How to fix Daikin u4 error
🔧 Daikin AC U4 Error | Causes, Meaning & Complete Fix Guide
In this video, we explain Daikin AC U4 Error Code in simple words and show how to fix it step by step.
🔹 What does U4 Error mean?
Daikin U4 Error indicates a communication failure between the indoor unit and the outdoor unit. When both units cannot send or receive signals properly, the air conditioner stops working for safety reasons.
🔹 Common causes of Daikin U4 Error:
✔ Loose or disconnected communication wiring
✔ Cut, burnt, or damaged signal wire
✔ Wrong terminal connection
✔ Indoor PCB or Outdoor PCB fault
✔ Power supply or voltage issue
🔹 What you will learn in this video:
✅ How to identify U4 Error correctly
✅ How to check communication wiring
✅ How to test power supply and terminals
✅ How to know if the PCB is faulty
✅ Basic troubleshooting before calling a technician
⚠ Important Note:
If wiring and power supply are OK and the U4 error still appears, PCB repair or replacement may be required. Always turn off power before checking connections.
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