UBL washing machine: principle of operation, types, repair

An automatic washing machine is an indispensable assistant for every housewife, which facilitates the washing process and makes it possible to carry out several tasks at the same time. This household appliance is a complex device, which can be disrupted even by minor breakdowns and malfunctions. Often housewives are faced with the problem of the impossibility of closing the hatch of the car, which leads to the blocking of the starting system. The cause of this malfunction is a breakdown of the sunroof locking device, which can be eliminated both independently and with the help of qualified specialists.

UBL of a washing machine - a door lock device, which is an integral part of an automatic washing machine... Its main purpose is blocking the door of the device and ensuring the safe operation of the device. If the element is broken and does not work, the automatic control system of the machine will not start the washing process.

In order to understand the principle of operation of this device, you need to pay attention to how it works. The mechanism design consists of the following elements:

• retainer;
• thermoelement;
• bimetallic plate.

The hatch lock is located inside the plastic case. The locking system and the lock are connected by a metal spring, which is located at the bottom of the hatch. At the moment of receipt of the command from the control module about the start of washing, the hatch blocking device receives a certain discharge of electric current on the thermoelement. The heated thermoelement transfers thermal energy to the bimetallic plate, which, increasing, presses on the latch. If a breakdown occurs in this working chain, the hatch will not be blocked, and the machine will not start working.

Modern manufacturers of automatic washing machines use two types of sunroof locking devices:

• electromagnetic;
• bimetallic.

An electromagnetic lock is a device that works only when there is an electrical voltage. Due to this feature, this type of blocking is less and less used in the manufacture of washing machines.

The bimetallic lock is a popular locking element, the principle of which is to heat a thermal element using voltage. This heated element raises the temperature level of the bimetallic plate, which presses on the lever, and it, going down, blocks the door. After the end of the washing process, all the elements cool down and return to their original position, which leads to the unlocking of the hatch.

Despite the reliability and durability of the UBL washing machine, experts recommend paying attention to the following reasons for its breakdown:

• long period of operation;
• mechanical wear;
• frequent power surges;
• failure of the retainer tongue;
• violation of the rules and regulations of operation;
• mounting skew;
• linen stuck between the door and the cabinet;
• breakage of the triac on the central board.

The following symptoms may indicate a malfunction of the lock:

• the inability to open the hatch after the end of the wash and turn off the device;
• no lock of the hatch after setting the washing mode and pressing the start button;
• the appearance on the display of a sound and digital message about the breakdown of the UBL.

In order to check the element and determine whether the device is working or not, the following manipulations must be performed:

• disconnecting the device from the electrical network;
• opening the hatch and removing the rubber clamp;
• opening access to the lock by moving the cuff to the side;
• dismantling of fasteners fixing the element;
• disconnecting the wiring;
• removing the sunroof locking device.

This technology is only suitable if the hatch door is open. In the event of an element breakdown when the hatch is closed, it is necessary to remove the basement panel and, using a special cable, carry out an emergency opening. The design of many models does not provide for the presence of a cable, then experts recommend remove the top cover and, putting your hand inside the drum, lift the latch.

After all the preparatory measures have been carried out, you can proceed to the diagnostic stage.

At home, you can only check the thermocouple and the heating plate. To carry out diagnostics, the following manipulations must be performed:

• setting the multimeter to measure resistance;
• installation of probes on neutral and phase contacts (a three-digit number on the tester is a sign of no breakdown);
• connection of probes to common and neutral contacts (the appearance of 1 or 0 on the tester display is a sign of a breakdown).

In the absence of a breakdown it is necessary to conduct a visual inspection of the device for mechanical damage and factory defects.All diagnostic work must be done as carefully and carefully as possible in order not to harm the device.

Repair and replacement of the lock is a simple process that you can do yourself if you have even minimal experience in repairing household appliances. In the absence of repair skills, experts recommend contacting a service center where qualified specialists work.

If the latch is broken and does not close, it must be replaced or repaired. A prerequisite is the complete identity of the model and serial number of the new and old parts. Before installing the element, it is necessary to disassemble the old mechanism and free up the seat.

Steps for installing the hatch lock:

• connection of wiring to UBL;
• setting the castle inside and placing it in the seat;
• installation of fasteners;
• installation of a cuff and a clamp.

For the safe operation of the device after repair work, a number of requirements must be met.

• Mandatory grounding of the SMA.
• Installation in the RCD panelwhich will control the leakage current.
• Install the washing machine only on a level floor. It is strictly forbidden to lift the mechanism to a height, the movement of which during spinning can cause the device to move and fall.
• At the first sign of a water leak it is necessary to call specialists immediately.

An automatic washing machine is a complex mechanism in which the breakdown of one element can provoke the failure of the entire apparatus. Often seemingly insignificant malfunctions cause a large number of problems and difficulties. One of the underestimated problems is the malfunction of the sunroof locking device. If a breakdown is found, it is necessary to immediately begin to eliminate it. Some craftsmen find a way to close the hatch without a locking lock.

This manipulation can lead not only to damage to property, but also to electric shock to others, as well as to the occurrence of mechanical damage during washing.

Repair UBL washing machine, see below.