time to replace the circulation motor - there can be no other options.

Important! The circulation motor cannot be repaired, but must be replaced.

When the water in a Bosch dishwasher does not heat up, the circulation pump must also be replaced, because it uses instantaneous elements to heat the water - they are not dismantled.

The most common reason for a drain pump to break down, not only on Bosch machines, but also on other products of a similar type, is the clogging of the drain filter along with the pump with foreign objects. The filter is easy to clean and is ready for use again, but with the pump, things are usually much worse - it needs to be replaced. To dismantle you will have to disassemble almost the entire machine; if you are not confident in your abilities, it is better to call a specialist.

Replacement algorithms

So, in order to replace the recirculation pump for any dishwasher or drain pump, you need to disassemble the machine almost completely. To do this, you will need simple tools: a screwdriver or screwdriver, pliers, an awl and a considerable supply of enthusiasm and self-confidence.

Getting ready for renovation

First you will need to complete the preparatory steps:

1. the dishwasher is disconnected from the power supply, the hoses are disconnected, the housing is installed in such a place that it is convenient to disassemble it;
2. Unscrew the screws holding the side panels and remove them;
3. We rearrange the dishwasher upside down, remove the soundproofing material from the side walls;
4. We find on the side walls a mechanism designed to smoothly open the door. It consists of a cable, plastic blocks and springs that must be unhooked, holding the door and preventing it from falling;
5. the pallet is held on hooks located at the corners of the chamber. They will have to be unlocked using a screwdriver;
6. at the very base of the tray, where the machine hoses fit, there are also hooks and electrical wiring plugs. All these elements are detached;
7. Having completed all the above steps, carefully lift the pan, disconnect the input pipe, and remove the pan from the machine.

In front of us were the most important parts of the machine, in the center - the circulation pump, which must be replaced. It is impossible to confuse the part with anything else, because it is the largest, and many wires are connected to it.

If you have Bosch or Ariston dishwashers, then flow-type water heating elements are installed inside the pumps. True, it will not be possible to change them separately - a new pump is needed in any case.

Preparations for work are completed. Now let's figure out how to replace the pump.