Error 7 in a Haier washing machine

Error 7 in a Haier washing machine Automatic washing machines equipped with a self-diagnostic system quickly detect malfunctions and notify users. What should you expect if the ERR7 or simply 7 error code appears on the appliance's display? This error is not a good sign. While it may seem easy to reset the code by rebooting the appliance, after a couple of washes, ERR7 can eventually paralyze your Haier washing machine. Let's look at what steps you can take to restore the appliance to working order.

Let's check the engine

Calling a technician isn't always necessary to fix a problem. You can diagnose and repair it yourself. Most often, error code 7 indicates problems with the washing machine's electric motor or a break in the motor circuit.

Haier washing machines are equipped with collector motors, so you can easily test them yourself at home.

First, you need to remove the engine. To do this: check the condition of the brushes

remove the back wall of the washing machine body by unscrewing the screws holding it;
disconnect the wiring leading to the motor;
Remove the bolts holding the motor in place and remove it from the machine.

What to do next? Begin diagnosing the electric motor. Connect the stator and rotor winding wires and apply 220 volts to it. The motor will "pass the test" if the rotor starts to rotate. This diagnostic method has several drawbacks:

It is impossible to confirm the full functionality of the engine, for example, how correctly it will function in different modes;
There's a high risk of burning out the motor due to the direct connection of the element to the power grid. To minimize the risk of short-circuiting the motor, a ballast (for example, a washing machine heating element) is included in the wiring diagram. This additional element, in the event of a short circuit, will heat up, protecting the electric motor from burning out.

When checking the motor, inspect the brushes. They are located on the sides of the motor housing. Brushes are subject to wear because they are made of a relatively soft material. Basic observation can help confirm that they are the cause. For example, when connecting the motor wiring to the power supply, the motor will spark. If the components are severely worn, the brushes need to be replaced. Spare parts can be purchased at specialty stores; please confirm the model of your Haier washing machine with the salesperson.

Sometimes the display shows error 7 due to problems with the fins. These components conduct electrical current through the brushes to the rotor. This may be due to delamination of the fins. Small delaminations on the fins can be repaired on a lathe by turning the commutators. The resulting chips must be thoroughly cleaned. When inspecting the fins, look for any defects on their surface that indicate damage.

Let's test the control module

If the Haier washing machine's electric motor diagnostics did not reveal any malfunctions, you'll have to dig deeper. Error code 7 may indicate that the main control module is not working properly. Repairing a control board is quite difficult and requires certain knowledge and experience with electronics.

You can perform a visual inspection of the module at home. Examine the board for burnouts, damage, and other defects. To inspect the main unit, follow these steps:

de-energize the washing machine;
remove the detergent dispenser from the housing (pull the tray towards you, pressing on the central latch);
unscrew the bolts securing the washing machine control panel;
Using a thin screwdriver, release the latches holding the panel;
Carefully, so as not to break the wiring, place the control panel on the lid of the washing machine.

The "brain" of a Haier washing machine is located directly behind the control panel. Before disconnecting the wiring from the unit, be sure to photograph or draw a wiring diagram. Then, carefully disconnect the wires and remove the control module. To access the main board, you'll need to release the latches on the unit housing.

Carefully inspect the control board. If you find any burnt areas or other defects, the part will need to be repaired. You can attempt to repair individual components of the board yourself. To do this, you'll need a soldering iron, a multimeter, and replacement components.

Before attempting DIY repairs, consider your own capabilities and knowledge, as the cost of a control module is quite high.

The upcoming front of work in case of breakdowns of various kinds. control board testing and repair

Capacitor. It functions as a stabilizer on the circuit board. If a capacitor is damaged, solder a new one to the positive electrode. The polarity of the electrodes can be verified using a multimeter.
Resistor. Component diagnostics are performed using a tester. First-order resistors will ideally show a resistance of 8 ohms and an overload value of 2 amperes. Second-order resistors show readings of 3-5 amperes, and the resistance value is directly related to the module's frequency. If the measured values do not correspond to the standard values, the components are replaced by soldering.
Thyristor unit. The negative resistance of the commutator is measured. The multimeter reading should not exceed 20 V.
Block filter. This element may burn out. Cleaning the cathode will help fix the problem.
Trigger. The voltage at the input contacts is detected. The optimal value is no more than 12 V. The standard trigger filter resistance is 20 ohms. A new element is installed by soldering.

Damage to the control board can occur due to strong vibrations or power surges. Therefore, it's important to install the machine correctly to avoid premature failure. If attempts to reset the error code are unsuccessful, contact a service center.