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Maintenance

Daikin Error Codes – Indoor Unit

Ururu Sarara

Simple Self-Diagnosis by Malfunction Code

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Indoor Unit Error Code and ContentsSupposed causesObjects affected
A0
External protection device activated
External protection device connected to the terminal strip
T1-T2 of indoor unit is activated
SkyAir, VRV, Package
A1
Malfunction of indoor unit PCB
Defective indoor unit
PCB External factor (noise etc)
RA, SkyAir, VRV, Heat reclaim ventilator, Chiller
A3
Drain Level Control System
Abnormality
Drain clogging, upward slope, etc
Defective drain pump
Defective float switch or short circuit connector
RA, SkyAir, VRV, Heat reclaim ventilator, Fan coil
A4
Malfunction of freezing protection
Shortage of water volume
Low water temperature setting
Defective water temperature thermistor
RA, SkyAir, VRV, Package, Chiller, Fan coil
A5
High pressure control in heating,
freeze-up protection control in cooling
Clogged air filter of indoor unit and short circuit
Defect of indoor unit heat exchanger thermistor
RA, SkyAir, VRV, Package
A6
Malfunction of fan motor
Broken wires in, short circuit of, or disconnection of
connectors from the fan motor harness
Defective fan motor
Defective indoor unit PCB
RA, SkyAir, VRV, Package, Heat reclaim ventilator
A7
Malfunction of swing flap motor
Defective swing flap motor
Defective indoor unit PCB
Defective connection cable
Defective airflow direction adjusting flap-cam
SkyAir, VRV
A8
Malfunction of power supply or AC input overcurrent
Defective power supply voltage
Defective connection on signal line
Defective wiring
SkyAir, VRV, Heat reclaim ventilator
A9
Malfunction of electronic expansion
valve
Defective electronic expansion valve coil
Defective indoor unit PCB
Defective relay cables
SkyAir, VRV, Package, Heat reclaim ventilator. Chiller
AA
Heater overheat
26WH is activatedPackage, Chiller
AF
Malfunction of humidifier system
Humidifier unit (optional accessory) leaking
Defective drain piping (upward slope, etc.)
Defective indoor unit PCB
SkyAir, VRV, Heat reclaim ventilator
AH
Malfunction of dust collector of air
cleaner
Defect of dust collecting element
Stained insulator part
Defect of high voltage power supply unit
Defect of indoor unit PCB
RA, SkyAir, VRV, Fan coil
AJ
Malfunction of capacity setting
(Indoor unit PCB)
The capacity setting adaptor was not installed when
replacing PCB
Defective indoor unit PCB
SkyAir, VRV, Package
C1
Failure of transmission (between
indoor unit PCB and sub PCB)
Defective connection of the connector between indoor
unit PCB
SkyAir, VRV
C4
Malfunction of liquid pipe
thermistor for heat exchanger
Defective thermistor for liquid pipe
Defective indoor unit PCB
Defective connector contact
RA, SkyAir, VRV, Package, Heat reclaim ventilator, Chiller, Fan coil
C5
Malfunction of gas pipe thermistor
for heat exchanger
Defective thermistor for gas pipe
Defective indoor unit PCB
Defective connector contact
RA, VRV, Package, Heat reclaim ventilator, Chiller
C6
Malfunction of fan motor sensor or
fan control driver
Defective fan PCB
Defective connection of capacity setting adaptor
Field setting error
SkyAir, VRV
C7
Front panel driving motor fault
Defective front panel driving motor
Defective limit switch
RA
C9
Malfunction of suction air
thermistor
Defective thermistor for suction air
Defective indoor unit PCB
Defective connector contact
RA, SkyAir, VRV, Package, Heat reclaim ventilator, Fan coil
CA
Malfunction of discharge air
thermistor
Defective thermistor for discharge air
Defective indoor unit PCB
Defective connector contact
RA, VRV, Package, Heat reclaim ventilator
CC
Malfunction of humidity sensor
system
Defective humidity sensor
Defective connector contact
RA, SkyAir, Package
CJ
Room temperature thermistor in
remote controller abnormality
Defective room temperature thermistor in remote controller
Defective remote controller PCB
External factor (Noise etc.)
RA, SkyAir, VRV, Package, Fan coil
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