DAIKIN 20kw ducted system is throwing a U1 fault code.

We did change the power and incorrectly orientated the phases but have rectified this issue but we can’t clear the code to restart the unit.

I have continuity checked all the fuses on the PCB’s and carried out numerous power off resets including one over night but the fault code persist.

I think the indoor controller is just telling the out door unit it has a problem at this point.

Have cleared the fault off the remote but the out door unit still won’t start.

PCB’s don’t have any visible issues.

Any ideas on what to try next?? We really need this thing going as it’s being used for temperature control in a factory.