Daikin U4 Fault
Hi everyone,
Does anyone have a Daikin fault code list they could share?
I’m currently dealing with a U4 fault and would really appreciate any advice or information on how to fix it.
I have attached an image for reference
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U4 – System Transmission Fault
The fault indicates a communication issue between indoor units. Based on the ability to retrieve the code, I suspect a possible outdoor PCB failure. However, the interconnecting wiring should also be checked to rule out any loose connections or damage.
For reference, I have attached a PDF listing the full set of Daikin fault codes.
Let me know what you find