Daikin FTXN-LV - Error Code U2: DC Voltage Out of Range; Error Code U4: Communication Error (Indoor;Outdoor)

TS13-01 Troubleshooting manual 47
U2
Description
DC voltage out of range
Supposed Cause
- Supply voltage not as specified
- DC voltage detection circuit defective
Troubleshooting
U4
Description
Communication error (between indoor and outdoor)
Supposed Cause
- Faulty outdoor unit PCB
- Faulty indoor unit PCB
- Indoor unit – outdoor unit signal transmission error due to wiring error.
- Indoor unit – outdoor unit signal transmission error due to disturbed power supply
waveform.
- Indoor unit- Outdoor unit signal transmission error due to breaking of wire in the
connection wires between the indoor and outdoor units.
Troubleshooting
Check the supply
voltage
Supply voltage as
specified?
Change outdoor
PCB
Correct the
power supply