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knocker.
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TheAChub
Transmission Error between Indoor Units and Outdoor Units
Error Code U4
Applicable Models
All indoor models REYQ-T
Method of Error Detection
Micro-computer checks if transmission between indoor and outdoor units is normal. Error Decision Conditions
When transmission is not carried out normally for a certain amount of time Supposed Causes
Short circuit in indoor-outdoor or outdoor-outdoor transmission wiring (F1 / F2), or wrong wiring Outdoor unit power supply is OFF System address does not match
Defective indoor unit PCB
Defective outdoor unit PCB
knocker
9 out of 10 times it is loss of power to an indoor unit or BS box.
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