Daikin ductless-mini-split — Daikin split and multi-split systems that publish UA for an indoor and outdoor combination fault Error Codes Directory
Complete diagnostic reference for Daikin ductless-mini-split — Daikin split and multi-split systems that publish UA for an indoor and outdoor combination fault fault codes. Each code includes official root causes, safety precautions, and affected replacement components.
Daikin UA error code: indoor and outdoor unit combination fault
Daikin assigns UA to an improper combination of indoor and outdoor units. The paired models are not compatible, the number of connected indoor units is outside the outdoor unit's limit, the refrigerant types do not match, or a replacement control board was fitted without its combination setting being made. Applies to: Daikin split and multi-split systems that publish UA for an indoor and outdoor combination fault This meaning follows the Daikin malfunction code table for split and multi-split systems that list UA. SkyAir and VRV ranges assign UA-adjacent codes differently, so confirm the outdoor model and every connected indoor model before acting. Owner-safe checks: Note whether UA appeared at first commissioning, after equipment was combined from different kits, or right after a control board was replaced. | Write down the outdoor model and every indoor model with the room it serves, so the installer can check the combination against Daikin's data. Qualified technician: Changing paired equipment, removing indoor units from a multi-split, and making a replacement board's combination setting are all installer or technician tasks.