Trouble Shooting
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Daikin Trouble Shooting Guide
Past & Current Models
Daikin Fault 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
between outdoor units
Wiring error between outdoor units,
defect of outdoor PCB
• •
U8 Communication failure be-
tween remote controllers
Main/sub switch not set, wiring error,
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
between indoor central device
Wiring error between indoor unit & central
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 •
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