Daikin Error Codes (Malfunction Self-Diagnosis and Troubleshooting)

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Malfunction (Error) code Malfunction Contents Supposed causes Objects
RA SkyAir VRV Package HRV Chiller
Indoor Unit 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 Defect of fan motor
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

Defect of power supply voltage

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 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
Outdoor Unit E4 Actuation of low pressure switch (LPS) 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 fo 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
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

Faulty wiring of inverter system   Defect of outdoor unit PCB

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
Outdoor Unit 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
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
Outdoor Unit 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
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
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 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

Others 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. 2

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
System 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
Others 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

 

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