Daikin Trouble Shooting Guide
Past & Current Models
Daikin Fault Codes
Indoor Fault Codes
Fault Code
A0
A1
A3
A5
A6
A7
A8
A9
AF
AH
AJ
C1
C4
C5
C6
C7
C9
CA
CC
CJ
Definition
External protection active
Failure of indoor PCB
High water level
HP control in heating or freeze
protection in cooling
Fan motor failure
Failure of louvre motor
Failure of power supply
EEV failure
High water level
Failure of dust collector
Capacity setting error
Communication failure. Between
main-sub PCB
Indoor coil sensor
Suction pipe sensor
Failure of fan motor driver
Front panel driving motor fault
Return air sensor fault
Discharge air sensor fault
Failure of humidity sensor
Failure of remote sensor
Supposed Causes
External protection wired to T1-T2 active
Defect of PCB or noise
Float switch open circuit
Poor airflow, short circuit, EEV, refrigerant charge,
indoor coil sensor incorrect value
Locked, over current, over load
Louvre motor/indoor PCB failed
Over current of AC input, defect of supply
Defect of EEV motor, indoor PCB
Float switch open circuit while thermo off
Defect of dust collecting element, PCB
Capacity setting adaptor missing
Failure of communication fan motor
control driver
Open/short circuit
Open/short circuit
Defect of fan motor sensor, control driver
Defect of limit switch, front panel driving motor
Return air sensor open/short circuit
Discharge air sensor open/short circuit
Failed humidity sensor
Defect of remote controller sensor
Split
Supposed Causes
Outdoor safety device tripped
Defect of PCB or noise
High pressure switch tripped
Low pressure switch tripped
Inverter compressor locked
Compressor windings too hot
High current draw
Failed fan motor, PCB
Compressor, PCB
EEV motor, PCB
Defect of valve, PCB, sensor
Abnormal water temperature
Thermal storage EEV, PCB, sensor
Discharge temperature over 110°C
Detected by outdoor coil sensor
Refrigerant over charge
All sensors disconnected
Defect of limit switch/damper
High pressure switch open circuit
Low pressure switch open circuit
Defect of compressor overload sensor
Position detection error
Defect of fan motor, PCB
Defect of transistor, PCB, reactor
Sensor open short circuit
Pressure sensor failed
Defect of current sensor, PCB, compressor
Discharge pipe sensor open/short circuit
Sensor open/short circuit
Sensor open/short circuit
Sensor open/short circuit
Sensor open/short circuit
Sensor open/short circuit
Sensor open/short circuit
High pressure sensor open/short circuit
Low pressure sensor open/short circuit
Open/short circuit
Split
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Skyair
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VRV
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Skyair
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VRV
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Daikin Fault Codes
Outdoor Fault Codes
Definition
Protection devices tripped
Failure of outdoor PCB
High pressure
Low pressure
Inverter compressor lock
Inverter compressor to hot
DOL compressor locked
Fan motor failure
Inv compressor high current
EEV motor failure
4-way valve failure
Inlet water temperature
Thermal storage unit defect
High discharge temperature
High pressure in cooling
Over charged
Compressor sensor system
Failure of humidifier damper
Failure of hp switch
Failure of lp switch
Failure of compressor sensor
Compressor position failure
Failure of fan motor signal
Compressor input error
Failed ambient sensor
Failed pressure sensor
Failed current sensor
Failed discharge pipe sensor
Failed outdoor coil vapour sensor
Failed suction pipe sensor
Failed outdoor coil sensor
Failed liquid pipe sensor
Failed liquid pipe sensor
Failed sub cool heat exchanger sensor
Failed high pressure sensor
Failed low pressure sensor
Failed oil temperature sensor
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Trouble Shooting
Fault Code
E0
E1
E3
E4
E5
E5
E6
E7
E8
E9
EA
EC
EF
F3
F6
F6
H0
H1
H3
H4
H5
H6
H7
H8
H9
J1
J2
J3
J4
J5
J6
J7
J8
J9
JA
JC
JH
Daikin Trouble Shooting Guide
Past & Current Models
Daikin Fault Codes
Outdoor Fault Codes
Fault Code
L0
L1
L3
Definition
Failure of inverter system
Failure of inverter PCB
Electrical box temperature over
120°C when comp’ off
Fin temperature over 93°C
Inverter instantaneous DC over
current
Supposed Causes
Defect power transistor, inverter PCB
Blown fuse, defect of inverter PCB, fan motor
Defect of fan motor, PCB,
power transistor
Failed sensor, short circuit of airflow
Defect of inverter PCB,
compressor lock/windings
L6
Inverter instantaneous AC over
current
Defect of inverter unit,
compressor lock/windings
L8
Over current of inverter compressor Defect of inverter PCB compressor
lock/ windings
Inverter compressor start-up
Defect of inverter PCB compressor
failure
lock/ windings, refrigerant charge
Failure of power transistor
Defect of power transistor, PCB, compressor
Communication fails between PCB Noise, defect of PCB
& micro-computer
L4
L5
L9
LA
LC
Skyair
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LC
Communication fails between
main & inverter PCB
Defect of inverter PCB, main PCB, fan PCB,
noise filter, compressor
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P1
Imbalance of power supply
Open phase, imbalance between phases,
Defect of main capacitor, inverter PCB
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P2
Automatic refrigerant charge
operation stop
Closed stop valve, closed refrigerant cylinder valve
P3
Rise in electrical box temperature
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P4
P8
Failed radiating fin sensor
Coil freeze protection during
Automatic charging
Failure of humidifier fan motor
Automatic charge operation
completed
Broken humidifier heater wire
Refrigerant cylinder empty
Refrigerant cylinder empty
Auto charge nearly completed
Humidifier outlet temperature
sensor/abnormal heater temp’
Capacity not set
Capacity setting error
Defect of fin sensor, PCB, rise in
ambient temperature
Sensor open/short circuit
Close refrigerant cylinder and start again
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Defect of fan motor, PCB
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P9
P9
PA
PA
PC
PE
PH
Trouble Shooting
Split
PJ
PJ
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Blown thermal fuse, broken heater element
Cylinder on master unit empty
Cylinder on slave unit empty
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Sensor open/short circuit, defect of PCB,
defect of heater unit
Capacity setting adaptor not fitted
Incorrect capacity setting
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Daikin Trouble Shooting Guide
Past & Current Models
Daikin Fault Codes
System Fault Codes
Definition
Shortage of refrigerant
Reverse or missing phase
Power supply fault
Check operation not executed
Supposed Causes
Undercharged, EEV fault, faulty sensor
Reversed or missing phase
Power supply fault, capacitor wiring error
Check operation not carried out at
commissioning or after main PCB replaced
Split
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Skyair
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VRV
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Package
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HRV
U4
Communication failure,
between indoor & outdoor
Wiring fault, defect of PCB, pump wired
across communication wiring
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U5
Communication failure,
between r/controller & PCB
Wiring fault, defect of Remote
controller & PCB
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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
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U8
Communication failure between remote controllers
System communication failed
Improper combination
Incorrect field setting
Wiring, defective PCB
Improper combination of
Indoor/outdoor units
Error in address setting
Communication failure
between indoor central device
Wiring/piping mismatch
System malfunction
System malfunction
Communication failure
Central controller failed
Communication failure
between central & options
Improper combination of
optional controllers
Duplicated address
Overall alarm
Failed return air sensor
Failed ambient sensor
Failure of damper system
Main/sub switch not set, wiring error,
defect of remote controller
Fault with other indoor unit, no power, A9
Incorrect field setting, wiring, defect of PCB
Field setting incorrect (twin/triple), error in
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U9
UA
UA
UA
UC
UE
UF
UH
UH
UJ
M1
M8
MA
MC
60
64
65
6A
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Excess of indoor units, incorrect PCB
Setting, defective PCB
Duplicated central control address
Wiring error between indoor unit & central
control, defect of indoor PCB, setting error
Wiring error indoor to outdoor, PCB defect
Unaddressed indoor unit
Mismatched indoor/outdoor, freeze protect
Defect of accessory device, wiring error
Failure of central controller PCB
Communication failed between central
controller & optional controllers
Incorrect settings,
faulty central controller
Duplicated central controller address
Open circuit across J1-JC
Sensor open/short circuit
Sensor open/short circuit
Defect of damper motor, limit switch, PCB
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Trouble Shooting
Fault Code
U0
U1
U2
U3
Daikin Trouble Shooting Guide
Past & Current Models
Fault Code Retrieval with Infra Red
Remote Controller
In the ARC433A series, the temperature display sections on
the main unit indicate corresponding codes.
00
1.When the timer cancel button is held down for
5 seconds, a “00” indication flashes on the temperature
display section.
2.Press the timer cancel button repeatedly until a continuous
beep is produced.
Time
Cancel
Button
• The code indication changes in the sequence shown below
and notifies with a long beep.
No.
1
Code
00
No.
11
Code
E7
No.
21
Code
UA
2
U4
3
F3
12
C7
22
A5
13
H8
23
4
J9
E6
14
J8
24
E8
5
L5
15
A3
25
P4
6
R6
16
A1
26
L3
7
E5
17
C4
27
L4
8
LC
18
C5
28
H6
9
C9
19
H9
29
H7
10
UC
20
J6
30
U2
1.A short beep and two consecutive beeps indicate
non-corresponding codes.
2. To cancel the code display, hold the timer cancel button
down for 5 seconds. The display also cancels itself if the
button is not pressed for 1 minute.
Trouble Shooting
SkyAir, VRV Infra Red Remote Controller
Wireless Controllers – Fault diagnostics
1.Press the Inspection/ Test button to select “Inspection”.
The equipment enters the inspection mode. The “Unit”
indication lights and the Unit No. display shows a flashing
“0” indication.
2. Set the Unit No. by pressing the UP/DOWN button &
change the Unit No. display until a short beep is generated
by the indoor unit.
4
5
6
2
3
1
3. Press the MODE button. The left “0” flashes.
4. Press the UP/DOWN button & change display until 2 short
beeps are heard. First part of fault code.
5. Press the MODE button. The right “0” flashes.
6. Press the UP/DOWN button & change the display until
1 short beep is heard or a continuous beep is heard
indicating both digits match the fault code.
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