My Daikin AC keeps failing with error U0-00, how can I stop these continuous breakdowns?

U0-00 on a Daikin almost always means that there isn't enough refrigerant because of a leak or undercharge, and if the unit keeps going, the compressor could get damaged.

Turn off the system and treat this as a job to find leaks, not just a fill-up.

Ask a licensed HVAC technician to test the coils, flare joints, and lines for leaks using nitrogen pressure and UV light. 

Once they find one, they should fix it, then drain the system to a deep vacuum and refill it by weight to the nameplate, making sure there is no superheat or subcool.

Repeat U0 faults happen when gas is added without fixes being made.

Check the exact sub-code with Daikin's error-code check on the remote and in Daikin's world database to make sure. This helps your tech get the right job alerts.

Many people have shared their issues here and found resolutions. If you have one, feel free to reach out to Xolvie.