Daikin Air-Conditioning Error U4

What could the U4 error code mean affecting your Daikin air conditioner?

If the U4 error code has appeared on your Daikin air conditioner and has you worried, then you are in the right place to understand its meaning. We want to reassure you right away that you don't have much to worry about because today we bring you the solution to this problem. So keep reading and stay with us. Today we will talk about the causes that lead to this problem occurring in your air conditioner and we will also tell you what solutions you can apply to achieve a definitive solution.

The U4 error code on Daikin air conditioners indicates that there is a communication problem between the indoor and outdoor units of your device. This problem may be a bit complicated to solve but don't worry, join us and let's see what we can do to fix this problem.

The first thing we need to know are the possible causes that can trigger the U4 error code on Daikin brand air conditioners:

• A communication problem between the indoor and outdoor units: It may be that a cable is damaged or disconnected, that connections are loose or dirty, or that one of the PCB electronic cards of the indoor or outdoor unit is damaged.
• A problem with the electrical supply in one of the units, both indoor and outdoor: There may be electrical noise in the supply, very strong electrical discharges, or voltage spikes.
• Some issue with the power supply in one of the units: If the power supply of the indoor or outdoor unit fails, it can cause the U4 error code to appear on your Daikin air conditioner.
• A problem with the temperature sensor: The temperature sensor of the indoor or outdoor unit may be the cause of this problem, perhaps it is very dirty or has been completely damaged.

All these causes make the U4 error code appear on Daikin brand air conditioners. But you don't have much to worry about because today we bring you the solution to this problem.

How are we going to help you fix the U4 error code of your Daikin air conditioner?

Here's a list of possible solutions to fix the U4 error code on Daikin air conditioners. Do not skip any of them and follow them to the letter, you will likely find the solution to your problem:

1. Turn off and disconnect from the power supply the air conditioner to reset its sensors: Let's apply a reset of the air conditioner, which is the easiest thing we can do to try to solve the problem. To do this, what we have to do is turn off the air conditioner and disconnect it from the power supply for a few minutes. Once the time has passed, reconnect the equipment and turn it on to check if the U4 error code has disappeared.
2. Check the electrical wiring that connects the indoor and outdoor units of your Daikin air conditioner: This wiring must be in very good condition without exception. Visually inspect all this wiring and look for damage if any. Make sure that no cable is broken, cut, burnt, disconnected, or charred. If you find cables in poor condition, you will have to replace them with new ones or make the necessary repairs.
3. Verify the connections of the wiring in the indoor and outdoor units of your air conditioner: These connections must be in perfect condition to function correctly. Check and make sure that all connections are well tightened and free of dirt or dust. Sometimes these connections corrode due to the humidity generated by the air conditioner itself, in which case we recommend applying an electronic cleaner on the contacts and cleaning everything well with a brush to remove the corrosion.
4. If the problem persists, please repeat all the previous steps and make sure to follow everything to the letter: If the previous solutions do not work, it is possible that the PCB electronic cards of one of the units, the power supply, or the temperature sensor have a somewhat complicated problem to solve. In that case, you would have to do a more thorough review or leave the problem in the hands of experts. If you think this could be your case, then we recommend that you contact an authorized Daikin service technician. Keep in mind that if you want to continue checking the air conditioner on your own, you need to have extensive knowledge in electronics, as well as the appropriate tools to carry out this entire review.
5. Call a Daikin technical service and request a home visit for a more thorough review: A qualified Daikin technician can diagnose the problem accurately and solve it quickly and effectively, in addition to having all available guarantees as appropriate. We invite you to call Daikin's technical support, we are sure they will give you an appropriate solution to this problem.

To conclude this topic, you need to know that the U4 error code in Daikin air conditioners is a communication failure between the indoor and outdoor units of the appliance. Therefore, to find a solution to this failure, you have to follow the steps we described earlier in this article. Remember that if things get difficult, you can always turn to Daikin's technical service to help you solve the problem.

Tips to prevent the U4 error code from appearing again in your Daikin air conditioner

• Make sure you keep your air clean and with your preventive maintenance up to date.
• Please check carefully that the electrical supply is adequate for your air conditioner and protect it with a good voltage regulator or a surge suppressor.
• Be careful to use the air conditioning in extreme weather conditions, if you see that there is a lot of stormy weather, it would be best to turn off the air conditioning and wait for the storm to pass.
• Always review and consult the manufacturer's manual to learn more about the operation, options, care and maintenance of your Daikin air conditioning model.

Thank you for reading us today! We hope we have been able to help you solve the E6 error code on your Daikin air conditioning and that you do not have so many problems when making these repairs. Good luck and see you later!