Daikin Error Codes
System Fault Codes
Fault Code Definition Supposed Causes Split Skyair VRV Package HRV
U0 | Shortage of refrigerant | Undercharged, EEV fault, faulty sensor |
U1 | Reverse or missing phase | Reversed or missing phase |
U2 | Power supply fault | Power supply fault, capacitor wiring error |
U3 | Check operation not executed | Check operation not carried out at commissioning or after main PCB replaced |
U4 | Communication failure, between indoor & outdoor | Wiring fault, defect of PCB, pump wired across communication wiring |
U5 | Communication failure, between r/controller & PCB | Wiring fault, defect of Remote controller & PCB |
U6 | Communication failure between indoor units | Wiring fault, defect of indoor PCB |
U7 | Communication failure, between outdoor PCB’s | Defect of outdoor PCB, wiring error between PCB’s |
U7 Communication failure Wiring error between outdoor units, • • between outdoor units defect of outdoor PCB | ||
U8 Communication failure be- Main/sub switch not set, wiring error, • • • • tween remote controllers defect of remote controller | ||
U9 | System communication failed | Fault with other indoor unit, no power, A9 |
UA | Improper combination | Incorrect field setting, wiring, defect of PCB |
UA | Incorrect field setting Wiring, defective PCB | Field setting incorrect (twin/triple), error in |
UA | Improper combination of Indoor/outdoor units | Excess of indoor units, incorrect PCB Setting, defective PCB |
UC Error in address setting Duplicated central control address • • • • | ||
UE Communication failure Wiring error between indoor unit & central • • • • between indoor central device control, defect of indoor PCB, setting error | ||
UF Wiring/piping mismatch Wiring error indoor to outdoor, PCB defect • • • | ||
UH | System malfunction | Unaddressed indoor unit |
UH | System malfunction | Mismatched indoor/outdoor, freeze protect |
UJ | Communication failure | Defect of accessory device, wiring error |
M1 | Central controller failed | Failure of central controller PCB |
M8 | Communication failure between central & options | Communication failed between central controller & optional controllers |
MA | Improper combination of optional controllers | Incorrect settings, faulty central controller |
MC | Duplicated address | Duplicated central controller address |
60 | Overall alarm | Open circuit across J1-JC |
64 | Failed return air sensor | Sensor open/short circuit |
65 | Failed ambient sensor | Sensor open/short circuit |
6A | Failure of damper system | Defect of damper motor, limit switch, PCB |
Trouble Shooting