Haier Air conditioning Haier Error E4

What does error code E4 mean affecting Haier air conditioner?

When your Haier air conditioner displays the error code E4 on the screen, we are faced with a technical challenge that should not be taken lightly. This error code is a sign that the PCB electronic board of the indoor unit has encountered a very serious problem. Such errors indicate that something deeper is wrong with your air conditioner and that you need to conduct a thorough inspection to find the appropriate solution.

The error code E4 can be intimidating for any user; undoubtedly, it is a problem that can be difficult to solve. But you don't have much to worry about because we have prepared a guide to help you resolve this issue and continue using your air conditioner normally.

If you want to regain the comfort of having cold air in your room or office, you first need to understand the causes that lead to an error code E4 in your Haier air conditioner. Here are the known causes of this problem:

• A failure in the PCB electronic board: The board is the brain of the air conditioner, and its malfunction can paralyze the entire system. Undoubtedly, this component is critical when it comes to managing your entire air conditioner, so it always has to be in perfect condition.
• An electrical overload: Voltage fluctuations can damage sensitive components such as resistors or capacitors found on the PCB electronic board of your air conditioner. Using the air conditioner during thunderstorms or under adverse weather conditions can contribute to the appliance not working properly.
• Natural wear and tear on the components: Over time, the PCB electronic board may suffer certain wear and tear that affects its performance and causes different types of errors. Humidity and lack of maintenance over time can deteriorate not only the electronic board but also other components of your air conditioner.
• Internal wiring in poor condition: Internal wiring and/or sulfate in the connections can also contribute to poor air conditioner performance and eventually display errors such as E4.

All these causes are what can lead to an error code E4 in your Haier air conditioner. But as you can see, practically all the causes point to the PCB electronic board failing.

Could error code E4 be fixed in Haier air conditioner?

In order for you to continue using your Haier air conditioner normally, you need to follow these steps that we will provide below. This list of solutions that we have prepared for you will help you fix the E4 error code definitively:

1. Turn off and disconnect the Haier air conditioner to rule out possible temporary errors: Resetting the air conditioner, although it may not seem like it, could help solve this problem. This procedure helps refresh the sensors, clean the internal logical memory of the air conditioner, and rule out temporary errors. To perform this procedure, it's very simple, you just have to turn off the air conditioner from the power button and then unplug it from the power outlet for a few minutes. After 15 minutes, turn on your air conditioner again to check if the E4 error code has disappeared. This simple procedure will only take you 15 minutes, try it and see for yourself. If the problem persists, proceed with the steps provided below.
2. Check the internal wiring of the air conditioner and the connections where there may be sulfate: You need to check that all the internal wiring of your air conditioner is in good condition, without exception. You can also take the opportunity to check the status of all connections, and thus verify that there is no sulfation that may interrupt communication between components. If you notice sulfate on the connections, then you will have to remove it completely using a specific product for this purpose or with the help of an electronic cleaner and a bristle brush. Once you see everything in perfect condition (at least visually speaking), reconnect all the wiring and connections, assemble your air conditioner and check if the E4 error code has disappeared.
3. Check the PCB electronic board with a multimeter and perform preventive maintenance: Visually inspect the PCB electronic board of your air conditioner for signs of sulfate, disconnection, burned or charred components, etc. For this task, use a multimeter and your knowledge in electronics because it is likely that one of the lines connecting the resistors has broken or burned. You need to check the continuity of each of these resistors and ensure that they have the appropriate ohm value according to the manual and the manufacturer's specifications. If you notice with the multimeter that the board has problems with any component or resistor, then it's time to replace it with a new one. Make sure the replacement is the same model, resistance, impedance, ohms, etc., otherwise the air may not work properly or may display another error code different from the one you fixed, meaning you fixed the E4 error code, but another one appeared due to using improper components.
4. If the problem persists, you will have to go over everything we mentioned earlier and follow the steps to the letter: If nothing you have done has been able to solve this issue and you still struggle with the E4 error code on your Haier air conditioner, what we recommend in that case is to briefly review everything we have mentioned. Make sure you have followed all the steps to the letter to rule out any possible cause that may have caused this failure. If you cannot identify the cause of the problem, then most likely the PCB electronic board has been damaged and needs to be replaced with a new one. If you do not have the knowledge and/or the necessary tools to fully address this situation, then our last advice would be to leave the matter in the hands of Haier's technical staff.
5. Contact Haier's technical support and request a home visit: If you have tried everything and have not been able to solve anything on your own and the E2 error code still appears on the screen of your air conditioner, we recommend scheduling a home visit with a qualified and certified professional in commercial refrigeration, or better yet, with Haier's technical support. Making a call to Haier's technical service to request a scheduled visit will surely not take you more than 10 minutes, so we recommend doing it to receive comprehensive and personalized advice. Haier's technical support staff have the knowledge and tools necessary to solve any problem your air conditioner may have. Once the repairs are completed, they will provide you with a warranty for all the work they have done.

In summary, the E4 error code affecting Haier air conditioners indicates that the problem lies in the PCB electronic board of the indoor unit of the appliance. This problem can be somewhat difficult to solve unless you completely replace the electronic board with a new one that is compatible with your air conditioner model. Remember that if the problem becomes too difficult, you can always rely on Haier's technical support, as they have the knowledge, tools, and spare parts necessary to solve this problem. Good luck!