Daikin 2MXS-W Series User Manual

Troubleshooting for Wall Mounted/Floor Standing Type SiUS122226E
164 Part 6 Service Diagnosis
5.6 Signal Transmission Error (Between Indoor Unit and
Outdoor Unit)
Error Code U4
Method of Error
Detection
The signal transmission data received from the outdoor unit is checked whether it is normal.
Error Decision
Conditions
The data sent from the outdoor unit cannot be received normally, or the content of the data is
abnormal.
Supposed
Causes
 Reduction of power supply voltage
 Wiring error
 Breaking of the connection wires between the indoor and outdoor units (wire No. 3)
 Defective outdoor unit PCB
 Short circuit inside the fan motor winding
 Defective indoor unit PCB
 Disturbed power supply waveform

Daikin 2MXS-W Series Specifications

General

Brand	Daikin
Model	2MXS-W Series
Category	Air Conditioner
Language	English