Daikin Mini-Split Code UE
Warning
Transmission error between the centralized remote controller and an indoor unit. Communication with the central controller stopped for a set period.
Manual wording: “UE Transmission error between centralized remote controller and indoor unit”
Documented for: Systems using centralized control
Likely causes, most common first
- Transmission error between optional controllers for centralized control and the indoor unit
- Connector for setting master controller is disconnected
- Defective PCB of centralized remote controller
- Defective indoor unit PCB
What you can safely check yourself
- Turn the system off at the breaker or disconnect switch, wait a minute, and turn it back on once
When to call a technician
The manual's step is to reset power to all centralized controllers simultaneously and check the master-controller connector. Leave that to a technician.
A Daikin mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- Service Manual - Multi-Split Type Air Conditioners RMXS-L Series (SiUS181631EA) (Daikin, RMXS48LVJU outdoor, BPMKS048A2U/049A3U branch provider, CTXG/CTXS/FTXS/CDXS/FDXS/FVXS/FFQ indoor units) · checked 2026-08-25