What does Daikin U0 Error Code Mean?

Daikin u0 error code simply means that there is insufficient gas in the system. It is as easy as that. Thus, most of the time it does not need any mechanical repair or parts replacement. It is as simple as topping up the Gas in the Daikin Aircon compressor to solve the problem. However, the biggest problem is that it may not be a long term solution. Daikin u0 error code occurs for a reason. It could be an indication of gas leakage somewhere in the system. In certain Daikin Aircon models, brand new Daikin aircon may encounter a u0 error code as well without any sign of gas leak. After some experimentation, we find out that u0 error code is due to faulty expansion valve coil. So do note that in rare cases u0 can also be an indication of other error

Gas leakage in Daikin compressor

So what do you do when you encounter a Daikin U0 error code? First, examine how long was the Aircon last installed? If the aircon is only installer several week or less than 3 months ago. Chances are, the u0 error code could be caused by improper joining of the copper pipe. The improper joint may cause gas to leak from there. In addition, the joints occur between the fan coil units and the copper pipe. It also occurs between the copper pipe and the condenser unit. So for a system 3 Daikin Aircon system, there can be as many as 6 joints to check. Moreover, it may not always be the fault of the Aircon technician. Most of the Aircon technician will implement a bubble test to check for Any potential leakage.

However, with the recent implementation of R32 gas in all brand new Aircon system. It is extremely hard to detect bubbles from forming in a bubble test. Thus, this makes the job of an Aircon technician much harder. So if there is a u0 error code after a few weeks of installation. Just get the Aircon installation company to assist. But DO NOT place all the blame on them. Especially if they have done the bubble test. As the current gas type is harder to detect gas leak.

Daikin Aircon units that have just done chemical overhaul

If you have recently done chemical overhaul for your Daikin Aircon unit, Do check if you have any instances of Daikin u0 error code before this. Because if you do not have any u0 error code in the past and this happen only after Chemical overhaul by your Aircon technician. Then there’s a chance the Aircon technician did not join the fancoil with the copper pipe tight enough. And it cause a gas leak in the system. You may wish to get the Aircon company to assist with this to double check. However, at times it can also be that your Aircon condenser or copper piper just happen to have a gas leak after they do the chemical overhaul. Murphy law happens from time to time.

Pressure test

If this is a landed or condo unit and this Aircon is relatively new, you may wish to get an Aircon pressure done for your Aircon system. Basically, the pressure test will test all the copper pipe, fan coil units and condenser unit to see which component is leaking. The pressure test will not be able to tell which part of the fancoil or piping is leaking, It can only tell which set of copper pipe is leaking. For a landed or condominium unit, the most troublesome thing to replace is the Aircon copper pipe. This is because the AIrcon contractor usually needs to cut open the ceiling to replace them. So if you are ding an Aircon pressure test please pray that it is the Aircon condenser or fancoil unit that requires replacement instead. Furthermore, replacement of Aircon copper pipe is usually the most expensive amongst these.