Daikin Mini Split AC U-4 Error Fix
0:56
YouTubeForever Tech English
Daikin Mini Split AC U-4 Error Fix
In this video, I diagnose and repair a Daikin mini split air conditioner showing U-4 error, which indicates a serial communication failure between the indoor and outdoor units. The indoor fan starts briefly, the blue LED blinks, and the system shuts down due to loss of communication. Using a multimeter, I perform a step-by-step technical ...
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