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Daikin Troubleshooting

List of Daikin Aircon Error Codes

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In this complete Daikin error code guide, we’ll show you the different codes and possible causes affecting Daikin indoor and outdoor units — and how you can use them to diagnose and repair common aircon problems in an instant.


Indoor Unit Error Codes

Error Code Description Possible Cause Objects
RA SkyAir VRV Package HRV Chiller
A0 External protection device activated External protection device connected to the terminal strip T1-T2 of indoor unit is activated
A1 Malfunction of indoor unit PCB Malfunction due to noise Defect of indoor unit PCB
A3 Malfunction of drain level control system Drain piping clogging, improper drain piping work Defect of drain pump Defect of float switch
A4 Malfunction of freezing protection Shortage of water volume Low water temperature setting Defect of 26WL Defect of water temperature thermistor
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
A6 Fan motor locked, overload, overcurrent Defect of connector contact Defect of indoor unit PCB
A7 Malfunction of swing flap motor Failure of swing flap motor Defect of indoor unit PCB Jammed swing mechanism/blade
A8 Malfunction of power supply Overcurrent of AC input
A9 Malfunction of electronic expansion valve drive Defect of electronic expansion valve coil
Defect of indoor unit PCB
Defect of connector contact
AA Heater overheat 26WH is activated
AF Malfunction of a humidifier system Water leakage of humidifier (option)
Failure of swing float switch
Improper drain piping incline
AH Malfunction of dust collector of air cleaner Defect of dust collecting element
Defect of high voltage power supply unit
Stained insulator part Defect of indoor unit PCB
AJ Malfunction of capacity setting (Indoor unit PCB) Capacity setting adaptor is not installed when replacing PCB Defect of indoor unit PCB
C1 Failure of transmission (between indoor unit PCB and fan PCB) Defect of transmission of fan motor control driver
C4 Malfunction of liquid pipe thermistor for heat exchanger Defect of connector contact
Defect of liquid pipe thermistor for heat exchanger
C5 Malfunction of gas pipe thermistor for heat exchanger Defect of connector contact
Defect of gas pipe thermistor for heat exchanger
C6 Malfunction of fan motor control driver Defect of fan motor sensor system
Defect of fan motor control driver
C7 Front panel driving motor fault Defect of front panel driving motor
Defect of limit switch
C9 Malfunction of suction air thermistor Defect of connector contact Defect of thermistor for suction air
CA Malfunction of discharge air thermistor Defect of connector contact
Defect of thermistor for discharge air
CC Malfunction of humidity sensor system Defect of connector contact
Defect of humidity sensor
CJ Malfunction of thermostat sensor in remote controller Defect of remote controller thermistor
Malfunction due to noise
Defect of remote controller PCB

Outdoor Unit Error Codes

Error Code Description Possible Cause Objects
RA SkyAir VRV Package HRV Chiller
E0 Protection devices actuated (unified) Protection device connected to outdoor PCB actuated
Defect of protection device connector contact
E1 Defect of outdoor unit PCB Malfunction due to noise
Defect of outdoor unit PCB
E3 Actuation of high pressure switch (HPS) Dirty outdoor unit heat exchanger and suction filter
Defect of HPS Clogged refrigerant piping
Defect of connector contact
E3 System No.1
Actuation of high pressure switch (HPS)
Dirty outdoor unit heat exchanger
Clogged refrigerant piping
Defect of HPS
Shortage of water volume
Defect of connector contact
E4 Actuation of low pressure switch (LPS) Clogged refrigerant piping
Shortage of gas
Defect of connecting connector
Defect of outdoor unit PCB
Clogged refrigerant piping
Shortage of gas
Defect of connecting connector
Defect of outdoor unit PCB
E5 Overheat of inverter compressor motor Shortage of refrigerant amount
Defect of connector contact
Leakage of four way valve
E5 Inverter compressor motor lock Inverter compressor lock
Incorrect wiring
E6 STD compressor motor overcurrent/lock Closed stop valve STD compressor lock
E6 System No.1 Compressor overcurrent Defect of EXP. valve
Defect of compressor
Shortage of refrigerant amount
E7 Malfunction of outdoor unit fan motor Faulty contact of fan motor connector
Defect of fan motor
Defect of fan motor driver
E8 Overcurrent of inverter compressor Defect of compressor
Defect of outdoor unit PCB
Defect of inverter main circuit capacitor
Defect of power transistor
E9 Malfunction of electronic expansion valve coil Defect of electronic expansion valve
Defect of connector contact
Defect of outdoor unit PCB
EA Malfunction of four way valve Defect of four way valve
Defect of outdoor unit PCB
Shortage of gas
Defect of thermistor
EC Malfunction of entering water temperature Malfunction of cooling water temperature
Defect of thermistor
Defect of outdoor unit PCB
EF Malfunction of thermal storage unit Defect of electronic expansion valve of thermal storage unit
Defect of thermal storage PCB
F3 Malfunction of discharge pipe temperature Shortage of gas
Defect of connector contact
Clogged refrigerant piping
Defect of discharge pipe thermistor
F6 Abnormal high pressure in cooling Defect of outdoor unit fan motor
Defect of electronic expansion valve
Defect of heat exchanger thermistor Defect of outdoor unit PCB
F6 Refrigerant overcharged Refrigerant overcharged
Disconnection of heat exchanger thermistor
Disconnection of outdoor air thermistor
Disconnection of liquid pipe thermistor

Error Code Description Possible Cause Objects
RA SkyAir VRV Package HRV Chiller
H0 Malfunction of sensor system of compressor Harness is disconnected, or defective connection Defect of PCB
H1 Malfunction of humidifier unit damper Defect of limit switch
Defect of damper
H3 Malfunction of high pressure switch (HPS) Defect of high pressure switch
Broken wire
Defect of connector contact
Defect of outdoor unit PCB
H4 Malfunction of low pressure switch (LPS) Defect of low pressure switch
Broken wire
Defect of connector contact
Defect of outdoor unit PCB
H5 Malfunction of compressor motor overload thermistor Defect of connector contact
Defect of compressor motor overload thermistor
H6 Malfunction of position detection sensor Faulty contact of compress or cable
Defect of compressor
Defect of outdoor unit PCB
H7 Malfunction of outdoor fan motor signal Faulty contact of fan wiring
Defect of fan motor driver
Defect of fan motor
H8 Malfunction of compressor input (CT) system Defect of power transistor
Defect of reactor
H9 Malfunction of outdoor air thermistor Defect of connector contact
Defect of thermistor for outdoor air
HC Malfunction of (hot) water temperature thermistor Defect of connector contact
Defect of outdoor unit PCB
Defect of thermistor for water temperature
HF Alarm in thermal storage unit with ice Thermal storage group defective wiring
Defect of setting
Excess of thermal storage tank numbers
HJ Malfunction of thermal storage tank water level Low water level
Defect of switch setting
Water level detecting sensor failure
Defect of connector contact
J1 Malfunction of pressure sensor Defect of pressure sensor connector contact
Defect of pressure sensor
Defect of outdoor unit PCB
J2 Malfunction of current sensor of compressor Defect of current sensor
Defect of outdoor unit PCB
Defect of compressor
J3 Malfunction of discharge pipe thermistor Defect of connector contact
Defect of outdoor unit PCB
Defect of discharge pipe thermistor
J4 Malfunction of low pressure equivalent saturated temperature sensor system Defect of connector contact
Defect of thermistor
Defect of outdoor unit PCB (Multi-split, Super-multi )
J5 Malfunction of suction pipe thermistor Defect of connector contact
Defect of outdoor unit PCB
Defect of suction pipe thermistor
J6 Malfunction of heat exchanger thermistor Defect of connector contact
Defect of outdoor unit PCB
Defect of heat exchanger thermistor
J7 Malfunction of liquid pipe thermistor (Refrigerant circuit and others) Defect of connector contact
Defect of outdoor unit PCB
Defect of liquid pipe thermistor
J8 Malfunction of liquid pipe thermistor (Refrigerant circuit and others) Defect of connector contact
Defect of outdoor unit PCB
Defect of liquid pipe thermistor
J9 Malfunction of gas pipe thermistor (Refrigerant circuit and others) Defect of connector contact
Defect of outdoor unit PCB
Defect of gas pipe thermistor
JA Malfunction of high pressure sensor Defect of connector contact
Defect of outdoor unit PCB
Defect of high pressure sensor
JC Malfunction of low pressure sensor Defect of connector contact
Defect of outdoor unit PCB
Defect of low pressure sensor
JE Malfunction of sub-tank thermistor Defect of connector contact
Defect of outdoor unit PCB
Defect of sub-tank thermistor
JF Malfunction of heating thermistor for heat exchanger Defect of connector contact
Defect of outdoor unit PCB
Defect of heat exchanger thermistor
JH Malfunction of oil temperature thermistor Defect of connector contact
Defect of outdoor unit PCB
Defect of oil temperature thermistor

Error Code Description Possible Cause Objects
RA SkyAir VRV Package HRV Chiller
L0 Malfunction of inverter system Shortage of power supply capacity
Defect of inverter PCB
Defect of power transistor
L1 Malfunction of inverter PCB Defect of compressor wiring Blown fuse
Defect of outdoor unit fan motor
Defect of inverter PCB
L3 Electrical box temperature rise Fin temperature rise due to short-circuit
Defect of power transistor
Defect of outdoor unit fan
Defect of outdoor unit PCB
L4 Malfunction of inverter radiating fin temperature rise Fin temperature rise due to short-circuit Defect of fin thermistor
L5 Inverter instantaneous overcurrent (DC) Closed stop valve Defect of compressor
L6 Inverter instantaneous overcurrent (AC) Overcharge of refrigerant amount
Defect of compressor
Shortage of power supply capacity
Defect of inverter unit
L8 Overcurrent of inverter compressor Abnormal high pressure rise due to clogged refrigerant circuit and others
Defect of compressor
L9 Malfunction of inverter compressor startup Faulty of pressure equalization
Defect of compressor wiring
Defect of compressor
LA Malfunction of power transistor Defect of power transistor
Defect of inverter PCB
Defect of compressor
LC Malfunction of transmission between outdoor unit PCB and micro-computer Defect of grounding connection
Defect of outdoor unit PCB
Malfunction due to noise
LC Malfunction of transmission between control and inverter PCB Defect of connector contact
Defect of inverter PCB
Malfunction due to noise
Defect of outdoor unit control PCB
P0 Shortage of refrigerant amount (thermal storage unit) Shortage of refrigerant
Clogged refrigerant piping
P1 Power voltage imbalance, open phase Open phase
Voltage imbalance between phases
Faulty main circuit capacitor
Defect of wiring contact
P2 Automatic refrigerant charge operation stop Closed stop valve
Closed valve of refrigerant tank
P3 Malfunction of thermistor in electrical box Electrical box temperature rise (ambient temperature rise)
Defect of fin thermistor
Defect of outdoor unit PCB
P4 Malfunction of radiating fin temperature sensor Defect of radiating fin thermistor
Defect of wiring contact
Defect of outdoor unit PCB
P8 Heat exchanger freezing protection during automatic refrigerant charging (Close the refrigerant cylinder. Start again from step 1.)
P9 Malfunction of fan motor (humidifier unit) Defect of fan motor Broken relay harness
Defect of outdoor unit PCB
Defect of connector contact
P9 Automatic refrigerant charge operation completed N/A
PA Broken wire of heater (humidifier unit) Defect of heater unit
Defect of outdoor unit PCB
Defect of thermistor
PA Empty refrigerant cylinder during automatic refrigerant charging Refrigerant cylinder of master unit is empty
PC Empty refrigerant cylinder during automatic refrigerant charging Refrigerant cylinder of slave unit 2 is empty
PE Automatic refrigerant charge operation nearly completed N/A
PH Malfunction of temperature (humidifier unit) Defect of heater unit
Defect of thermistor
Defect of connector contact
Defect of outdoor unit PCB
PH Empty refrigerant cylinder during automatic refrigerant charging Refrigerant cylinder of slave unit 1 is empty
PJ Malfunction of capacity setting (Outdoor unit PCB) Capacity setting adaptor is not installed
Improper capacity setting adaptor
Defect of outdoor unit PCB
PJ Improper combination between inverter and fan driver Mistake of inverter PCB
Mistake of control PCB
Mistake of inverter fan PCB

System Error Codes

Error Code Description Possible Cause Objects
RA SkyAir VRV Package HRV Chiller
U0 Shortage of refrigerant Shortage of refrigerant
Closed stop valve
Clogged refrigerant piping
U1 Reverse phase, open phase Reverse phase
Open phase of power wiring
Wrong wiring
Defect of outdoor unit PCB
U2 Defect of power supply voltage or instantaneous power failure Defect of power supply voltage
Instantaneous power failure
Defect of wiring contact
U3 Check operation not executed Check operation not executed
U3 Malfunction of transmission Malfunction due to noise
Defect of outdoor unit PCB
Wrong wiring
U4 Malfunction of transmission between indoor and outdoor unit Defect or indoor-outdoor transmission wiring
Malfunction due to noise
Defect of indoor unit PCB and outdoor unit PCB
U5 Malfunction of transmission between indoor unit and remote controller Defect of remote controller wiring
Defect of indoor unit PCB
Malfunction due to noise
Defect of remote controller main/sub setting
U6 Malfunction of transmission between indoor units Faulty wiring
Defect of indoor unit PCB
Malfunction due to noise
U7 Malfunction of transmission between main body micro-computer – INV micro-computer Harness disconnection/broken wire between PCB
Defect of outdoor unit PCB
U7 Malfunction of transmission between outdoor units Defect of wiring between outdoor units
Defect of outdoor unit switch setting
Defect of wiring between outdoor – thermal storage units
U8 Malfunction of transmission between remote controllers Defect of remote controller main/sub setting
Defect of remote controller wiring
Defect of remote controller PCB
U9 Malfunction of transmission (other system) Defect of communication between other indoor unit and outdoor unit
Other indoor unit electronic expansion valve failure
UA Defect of indoor/outdoor power supply Wrong model connections
Wrong PCB connected
Improper power supply
Defect of PCB
UA Malfunction of field setting Malfunction of field setting by remote controller
Defect of remote controller wiring
Defective connection of optional device
Defect of indoor unit PCB
UA Improper combination of indoor and outdoor units Excess of connected indoor units
Malfunction of field setting
Uncanceled service mode
Defect of outdoor unit PCB
UA Remote temperature setting wire disconnection Remote temperature setting wire disconnection
Defect of connector contact
UC Malfunction of setting of centralized controller address Address duplication of centralized controller
UE Malfunction of transmission between indoor unit and centralized controller Malfunction of wiring between indoor unit and centralized controller
Defect of setting of group number
Defect of indoor unit PCB
UF Wiring and piping mismatch Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor units
UH Malfunction of system Improper connection of transmission wiring between indoor- outdoor units and outdoor-outdoor units
Defect of indoor and outdoor unit PCB (RA: Mismatching indoor and outdoor units)
Defect of voltage
Freeze protection in other indoor unit
(k)
UJ Malfunction of transmission (Accessory devices) Defect of accessory devices
Faulty wiring
M1 Malfunction of centralized remote controller PCB Defect of centralized remote controller PCB
M8 Malfunction of transmission between optional controllers for centralized control Other centralized control power disconnection
Centralized control reset switch ON
Defect of transmission wiring
Central remote controller address change
MA Improper combination of optional controllers for centralized control Improper combination of optional controllers for centralized control
More than one master controller is connected
Faulty setting of centralized control Defect of centralized control
MC Address duplication, improper setting Address duplication of central remote controller

Other Error Codes

Error Code Description Possible Cause Objects
HRV Chiller
77 System No. 1
Malfunction of fan inter lock
Defect of relay contact Broken wire
78 System No. 2
Malfunction of fan inter lock
Defect of relay contact Broken wire
7A System No. 2
Malfunction of current sensor of compressor
Defect of current sensor
Defect of compressor
Defect of outdoor unit PCB
7C System No. 2
Malfunction of pump inter lock
Cooling water pump interlock actuated
80 Malfunction of entering water temperature thermistor Defect of connector contact
Defect of entering water temperature thermistor
81 Malfunction of leaving water temperature thermistor Defect of connector contact
Defect of leaving water temperature thermistor
82 System No. 1
Malfunction of refrigerant thermistor
Defect of connector contact
Defect of refrigerant thermistor
83 System No. 2
Malfunction of refrigerant thermistor
Defect of connector contact
Defect of refrigerant thermistor
84 System No. 1
Malfunction of heat exchanger thermistor
Defect of connector contact
Defect of heat exchanger thermistor
85 System No. 2
Malfunction of heat exchanger thermistor
Defect of connector contact
Defect of heat exchanger thermistor
86 System No. 2
Malfunction of discharge pipe thermistor
Defect of connecting connector
Defect of discharge pipe thermistor
88 System No. 2
Malfunction of discharge pipe temperature
Shortage of gas
Defect of discharge pipe thermistor
Defect of connector contact
Clogged refrigerant piping
89 Malfunction of brazed-plate heat exchanger freezing Dirty heat exchanger
Shortage of refrigerant amount Defect of thermistor
8A System No. 2
Malfunction of leaving water temperature thermistor
Defect of connector contact
Defect of leaving water temperature thermistor
8E System No. 1
Malfunction of suction pipe thermistor 1 for heating
Defect of connector contact
Defect of suction pipe thermistor
8F System No. 1
Malfunction of suction pipe thermistor 2 for heating
Defect of connector contact
Defect of suction pipe thermistor
8H Abnormal high hot water temperature Three-way valve malfunction
Defect of thermistor
Defect of water temperature setting
90 Abnormal chilled water quantity, abnormal AXP Shortage of water volume
Disconnection of AXP
91 System No. 2
Malfunction of electronic expansion valve
Defect of connector contact
Defect of electronic expansion valve coil
92 System No. 2
Malfunction of suction pipe thermistor
Defect of connector contact
Defect of suction pipe thermistor
94 Malfunction of transmission (between heat reclaim ventilation unit and fan unit) Defect of fan unit PCB
Defect of connecting wire between (1) and (2)
95 System No. 1
Malfunction of inverter system
Defect of fan inverter unit
96 System No. 1
Malfunction of inverter system
Defect of fan inverter unit
97 Malfunction of thermal storage unit Defect of thermal storage unit
98 Malfunction of thermal storage brine pump Actuation of thermal storage brine pump overcurrent (OC)
99 Malfunction of thermal storage brine tank Low water level of thermal storage brine tank
60 External protection device actuated Actuation of external protection device
Defect of output signal wiring
Defect of control PCB
64 Malfunction of indoor air thermistor Defect of connecting connector
Defect of thermistor for indoor air
Defect of control PCB
65 Malfunction of outdoor air thermistor Defect of connector contact
Defect of control PCB
Defect of outdoor air thermistor
6A Malfunction of damper system Defect of connector contact
Defect of damper motor
Defect of limit switch
Defect of control PCB
70 System No. 2 Compressor overload Shortage of refrigerant amount
Defect of connector contact
Leakage of four way valve
71 System No. 2 Compressor overcurrent Shortage of refrigerant amount
Short-circuit
Defect of compressor
72 System No. 2
Fan motor overcurrent
Defect of fan motor connector contact
Defect of fan motor
Defect of PCB
73 System No. 2
Malfunction of high pressure (HPS) actuated
Dirty heat exchanger
Clogged refrigerant piping
Defect of HPS
Shortage of water volume
Defect of connector contact
74 System No. 2
Malfunction of low pressure switch (LPS)
Clogged refrigerant piping
Shortage of gas
Defect of connector contact
Defect of LPS
75 System No. 2
Malfunction of low pressure sensor
Defect of connector contact
Defect of PCB
Defect of low pressure sensor
76 System No. 2
Malfunction of high pressure sensor
Defect of connector contact
Defect of PCB
Defect of high pressure sensor

Also read: Troubleshooting Fujitsu Common Error Codes and AC Problems

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