Daikin air conditioner u4 error

Daikin air conditioner u4 error

The U4 fault code occurs when there is lack of communication between the printed circuit boards of the indoor and outdoor units.

Try to reset the system by turning off the power. In case whereby it was caused by a power drop, it is likely to start working again.

If there is a more serious malfunction, the system will break down again.

Not unlikely, there is a problem in the outdoor unit or cable connection between the two units.