How to replace a drain and circulating pump in a dishwasher

When it comes to replacing the pump in a dishwasher Bosch, Ariston, Indesit, Electrolux or other brands, the first thing to do is understand the design of the equipment. It is important to understand which part is to be changed, because the drain pump and the circulation pump (motor) are different things. Let us consider in more detail the purpose of these elements in the dishwasher and the principles of their replacement.

How the PMM works

The circulation pump is used to pump water into the systems. It constantly works, pumping and supplying water to the rocker arms, where it flies under great pressure. Immediately the dispenser of detergents opens, and the food remains are washed into the tray, from where they enter the filter. The waste water is again cleaned and fed into the nozzles. Therefore, the pump is also called recirculation pump.

A common cause of failure of the recirculation unit is leakage. Water enters the bushings, flushes out the grease, which leads to wear.

The pump drains the waste water out of the hopper. After the end of the cycle, the control board gives it a signal for pumping out. The most vulnerable place is the impeller. Around her often wound hair, thread, which block the work of the mechanism, so it is important to carry out periodic cleaning.

When the pump needs repair

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

• Inlet filters - with a blockage, they are washed under pressure from the tap;
• Nozzles - remove the rocker from the seats and check their holes; if they are clogged, take a toothpick and clean the aisles.

If the water in the machine does not heat up, and the flowing heater is OK, then the motor must be replaced.

The drain pump in the PMM Candy or "Zanussi" constantly works and does not turn off? The reasons can be several:

1. Problems with the electronic card or wiring. Probably, the triac of the pump is broken, or the wires are damaged and do not transmit the shutdown signal.
2. Crash in the work of the pressure switch. The level sensor monitors the amount of water in the tank, and then signals the termination board. If the sensor transmits incorrect readings indicating that there is still water left in the bin, the pump is not turned off.
3. The dishwasher is installed unevenly. For example, models "Electrolux" are very sensitive to slopes more than two degrees.
4. Incorrect connection to the sewage system leads to a siphon effect. Sewage is returned to the machine, and the pump has to be pumped.
5. The pump itself broke down.

The PMM engine and its components are not subject to repair, therefore a complete replacement will be required. When choosing replacement parts, consider the following factors:

• the real cost of components (the most expensive items are considered to be dishwashers "Bosch");
• originality - the part should fit your dishwasher model.

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

How to check and replace the drain and circulating pumps

Prepare the entire repair kit so that the parts and tools are at hand. You will need:

• pliers;
• set of slotted screwdrivers;
• awl;
• multimeter for diagnosis.

Immediately check and unlock the impeller. How to clean the pump:

1. Disconnect the PMM from the network.
2. Open the hopper door.
3. Remove the basket for the dishes.
4. Pull out the drain filter. You can clean it from the blockage with a brush under the pressure of water.
5. Take the sponge and pour the water out of the filter hole.
6. Pull the pump cover (if there are screws - unscrew).
7. Put on gloves and feel the impeller. Remove foreign objects.

To change the engine or the pump, it is necessary to disassemble the dishwasher. The principle of disassembly is similar to almost all manufacturers. We describe the general sequence of work, anddetailed instructionscan be read in a separate article.

1. Remove the plug from the outlet, turn off the dishwasher from the communications.
2. Open the door and remove all the baskets.
3. Pull out the drain filter.
4. Unscrew the side walls of the PMM.
5. Remove the thermal insulation.
6. Place an old blanket or towel and flip the equipment on its side (at the back).
7. Disconnect the water inlet hose.
8. Remove the bottom. It can be fastened with screws or snaps.
9. Disconnect the motor and pump wiring.
10. To remove the drain pump, hold it in your hand and turn it counter-clockwise.

You removed the pump, now you need to remove the circulation pump:

1. Disconnect the drainage pipe from the circulation unit.
2. Remove the part from the attachment and pull it out of the machine.
3. Unscrew the water inlet hose.

We recommend that you take pictures of the connectors before disconnecting the wiring. In the future, it will be easier for you to connect them.

If you find a leak, you may have to replace the bushings of the recirculation unit. To do this, you need to disassemble the motor:

• remove the upper part of the block by turning it to the right;
• the lower sector is not foldable, so let's deal with the upper part;
• inside you will notice damaged bushings and traces of workings;
• if you can not pick up the bushings in the store, you'll have to order the details from the locksmith;
• replace the elements and assemble the unit.

To check the electronic part, connect the multimeter test leads to the motor terminals. Resistance on the screen should indicate whether the element is defective or not.

Repair is not difficult to do by oneself, the main thing is to follow the recommendations. The most time is occupied by disassembly of equipment - in total you have to manage for half an hour-hour. If you did not repair before, then it's better to contact a specialist.

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