Error E4 in Haier washing machine

If your Haier washing machine displays the E4 error code, carefully monitor its operation until the code appears on the display. To do this, turn off the washing machine and restart it (unless you feel an electric shock when touching the machine). If the error code appears several minutes after startup, there is a problem with the water heating system.

Let's do the calculations

What should I do if I see a code on the screen? One of the reasons for the error E4 – failure of the washing machine heating element. You can diagnose the heating element yourself by testing it with a multimeter.

The tester will determine the resistance produced by the heating element. To calculate the nominal value for your specific washing machine model, you'll need to recall some basic physics. Resistance in ohms is determined by the formula: R = U²/P, where:

• U – voltage in the electrical network (in an apartment or house the parameter value is usually 220 Volts);
• P is the heating element's power. You can find this value in the manual. If the manual doesn't provide the exact information, you can search the web for the power value. You can also find information about a specific machine model online.

If the resistance you calculated matches the value measured by the multimeter, then the heating element is working properly.

How does this calculation work in practice? Let's say the heating element's power is 1800 watts. Then the resistance will be 220 x 220/1800 = 26.89 ohms. A faulty heating element can be detected if the tester shows a reading significantly higher or lower than the calculated value.

We call TEN

So, if you're repairing a Haier washing machine displaying the E4 error code, you should start by checking the heating element. Before starting any repairs, be sure to disconnect the power to the washing machine. Next, remove the back panel of the appliance and locate the heating element mounting location. Then, carefully disconnect the power supply from the element.

Set the multimeter to resistance mode and set the selector to 200 ohms. Connect the tester probes one by one to the heating element's terminals. The heating element will transmit a value close to the calculated value to the multimeter. If the tester displays a one or zero, the heater must be replaced; repair is not possible.

Next, you need to check the heater for breakdown. Inside the heating element tubes, between their walls and the internal coil, there is a dielectric that sometimes leaks onto the washing machine's body. This situation is extremely dangerous for the user, as it causes the washing machine to give an electric shock.

To further diagnose the heater, set the multimeter to buzzer mode. If you short-circuit the device's probes, a light will immediately appear on the screen and the tester will begin beeping. One probe should be touching the heating element terminal, and the other should be touching the element's body. If the multimeter remains silent, all is well; the tester's beeping indicates the heater needs to be replaced.

Testing the temperature sensor

A broken heating element is not always the cause of the E4 error. The error code may indicate a problem with the temperature sensor. The thermostat is located directly on the heater. To fix the error, you'll also need to check the thermistor. To do this:

• remove the back cover of the washing machine;
• carefully disconnect the wiring from the sensor;
• slightly loosen the bolt holding the heating element;
• remove the thermostat.

The temperature sensor is also checked using a multimeter.

The tester is switched to resistance measurement mode. The multimeter probes are connected to the thermostat contacts. The sensor is then lowered into a container of hot water.

At a water temperature of 20°C and a functioning thermistor, the tester will indicate a value of approximately 6000 ohms. After immersing the temperature sensor in water, monitor the multimeter readings. The thermostat is working if the resistance is below the specified value. When the water temperature is approximately 50°C, the resistance value should be approximately 1350 ohms.

If the temperature sensor is damaged, it will need to be replaced. The thermostat cannot be repaired. Reassembly of the washing machine is done in reverse order.

   

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