Daikin Error Codes

Select an error code below to identify the problem and find the solution.

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Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.

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139 published codes

List all error code index

60 — Heat Reclaim Ventilator

External protection device activated (Heat reclaim ventilator).

64 — Heat Reclaim Ventilator

Malfunction of indoor air thermistor (Heat reclaim ventilator).

65 — Heat Reclaim Ventilator

Malfunction of outdoor air thermistor (Heat reclaim ventilator).

94 — Heat Reclaim Ventilator

Malfunction of transmission (between heat reclaim ventilator and fan unit).

A1 — Heat Reclaim Ventilator

Malfunction of indoor unit PCB.

A3 — Heat Reclaim Ventilator

Drain Level Control System Abnormality.

A6 — Heat Reclaim Ventilator

Malfunction of fan motor.

C4 — Heat Reclaim Ventilator

Malfunction of liquid pipe thermistor for heat exchanger.

C5 — Heat Reclaim Ventilator

Malfunction of gas pipe thermistor for heat exchanger.

C9 — Heat Reclaim Ventilator

Malfunction of suction air thermistor.

CA — Heat Reclaim Ventilator

Malfunction of discharge air thermistor.

P9 — Heat Reclaim Ventilator

Automatic refrigerant charge operation completed.

U1 — Heat Reclaim Ventilator

Reverse phase, open phase.

U3 — Heat Reclaim Ventilator

Indicates the mandatory commissioning check operation (test run) was never completed after installation or a system reset, or…

U4 — Heat Reclaim Ventilator

Malfunction of transmission between indoor and outdoor unit.

UA — Heat Reclaim Ventilator

Remote temperature setting wire disconnection.

A8 — Heat Reclaim Ventilator

Power supply fault or AC input overcurrent detected on the heat reclaim ventilator's control PCB.

A9 — Heat Reclaim Ventilator

Malfunction of electronic expansion valve.

AF — Heat Reclaim Ventilator

Malfunction of a humidifier system.

U8 — Heat Reclaim Ventilator

Malfunction of transmission between remote controllers.

UC — Heat Reclaim Ventilator

Signals that the address set on a piece of centralized control equipment (central remote controller, schedule timer, or similar)…

UE — Heat Reclaim Ventilator

Malfunction of transmission between indoor unit and centralized control equipment.

UF — Heat Reclaim Ventilator

System is not set yet.

6A — Heat Reclaim Ventilator

Malfunction of damper system (Heat reclaim ventilator).

70 — Chiller

System No.

71 — Chiller

System No.

72 — Chiller

The condenser fan motor circuit for System No.

73 — Chiller

System No.

74 — Chiller

System No.

75 — Chiller

System No.

76 — Chiller

System No.

77 — Chiller

System No.

78 — Chiller

System No.

80 — Chiller

Malfunction of entering water temperature thermistor.

81 — Chiller

Malfunction of leaving water temperature thermistor or drain pipe heater.

82 — Chiller

System No.

83 — Chiller

System No.

84 — Chiller

System No.

85 — Chiller

System No.

86 — Chiller

System No.

88 — Chiller

System No.

89 — Chiller

Malfunction of brazed-plate heat exchanger freezing.

90 — Chiller

Abnormal chilled water quantity or abnormal AXP.

91 — Chiller

System No.

92 — Chiller

System No.

95 — Chiller

System No.

96 — Chiller

System No.

97 — Chiller

Reports a general fault or alarm relayed from the thermal (ice/brine) storage unit's own controller to the chiller — typically a…

98 — Chiller

Malfunction of thermal storage brine pump.

99 — Chiller

Reports a low water (brine) level condition detected in the thermal storage tank, typically by a float switch or level sensor…

A1 — Chiller

Malfunction of indoor unit PCB.

A4 — Chiller

Malfunction of freezing protection.

C4 — Chiller

Malfunction of liquid pipe thermistor for heat exchanger.

C5 — Chiller

Reports an open, shorted, or out-of-range reading from the gas-side (suction/discharge gas) thermistor mounted on the indoor or…

E1 — Chiller

Defective outdoor unit PCB.

E3 — Chiller

System No.

E5 — Chiller

Signals that an inverter-driven compressor has either stalled or lost synchronism, or that its inverter module temperature has…

E6 — Chiller

System No.

E7 — Chiller

Reports a general fault in the outdoor/condenser fan motor circuit — most often the fan failing to start, rotate, or reach…

E8 — Chiller

Overcurrent of inverter compressor.

F3 — Chiller

Malfunction of discharge pipe temperature.

H0 — Chiller

Indicates the control has detected an abnormality in the compressor's general sensor/feedback wiring harness — typically a broken…

H1 — Chiller

Malfunction of room temperature sensor or humidifier unit damper.

H3 — Chiller

Reports that the high pressure switch circuit itself has failed open, shorted, or lost continuity — a wiring or hardware fault in…

H5 — Chiller

Malfunction of compressor motor overload thermistor.

H6 — Chiller

Malfunction of position detection sensor.

H8 — Chiller

Malfunction of compressor input (CT) system.

H9 — Chiller

Malfunction of outdoor air thermistor.

J2 — Chiller

Reports a fault in the current sensor (CT) monitoring compressor amperage on System No.

J3 — Chiller

Malfunction of discharge pipe thermistor.

J6 — Chiller

Malfunction of heat exchanger thermistor.

J8 — Chiller

Reports an open, shorted, or out-of-range reading from the liquid-line refrigerant thermistor on the outdoor/compressor side of…

J9 — Chiller

Reports an open, shorted, or out-of-range reading from the gas-line (suction/discharge) refrigerant thermistor on the…

L3 — Chiller

El.

L4 — Chiller

Malfunction of inverter radiation fin temperature rise.

L5 — Chiller

nverter instantaneous overcurrent (DC output).

L8 — Chiller

Malfunction of overcurrent inverter compressor.

LC — Chiller

Malfunction of transmission between control and inverter PCB.

P3 — Chiller

Malfunction of thermistor in switch box.

P4 — Chiller

Malfunction of radiation fin temperature sensor.

U0 — Chiller

Shortage of refrigeran.

U1 — Chiller

Reverse phase, open phase.

U2 — Chiller

Malfunction of power supply or instantaneous power failure.

U3 — Chiller

Indicates that the initial check (test run) operation required after installation or a control reset has not been completed, so…

U4 — Chiller

Malfunction of transmission between indoor and outdoor unit.

U5 — Chiller

Malfunction of transmission between indoor unit and remote controller.

U7 — Chiller

Malfunction of transmission between outdoor units or outdoor storage unit.

UA — Chiller

Improper combination of indoor and outdoor units.

UJ — Chiller

Malfunction of transmission (accessory device).

A9 — Chiller

Malfunction of electronic expansion valve.

E0 — Chiller

Protection devices activated (unified).

E4 — Chiller

Actuation of low pressure switch (LPS).

E9 — Chiller

Malfunction of electronic expansion valve coil.

H4 — Chiller

Malfunction of low pressure switch (LPS).

H7 — Chiller

Malfunction of outdoor unit fan motor signal.

HC — Chiller

Reports an open, shorted, or out-of-range reading from the thermistor monitoring hot water temperature on units equipped with a…

J1 — Chiller

Reports a fault on the refrigerant pressure sensor feeding the chiller's control logic — typically a signal outside the expected…

J5 — Chiller

Malfunction of suction pipe thermistor.

J7 — Chiller

Malfunction of thermistor (Refrigerant circuit).

JA — Chiller

Malfunction of high pressure sensor.

JC — Chiller

Malfunction of low pressure sensor.

L1 — Chiller

Indicates the inverter control PCB itself has detected an internal fault — commonly a blown fuse, a failed power module, or a…

L9 — Chiller

Malfunction of inverter compressor startup error (Stall prevention).

P1 — Chiller

Power voltage imbalance or inverter PCB.

P2 — Chiller

Automatic refrigerant charge operation stop.

PJ — Chiller

Improper combination between inverter and fan driver.

U8 — Chiller

Reports a communication failure specifically between two or more remote controllers wired to the same indoor/chiller control…

U9 — Chiller

Malfunction of transmission (other system).

UC — Chiller

Indicates two or more centralized control devices — such as central remote controllers, schedule timers, or centralized…

UE — Chiller

Malfunction of transmission between indoor unit and centralized control equipment.

J4 — Chiller

Malfunction of low pressure equivalent saturated temperature sensor system.

L0 — Chiller

Malfunction of inverter system.

L6 — Chiller

Inverter instantaneous overcurrent (AC output).

LA — Chiller

Malfunction of power transistor.

P0 — Chiller

Shortage of refrigerant amount (thermal storage unit).

U6 — Chiller

Reports a lost or corrupted communication link between two or more indoor-side terminal units sharing the same chiller system —…

AA — Chiller

The auxiliary or crankcase/water heater's thermal protector (relay 26WH) has opened due to excessive heater temperature, and the…

7A — Chiller

System No.

7C — Chiller

System No.

8A — Chiller

System No.

8E — Chiller

System No.

8F — Chiller

System No.

8H — Chiller

Abnormal hot water high temperature.

A1 — Split & Multi-Split

Malfunction of indoor unit PCB.

A3 — Split & Multi-Split

A3 flags a fault in the indoor unit's drain level control system — the float switch or drain pump has detected water rising above…

A4 — Split & Multi-Split

Malfunction of freezing protection.

A5 — Split & Multi-Split

High pressure control in heating, freeze-up protection control in cooling.

A6 — Split & Multi-Split

Malfunction of fan motor.

AH — Split & Multi-Split

Malfunction of dust collector of air cleaner.

C4 — Split & Multi-Split

Malfunction of liquid pipe thermistor for heat exchanger.

C5 — Split & Multi-Split

C5 indicates the indoor unit's gas-side (suction/discharge) heat exchanger thermistor has failed open, shorted, or is reading out…

C7 — Split & Multi-Split

C7 is a mechanical fault in the front panel's swing/opening drive motor or its limit switch, distinct from every refrigerant- or…

C9 — Split & Multi-Split

Malfunction of suction air thermistor.

CA — Split & Multi-Split

Malfunction of discharge air thermistor.

CC — Split & Multi-Split

Malfunction of humidity sensor system.

CJ — Split & Multi-Split

Room temperature thermistor in remote controller abnormality.

E1 — Split & Multi-Split

Defective outdoor unit PCB.

E3 — Split & Multi-Split

Actuation of high pressure switch (HPS).

E5 — Split & Multi-Split

Inverter compressor motor or overheat.

E6 — Split & Multi-Split

STD compressor motor overcurrent/lock.

E7 — Split & Multi-Split

E7 — the outdoor fan motor has stalled, can't reach commanded speed, or lost feedback signal.

E8 — Split & Multi-Split

E8 is an overcurrent trip on the inverter compressor, detected when the outdoor PCB or inverter measures current draw beyond safe…

EA — Split & Multi-Split

Malfunction of four way valve or cool/heat switchin.

F3 — Split & Multi-Split

Malfunction of discharge pipe temperature.

F6 — Split & Multi-Split

Abnormal high pressure or refrigerant overcharged.

H0 — Split & Multi-Split

Malfunction of sensor system of compressor.

H1 — Split & Multi-Split

Malfunction of room temperature sensor or humidifier unit damper.

H3 — Split & Multi-Split

H3 fires when the high pressure switch (HPS) circuit itself is found faulty — an open circuit, broken wire, or bad connector — as…

H5 — Split & Multi-Split

Malfunction of compressor motor overload thermistor.

H6 — Split & Multi-Split

Malfunction of position detection sensor.

H8 — Split & Multi-Split

Malfunction of compressor input (CT) system.

H9 — Split & Multi-Split

Malfunction of outdoor air thermistor.

HJ — Split & Multi-Split

Malfunction of thermal storage tank water level.

J2 — Split & Multi-Split

Malfunction of current sensor of compressor.

J3 — Split & Multi-Split

Malfunction of discharge pipe thermistor.

J6 — Split & Multi-Split

J6 covers a failed outdoor unit heat exchanger thermistor — the sensor that tracks the outdoor coil's refrigerant temperature for…

J8 — Split & Multi-Split

Malfunction of thermistor (Refrigerant circuit).

J9 — Split & Multi-Split

Malfunction of thermistor (Refrigerant circuit).

L3 — Split & Multi-Split

El.

L4 — Split & Multi-Split

Malfunction of inverter radiation fin temperature rise.

L5 — Split & Multi-Split

nverter instantaneous overcurrent (DC output).

L8 — Split & Multi-Split

Malfunction of overcurrent inverter compressor.

LC — Split & Multi-Split

Malfunction of transmission between control and inverter PCB.

M1 — Split & Multi-Split

Malfunction of central remote controller PCB.

M8 — Split & Multi-Split

Malfunction of transmission between optional controllers for centralized control.

MA — Split & Multi-Split

Improper combination of optional controllers for centralized control.

MC — Split & Multi-Split

Address duplication, improper setting.

P3 — Split & Multi-Split

Malfunction of thermistor in switch box.

P4 — Split & Multi-Split

Malfunction of radiation fin temperature sensor.

P9 — Split & Multi-Split

Malfunction of fan motor (humidifier unit).

PA — Split & Multi-Split

PA indicates a broken or open heater element circuit within the humidifier unit accessory occasionally paired with Daikin split…

PH — Split & Multi-Split

Refrigerant cylinder during automatic refrigerant charging.

U0 — Split & Multi-Split

Shortage of refrigeran.

U1 — Split & Multi-Split

Reverse phase, open phase.

U2 — Split & Multi-Split

Malfunction of power supply or instantaneous power failure.

U3 — Split & Multi-Split

Check operation not executed or transmission error.

U4 — Split & Multi-Split

Malfunction of transmission between indoor and outdoor unit.

U5 — Split & Multi-Split

U5 covers a transmission failure between the indoor unit and its wired remote controller, meaning the fault is isolated to the…

U7 — Split & Multi-Split

U7 signals a transmission failure between multiple outdoor units (on systems with an outdoor storage/booster unit or linked…

UA — Split & Multi-Split

Defect of indoor/outdoor power supply.

UH — Split & Multi-Split

Malfunction of system.

UJ — Split & Multi-Split

Malfunction of transmission (accessory device).

A1 — SkyAir

Malfunction of indoor unit PCB.

A3 — SkyAir

A3 flags a fault in the indoor unit's drain level control system on a Daikin SkyAir unit — the float switch or drain pump circuit…

A4 — SkyAir

Malfunction of freezing protection.

A5 — SkyAir

A5 covers two related protection functions on the indoor unit — high-pressure control while in heating mode and freeze-up…

A6 — SkyAir

Malfunction of fan motor.

AH — SkyAir

AH is specific to SkyAir indoor units fitted with the optional electrostatic air cleaner/dust collector accessory — it signals…

C4 — SkyAir

Malfunction of liquid pipe thermistor for heat exchanger.

C9 — SkyAir

Malfunction of suction air thermistor.

CC — SkyAir

Malfunction of humidity sensor system.

CJ — SkyAir

Room temperature thermistor in remote controller abnormality.

E1 — SkyAir

Defective outdoor unit PCB.

E3 — SkyAir

Actuation of high pressure switch (HPS).

E5 — SkyAir

Inverter compressor motor or overheat.

E6 — SkyAir

E6 signals overcurrent or a locked rotor condition on a standard (non-inverter) compressor motor — the outdoor PCB has detected…

E7 — SkyAir

E7 covers a general malfunction of the outdoor unit fan motor system — the motor fails to run, stalls, or reports an abnormal…

F3 — SkyAir

Malfunction of discharge pipe temperature.

F6 — SkyAir

F6 indicates abnormally high refrigerant pressure or an overcharged system, distinguished from E3 (mechanical high-pressure…

H3 — SkyAir

H3 reports a malfunction of the high-pressure switch (HPS) itself — a wiring break, connector failure, or switch defect on the…

H9 — SkyAir

H9 reports a malfunction of the outdoor air thermistor, the sensor that measures ambient outdoor temperature to inform defrost…

HJ — SkyAir

Malfunction of thermal storage tank water level.

J2 — SkyAir

Malfunction of current sensor of compressor.

J3 — SkyAir

Malfunction of discharge pipe thermistor.

J6 — SkyAir

Malfunction of heat exchanger thermistor.

J8 — SkyAir

Malfunction of thermistor (Refrigerant circuit).

J9 — SkyAir

Malfunction of thermistor (Refrigerant circuit).

L3 — SkyAir

El.

L4 — SkyAir

Malfunction of inverter radiation fin temperature rise.

L5 — SkyAir

nverter instantaneous overcurrent (DC output).

L8 — SkyAir

Malfunction of overcurrent inverter compressor.

LC — SkyAir

Malfunction of transmission between control and inverter PCB.

M1 — SkyAir

Malfunction of central remote controller PCB.

M8 — SkyAir

Malfunction of transmission between optional controllers for centralized control.

MA — SkyAir

Improper combination of optional controllers for centralized control.

MC — SkyAir

Address duplication, improper setting.

P3 — SkyAir

P3 reports a malfunction of the thermistor located in the switch (electrical component) box — specifically the reactor thermistor…

P4 — SkyAir

Malfunction of radiation fin temperature sensor.

P9 — SkyAir

P9 is not a fault code but a status indication that the automatic refrigerant charge operation has completed successfully — it…

PA — SkyAir

Refrigerant cylinder during automatic refrigerant charging.

U0 — SkyAir

Shortage of refrigeran.

U1 — SkyAir

Reverse phase, open phase.

U2 — SkyAir

Malfunction of power supply or instantaneous power failure.

U3 — SkyAir

Check operation not executed or transmission error.

U4 — SkyAir

Malfunction of transmission between indoor and outdoor unit.

U5 — SkyAir

U5 reports a transmission failure specifically between the indoor unit and its wired remote controller, distinguishing it from…

UA — SkyAir

UA reports an improper combination of indoor and outdoor units — a mismatch condition detected at startup where the connected…

UJ — SkyAir

Malfunction of transmission (accessory device).

A0 — SkyAir

External protection device activated.

A7 — SkyAir

Malfunction of swing flap motor.

A8 — SkyAir

Malfunction of power supply or AC input overcurrent.

A9 — SkyAir

A9 indicates a malfunction of the indoor unit's electronic expansion valve (EEV), the component that meters refrigerant flow into…

AF — SkyAir

Malfunction of a humidifier system.

AJ — SkyAir

Malfunction of capacity setting (Indoor unit PCB).

C1 — SkyAir

Failure of transmission (between indoor unit PCB and sub PCB).

C6 — SkyAir

Malfunction of fan motor sensor or fan control driver.

E0 — SkyAir

E0 is a unified outdoor-unit protection code — it reports that some external safety device wired into the outdoor unit PCB's…

E4 — SkyAir

Actuation of low pressure switch (LPS).

E9 — SkyAir

Malfunction of electronic expansion valve coil.

H4 — SkyAir

Malfunction of low pressure switch (LPS).

H7 — SkyAir

Malfunction of outdoor unit fan motor signal.

HC — SkyAir

HC signals a malfunction of the (hot) water temperature thermistor, a sensor used on SkyAir outdoor units configured with…

J1 — SkyAir

Malfunction of pressure sensor.

J5 — SkyAir

Malfunction of suction pipe thermistor.

J7 — SkyAir

Malfunction of thermistor (Refrigerant circuit).

JA — SkyAir

Malfunction of high pressure sensor.

JC — SkyAir

JC reports a malfunction of the low-pressure sensor on the outdoor unit — an electronic transducer fault distinct from H4's…

L1 — SkyAir

Malfunction of inverter PCB.

L9 — SkyAir

Malfunction of inverter compressor startup error (Stall prevention).

P1 — SkyAir

P1 indicates a power supply phase imbalance or an inverter PCB fault on three-phase SkyAir outdoor units — the control detects an…

P2 — SkyAir

Automatic refrigerant charge operation stop.

P8 — SkyAir

Heat exchanger freezing protection during automatic refrigerant charging.

PE — SkyAir

Automatic refrigerant charge operation nearly completed.

PJ — SkyAir

Improper combination between inverter and fan driver.

U8 — SkyAir

Malfunction of transmission between remote controllers.

U9 — SkyAir

Malfunction of transmission (other system).

UC — SkyAir

Malfunction of setting of centralized control equipment address.

UE — SkyAir

Malfunction of transmission between indoor unit and centralized control equipment.

UF — SkyAir

System is not set yet.

A1 — VRV

On a Daikin VRV system, code A1 indicates the microprocessor on an individual indoor unit's PCB has detected an internal…

A3 — VRV

Drain Level Control System Abnormality.

A4 — VRV

Malfunction of freezing protection.

A5 — VRV

Code A5 is a protective shutdown local to one indoor unit, triggered when that unit's heat exchanger thermistor senses conditions…

A6 — VRV

Malfunction of fan motor.

AH — VRV

Malfunction of dust collector of air cleaner.

C4 — VRV

Malfunction of liquid pipe thermistor for heat exchanger.

C5 — VRV

Malfunction of gas pipe thermistor for heat exchanger.

C9 — VRV

Malfunction of suction air thermistor.

CA — VRV

Malfunction of discharge air thermistor.

CJ — VRV

Room temperature thermistor in remote controller abnormality.

E1 — VRV

Defective outdoor unit PCB.

E3 — VRV

Actuation of high pressure switch (HPS).

E5 — VRV

E5 indicates the inverter-driven compressor has either stalled/locked mechanically or its motor windings have overheated, and the…

E6 — VRV

STD compressor motor overcurrent/lock.

E7 — VRV

Malfunction of outdoor unit fan motor system.

F3 — VRV

Malfunction of discharge pipe temperature.

F6 — VRV

Abnormal high pressure or refrigerant overcharged.

H3 — VRV

Malfunction of high pressure switch (HPS).

H9 — VRV

Malfunction of outdoor air thermistor.

HJ — VRV

Malfunction of thermal storage tank water level.

J2 — VRV

Malfunction of current sensor of compressor.

J3 — VRV

Malfunction of discharge pipe thermistor.

J6 — VRV

Malfunction of heat exchanger thermistor.

J8 — VRV

J8 flags a thermistor fault in the VRV outdoor unit's subcooling (double-tube heat exchanger) circuit — the supplemental liquid…

J9 — VRV

Malfunction of thermistor (Refrigerant circuit).

L3 — VRV

El.

L4 — VRV

L4 trips when the inverter's heatsink (radiation fin) thermistor detects the fin temperature climbing beyond safe limits,…

L5 — VRV

L5 is triggered when the inverter detects a sudden overcurrent spike on its DC output feeding the compressor, almost always from…

L8 — VRV

Malfunction of overcurrent inverter compressor.

LC — VRV

Malfunction of transmission between control and inverter PCB.

M1 — VRV

M1 is a fault on the central (system-wide) remote controller's own PCB — the touchscreen or wall-mounted controller used to…

M8 — VRV

Malfunction of transmission between optional controllers for centralized control.

MA — VRV

Improper combination of optional controllers for centralized control.

MC — VRV

Address duplication, improper setting.

P3 — VRV

Malfunction of thermistor in switch box.

P4 — VRV

Malfunction of radiation fin temperature sensor.

P9 — VRV

P9 is not a fault — it's an informational status code confirming the automatic refrigerant charging procedure has finished…

PA — VRV

PA displays during the automatic refrigerant charging procedure when the refrigerant cylinder connected to the master (lead)…

PH — VRV

Refrigerant cylinder during automatic refrigerant charging.

U0 — VRV

U0 indicates the system has detected an operating refrigerant shortage during normal running (not during commissioning charging)…

U1 — VRV

Reverse phase, open phase.

U2 — VRV

Malfunction of power supply or instantaneous power failure.

U3 — VRV

Check operation not executed or transmission error.

U4 — VRV

Malfunction of transmission between indoor and outdoor unit.

U5 — VRV

Malfunction of transmission between indoor unit and remote controller.

U7 — VRV

Malfunction of transmission between outdoor units or outdoor storage unit.

UA — VRV

UA fires when the outdoor unit's PCB detects a system configuration that doesn't match its supported combination rules — most…

UH — VRV

Malfunction of system.

UJ — VRV

Malfunction of transmission (accessory device).

A0 — VRV

External protection device activated.

A7 — VRV

Malfunction of swing flap motor.

A8 — VRV

Malfunction of power supply or AC input overcurrent.

A9 — VRV

A9 flags a fault in the electronic expansion valve (EEV) circuit on an individual indoor unit — either the valve coil itself, its…

AF — VRV

Malfunction of a humidifier system.

AJ — VRV

AJ appears when an indoor unit's PCB cannot read or match a valid capacity (horsepower/model) setting, most commonly after a…

C1 — VRV

Failure of transmission (between indoor unit PCB and sub PCB).

C6 — VRV

Malfunction of fan motor sensor or fan control driver.

E0 — VRV

Protection devices activated (unified).

E4 — VRV

Actuation of low pressure switch (LPS).

E9 — VRV

Malfunction of electronic expansion valve coil.

H4 — VRV

Malfunction of low pressure switch (LPS).

H7 — VRV

Malfunction of outdoor unit fan motor signal.

HC — VRV

Malfunction of (hot) water temperature thermistor.

J1 — VRV

Malfunction of pressure sensor.

J5 — VRV

J5 signals a fault in the thermistor monitoring suction (compressor inlet) gas temperature on the outdoor unit, which the…

J7 — VRV

Malfunction of thermistor (Refrigerant circuit).

JA — VRV

Malfunction of high pressure sensor.

JC — VRV

Malfunction of low pressure sensor.

L1 — VRV

Malfunction of inverter PCB.

L9 — VRV

L9 fires when the inverter compressor cannot successfully ramp up to speed during startup — stall-prevention logic detects the…

P1 — VRV

P1 is triggered by the outdoor unit's main circuit detecting an unbalanced or out-of-range supply voltage across phases, or a…

P2 — VRV

Automatic refrigerant charge operation stop.

P8 — VRV

P8 is a protective stop that occurs only during the automatic refrigerant charging procedure (used at commissioning to precisely…

PE — VRV

Automatic refrigerant charge operation nearly completed.

PJ — VRV

Improper combination between inverter and fan driver.

U8 — VRV

Malfunction of transmission between remote controllers.

U9 — VRV

Malfunction of transmission (other system).

UC — VRV

Malfunction of setting of centralized control equipment address.

UE — VRV

Malfunction of transmission between indoor unit and centralized control equipment.

UF — VRV

System is not set yet.

EC — VRV

Malfunction of entering water temperature.

HF — VRV

Alarm in thermal storage unit or storage controller.

J4 — VRV

Malfunction of low pressure equivalent saturated temperature sensor system.

JE — VRV

Malfunction of oil pressure sensor or sub-tank thermistor.

JF — VRV

Malfunction of oil level sensor or heating heat exchanger thermistor.

L0 — VRV

Malfunction of inverter system.

L6 — VRV

Inverter instantaneous overcurrent (AC output).

LA — VRV

Malfunction of power transistor.

P0 — VRV

Shortage of refrigerant amount (thermal storage unit).

PC — VRV

Refrigerant cylinder during automatic refrigerant charging.

U6 — VRV

Malfunction of transmission between indoor units.

A1 — Packaged Unit

Malfunction of indoor unit PCB.

A4 — Packaged Unit

Malfunction of freezing protection.

A5 — Packaged Unit

High pressure control in heating, freeze-up protection control in cooling.

A6 — Packaged Unit

Malfunction of fan motor.

C4 — Packaged Unit

Malfunction of liquid pipe thermistor for heat exchanger.

C5 — Packaged Unit

Malfunction of gas pipe thermistor for heat exchanger.

C9 — Packaged Unit

Malfunction of suction air thermistor.

CA — Packaged Unit

Malfunction of discharge air thermistor.

CC — Packaged Unit

Malfunction of humidity sensor system.

CJ — Packaged Unit

Room temperature thermistor in remote controller abnormality.

E1 — Packaged Unit

Defective outdoor unit PCB.

E3 — Packaged Unit

Actuation of high pressure switch (HPS).

E5 — Packaged Unit

Inverter compressor motor or overheat.

E6 — Packaged Unit

STD compressor motor overcurrent/lock.

E7 — Packaged Unit

Malfunction of outdoor unit fan motor system.

F3 — Packaged Unit

Malfunction of discharge pipe temperature.

F6 — Packaged Unit

Abnormal high pressure or refrigerant overcharged.

H3 — Packaged Unit

Malfunction of high pressure switch (HPS).

H6 — Packaged Unit

Malfunction of position detection sensor.

H9 — Packaged Unit

H9 covers the outdoor air (ambient) thermistor used for defrost timing, outdoor-temperature-based capacity control, and…

HJ — Packaged Unit

Malfunction of thermal storage tank water level.

J2 — Packaged Unit

Malfunction of current sensor of compressor.

J3 — Packaged Unit

Malfunction of discharge pipe thermistor.

J6 — Packaged Unit

Malfunction of heat exchanger thermistor.

J8 — Packaged Unit

Malfunction of thermistor (Refrigerant circuit).

J9 — Packaged Unit

Malfunction of thermistor (Refrigerant circuit).

L4 — Packaged Unit

Malfunction of inverter radiation fin temperature rise.

L5 — Packaged Unit

nverter instantaneous overcurrent (DC output).

L8 — Packaged Unit

Malfunction of overcurrent inverter compressor.

LC — Packaged Unit

LC is an internal communication fault between the outdoor unit's main control PCB and its inverter PCB — the two boards have lost…

M1 — Packaged Unit

Malfunction of central remote controller PCB.

M8 — Packaged Unit

M8 flags a lost communication link between optional centralized-control accessories — devices like a schedule timer, unified…

MA — Packaged Unit

MA is a configuration fault detected at power-up or reset: the centralized-control network has an improper combination of…

MC — Packaged Unit

Address duplication, improper setting.

P3 — Packaged Unit

Malfunction of thermistor in switch box.

P4 — Packaged Unit

Malfunction of radiation fin temperature sensor.

P9 — Packaged Unit

Automatic refrigerant charge operation completed.

PA — Packaged Unit

Refrigerant cylinder during automatic refrigerant charging.

PH — Packaged Unit

PH indicates a fault in the refrigerant cylinder heater circuit used during automatic refrigerant charging — the heater (and its…

U0 — Packaged Unit

Shortage of refrigeran.

U1 — Packaged Unit

U1 is a power-supply phase fault detected at the outdoor unit's main PCB (A1P) — either the incoming three-phase power is missing…

U2 — Packaged Unit

Malfunction of power supply or instantaneous power failure.

U3 — Packaged Unit

Check operation not executed or transmission error.

U4 — Packaged Unit

Malfunction of transmission between indoor and outdoor unit.

U5 — Packaged Unit

Malfunction of transmission between indoor unit and remote controller.

U7 — Packaged Unit

Malfunction of transmission between outdoor units or outdoor storage unit.

UA — Packaged Unit

UA is a system-configuration mismatch detected at startup — too many indoor units connected to one outdoor unit, indoor and…

UH — Packaged Unit

Malfunction of system.

UJ — Packaged Unit

UJ flags a communication fault with an accessory device — such as a wired remote sensor, adapter PCB, or optional interface…

A0 — Packaged Unit

External protection device activated.

A9 — Packaged Unit

On a Daikin packaged unit, A9 indicates the indoor-side electronic expansion valve (EEV) circuit — the coil driver output or…

AJ — Packaged Unit

Malfunction of capacity setting (Indoor unit PCB).

E4 — Packaged Unit

Actuation of low pressure switch (LPS).

E9 — Packaged Unit

Malfunction of electronic expansion valve coil.

H7 — Packaged Unit

H7 flags a feedback-signal fault from the outdoor unit fan motor — the control PCB is not receiving the expected rotation/speed…

J1 — Packaged Unit

Malfunction of pressure sensor.

J5 — Packaged Unit

Malfunction of suction pipe thermistor.

J7 — Packaged Unit

Malfunction of thermistor (Refrigerant circuit).

JA — Packaged Unit

JA reports a fault on the high-pressure transducer — an analog sensor that feeds a continuous discharge-pressure reading to the…

JC — Packaged Unit

JC is the low-pressure-sensor counterpart to JA: it flags an out-of-range or implausible signal from the suction/low-side…

L1 — Packaged Unit

L1 is a general inverter PCB malfunction — the outdoor unit's inverter driver board has detected an internal fault (blown fuse,…

L9 — Packaged Unit

L9 is a stall-prevention fault specific to the compressor startup sequence: the inverter detects the compressor failing to spin…

P1 — Packaged Unit

Power voltage imbalance or inverter PCB.

P2 — Packaged Unit

P2 halts the automatic refrigerant charging routine — a factory/field service function that meters refrigerant into the system…

P8 — Packaged Unit

Heat exchanger freezing protection during automatic refrigerant charging.

PE — Packaged Unit

Automatic refrigerant charge operation nearly completed.

PJ — Packaged Unit

Improper combination between inverter and fan driver.

U8 — Packaged Unit

U8 is a communication fault specifically between a main wired remote controller and a sub (secondary) remote controller on the…

U9 — Packaged Unit

Malfunction of transmission (other system).

UC — Packaged Unit

Malfunction of setting of centralized control equipment address.

UE — Packaged Unit

Malfunction of transmission between indoor unit and centralized control equipment.

UF — Packaged Unit

System is not set yet.

PC — Packaged Unit

Refrigerant cylinder during automatic refrigerant charging.

U6 — Packaged Unit

Malfunction of transmission between indoor units.

AA — Packaged Unit

Heater overheat.

A3 — Fan Coil

Drain Level Control System Abnormality.

A4 — Fan Coil

Freeze (anti-frost) protection has tripped on the fan coil's water coil.

AH — Fan Coil

Fault on the fan coil's electrostatic dust-collecting air cleaner, an optional accessory fitted in the return-air path upstream…

C4 — Fan Coil

Malfunction of liquid pipe thermistor for heat exchanger.

C9 — Fan Coil

Malfunction of suction air thermistor.

CJ — Fan Coil

Room temperature thermistor in remote controller abnormality.

M1 — Fan Coil

Malfunction of central remote controller PCB.

M8 — Fan Coil

Malfunction of transmission between optional controllers for centralized control.

MA — Fan Coil

Improper combination of optional controllers for centralized control.

MC — Fan Coil

Address duplication, improper setting.

U1 — Fan Coil

Reverse phase, open phase.

U2 — Fan Coil

Malfunction of power supply or instantaneous power failure.

U3 — Fan Coil

Check operation not executed or transmission error.

U4 — Fan Coil

Malfunction of transmission between indoor and outdoor unit.

U5 — Fan Coil

Malfunction of transmission between indoor unit and remote controller.

U7 — Fan Coil

Malfunction of transmission between outdoor units or outdoor storage unit.

U8 — Fan Coil

Malfunction of transmission between remote controllers.

U9 — Fan Coil

Malfunction of transmission (other system).

UC — Fan Coil

Malfunction of setting of centralized control equipment address.

UE — Fan Coil

Malfunction of transmission between indoor unit and centralized control equipment.

U6 — Fan Coil

Malfunction of transmission between indoor units.

Code Index

All Codes

6A 7A 7C 8A 8E 8F 8H 60 64 65 70 71 72 73 74 75 76 77 78 80 81 82 83 84 85 86 88 89 90 91 92 94 95 96 97 98 99 A0 A1 A3 A4 A5 A6 A7 A8 A9 AA AF AH AJ C1 C4 C5 C6 C7 C9 CA CC CJ E0 E1 E3 E4 E5 E6 E7 E8 E9 EA EC F3 F6 H0 H1 H3 H4 H5 H6 H7 H8 H9 HC HF HJ J1 J2 J3 J4 J5 J6 J7 J8 J9 JA JC JE JF L0 L1 L3 L4 L5 L6 L8 L9 LA LC M1 M8 MA MC P0 P1 P2 P3 P4 P8 P9 PA PC PE PH PJ U0 U1 U2 U3 U4 U5 U6 U7 U8 U9 UA UC UE UF UH UJ

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