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Daikin 4MXL-T Series User Manual

Daikin 4MXL-T Series
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Troubleshooting for SA Indoor Unit SiUS121827E
190 Part 6 Service Diagnosis
6.9 Signal Transmission Error (Between Indoor and Outdoor
Unit)
Error Code U4
Method of Error
Detection
The signal transmission data 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
Power supply voltage out of specification
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

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Daikin 4MXL-T Series Specifications

General IconGeneral
RefrigerantR32
Series4MXL-T
Indoor Unit OptionsWall Mounted, Cassette, Ducted
ControlWi-Fi, Remote Control
Indoor Unit Noise Level19 - 45 dB
Power Supply220-240V, 50Hz
Operating Temperature (Heating)-15°C
Indoor Unit Dimensions (HxWxD)Varies by model (e.g., 295x840x210 mm for wall-mounted)
Indoor Unit WeightVaries by model (e.g., 10 - 20 kg)

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