Daikin outdoor units come with a helpful feature – fault and error codes! When something goes wrong with your Daikin air conditioner, these codes provide valuable clues. They’re like the air conditioner’s way of saying, “Hey, I need some attention!” Let’s explore them and keep your system running smoothly.
Daikin Error Codes – Outdoor Unit
For error codes beginning with E, F, H, J, L, M or P, see table below.
For error codes beginning with 6, 7, 8 or 9, find causes here
For error codes beginning with A or C, find causes here
For error codes beginning with U, find causes here
| Outdoor Unit Error Codes and Contents | Supposed causes | Parts affected |
|---|---|---|
| E0 Protection devices activated (unified) |
Protection device connected to outdoor unit PCB actuated Defective protection device connector contact |
SkyAir, VRV, Chiller |
| E1 Defective outdoor unit PCB |
Defective outdoor unit PCB Defective connection of inside/ outside relay wires |
RA, SkyAir, VRV, Package, Chiller |
| E3 Actuation of high pressure switch (HPS) |
Dirty outdoor unit heat exchanger Defective high pressure switch Clogged refrigerant piping Defective connector contact |
RA, SkyAir, VRV, Package |
| E4 Actuation of low pressure switch (LPS) |
Abnormally drop in low pressure Defective low pressure sensor Defective outdoor unit PCB Defective connector contact |
SkyAir, VRV, Package, Chiller |
| E5 Inverter compressor motor or overheat |
Inverter compressor lock High differential pressure Defective inverter PCB UVW connection error Defective connector contact |
RA, SkyAir, VRV, Package, Chiller |
| E6 STD compressor motor overcurrent/lock |
Defective compressor Defective control PCB The stop valve is not opened |
RA, SkyAir, VRV, Package |
| E7 Malfunction of outdoor unit fan motor system |
Fan motor failure Neglect to connect or defective connection of harness/ connector between the fan motor and the PCB Fan does not rotate due to foreign matters caught in it |
RA, SkyAir, VRV, Package, Chiller |
| E8 Overcurrent of inverter compressor |
Defective compressor Defective inverter main circuit capacitor Defect of outdoor unit PCB Defect of power transistor |
RA, Chiller |
| E9 Malfunction of electronic expansion valve coil |
Disconnection of connectors from electronic expansion valves Defective electronic expansion valve coil Defective outdoor unit control PCB |
SkyAir, VRV, Package, Chiller |
| EA Malfunction of four way valve or cool/heat switch |
Defective four way valve Shortage of gas Defective outdoor unit PCB Defective thermistor |
RA |
| EC Malfunction of entering water temperature |
Cooling water temperature abnormality Defective outdoor unit PCB Defective thermistor |
VRV |
| F3 Malfunction of discharge pipe temperature |
Defective discharge pipe thermistor Abnormal discharge pipe temperature Defective outdoor unit control PCB Defective connector contact |
RA, SkyAir, VRV, Package, Chiller |
| F6 Abnormal high pressure or refrigerant overcharged |
Refrigerant overcharged Disconnection of heat exchanger deicer thermistor Disconnection of outdoor air thermistor Disconnection of liquid pipe temperature thermistor Defective outdoor unit PCB |
RA, SkyAir, VRV, Package |
| H0 Malfunction of sensor system of compressor |
Harness is disconnected, or defective connection Defective PCB |
RA, Chiller |
| H1 Malfunction of room temperature sensor or humidifier unit damper |
Defective limit switch Defective damper |
RA, Chiller |
| H3 Malfunction of high pressure switch (HPS) |
Defective high pressure switch Broken wire Defective outdoor unit PCB Defective connector contact |
RA, SkyAir, VRV, Package, Chiller |
| H4 Malfunction of low pressure switch (LPS) |
Defective low pressure switch Broken wire Defective outdoor unit PCB Defective connector contact |
SkyAir, VRV, Chiller |
| H5 Malfunction of compressor motor overload thermistor |
Defect of compressor motor overload thermistor Defective connector contact |
RA, Chiller |
| H6 Malfunction of position detection sensor |
Faulty contact of compress or cable Defective compressor Defective outdoor unit PCB |
RA, Package, Chiller |
| H7 Malfunction of outdoor unit fan motor signal |
Abnormal signal from fan motor (Circuit failure) Disconnection/Short circuit in fan motor leads or disconnection of connector Defective inverter PCB |
SkyAir, VRV, Package, Chiller |
| H8 Malfunction of compressor input (CT) system |
Defective power transistor Defective reactor Faulty wiring of inverter system Defective outdoor unit PCB |
RA, Chiller |
| H9 Malfunction of outdoor air thermistor |
Defective connection of thermistor Defective outdoor unit PCB Defective outdoor air thermistor |
RA, SkyAir, VRV, Package, Chiller |
| HC Malfunction of (hot) water temperature thermistor |
Defective connection of thermistor Defective outdoor unit PCB Defective water temperature thermistor |
SkyAir, VRV, Chiller |
| HF Alarm in thermal storage unit or storage controller |
Thermal storage group defective wiring Defective setting Excess of thermal storage tank numbers |
VRV |
| HJ Malfunction of thermal storage tank water level |
Low water level Defective switch setting Water level detecting sensor failure Defective connector contact |
RA, SkyAir, VRV, Package |
| J1 Malfunction of pressure sensor |
Defective pressure sensor connector contact Defective pressure sensor Defective outdoor unit PCB |
SkyAir, VRV, Package, Chiller |
| J2 Malfunction of current sensor of compressor |
Defective current sensor Defective compressor Defective outdoor unit PCB |
RA, SkyAir, VRV, Package, Chiller |
| J3 Malfunction of discharge pipe thermistor |
Defective connection of thermistor Defective discharge pipe thermistor Defective outdoor unit PCB |
RA, SkyAir, VRV, Package, Chiller |
| J4 Malfunction of low pressure equivalent saturated temperature sensor system |
Defective connection of thermistor Defective thermistor Defective outdoor unit PCB |
VRV, Chiller |
| J5 Malfunction of suction pipe thermistor |
Defective connection of thermistor Defective suction pipe thermistor Defective outdoor unit PCB |
SkyAir, VRV, Package, Chiller |
| J6 Malfunction of heat exchanger thermistor |
Defective connection of thermistor Defective heat exchanger thermistor Defective outdoor unit PCB |
RA, SkyAir, VRV, Package, Chiller |
| J7 Malfunction of thermistor (Refrigerant circuit) |
Defective connection of thermistor Defective liquid pipe thermistor Defective outdoor unit PCB |
SkyAir, VRV, Package, Chiller |
| J8 Malfunction of thermistor (Refrigerant circuit) |
Defective connection of thermistor Defective liquid pipe thermistor Defective outdoor unit PCB |
RA, SkyAir, VRV, Package, Chiller |
| J9 Malfunction of thermistor (Refrigerant circuit) |
Defective connection of thermistor Defective gas pipe thermistor Defective outdoor unit PCB |
RA, SkyAir, VRV, Package, Chiller |
| Outdoor Unit Error Codes and Contents | Supposed causes | Parts affected |
|---|---|---|
| JA Malfunction of high pressure sensor |
Defective connector contact Connection of low pressure sensor in mistake for high pressure sensor Defective high pressure sensor Defective outdoor unit PCB |
SkyAir, VRV, Package, Chiller |
| JC Malfunction of low pressure sensor |
Defective connector contact Connection of high pressure sensor in mistake for low pressure sensor Defective low pressure sensor Defective outdoor unit PCB |
SkyAir, VRV, Package, Chiller |
| JE Malfunction of oil pressure sensor or sub-tank thermistor |
Defective connector contact Defective sub-tank thermistor Defective outdoor unit PCB |
VRV |
| JF Malfunction of oil level sensor or heating heat exchanger thermistor |
Defective connector contact Defective heat exchanger thermistor Defective outdoor unit PCB |
VRV |
| L0 Malfunction of inverter system |
Shortage of power supply capacity Defective power transistor Defective outdoor unit PCB |
VRV, Chiller |
| L1 Malfunction of inverter PCB |
Defective compressor wiring Defective outdoor unit fan motor Blown fuse Defective inverter PCB |
SkyAir, VRV, Package, Chiller |
| L3 El.compo. box temperature rise |
Fin temperature rise due to short circuit Defective outdoor unit fan motor Defective power transistor Defective outdoor unit PCB |
RA, SkyAir, VRV, Chiller |
| L4 Malfunction of inverter radiation fi n temperature rise |
Fin temperature rise due to short circuit Defective fi n thermistor |
RA, SkyAir, VRV, Package, Chiller |
| L5 Inverter instantaneous overcurrent (DC output) |
Defective compressor coil (such as wiring disconnection or insulation failure) Compressor startup failure (mechanical lock) Defective inverter PCB |
RA, SkyAir, VRV, Package, Chiller |
| L6 Inverter instantaneous overcurrent (AC output) |
Overcharge of refrigerant amount Shortage of power supply capacity Defective compressor Defective inverter unit |
VRV, Chiller |
| L8 Malfunction of overcurrent inverter compressor |
Compressor overloaded Wiring disconnection in compressor coil Disconnection of compressor wiring Defective inverter PCB |
RA, SkyAir, VRV, Package, Chiller |
| L9 Malfunction of inverter compressor startup error (Stall prevention) |
The stop valve is not opened Defective compressor Error in wire connections to compressor Large differential pressure before compressor startup Defective inverter PCB |
SkyAir, VRV, Package, Chiller |
| LA Malfunction of power transistor |
Defective power transistor Defective compressor Defective inverter PCB |
VRV, Chiller |
| LC Malfunction of transmission between control and inverter PCB |
Defective connection between the inverter PCB and the control PCB External factors (e.g. noise) Defective inverter compressor Defective control PCB (transmission block) |
RA, SkyAir, VRV, Package, Chiller |
| M1 Malfunction of central remote controller PCB |
Defective central remote controller PCB | RA, SkyAir, VRV, Package, Fan Coil |
| M8 Malfunction of transmission between optional controllers for centralized control |
Other centralized control power disconnection Centralized control reset switch ON Defective transmission wiring Central remote controller address change |
RA, SkyAir, VRV, Package, Fan Coil |
| 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 |
RA, SkyAir, VRV, Package, Fan Coil |
| MC Address duplication, improper setting |
Address duplication of central remote controller | RA, SkyAir, VRV, Package, Fan Coil |
| PO Shortage of refrigerant amount (thermal storage unit) |
Shortage of refrigerant Clogged refrigerant piping |
VRV, Chiller |
| P1 Power voltage imbalance or inverter PCB |
Open phase Interphase voltage imbalance Defective capacitor in the main circuit Defective wiring in the main circuit Defective inverter PCB |
SkyAir, VRV, Package, Chiller |
| P2 Automatic refrigerant charge operation stop |
The stop valve is not opened Closed valve of refrigerant tank |
SkyAir, VRV, Package, Chiller |
| P3 Malfunction of thermistor in switch box |
Defective connection of thermistor Defective reactor thermistor Defective inverter PCB |
RA, SkyAir, VRV, Package, Chiller |
| P4 Malfunction of radiation fin temperature sensor |
Defective radiation fi n temperature thermistor Defective inverter PCB Defective INV. compressor Defective fan motor |
RA, SkyAir, VRV, Package, Chiller |
| P8 Heat exchanger freezing protection during automatic refrigerant charging |
(Close the refrigerant cylinder. Start again from step 1.) | SkyAir, VRV, Package |
| P9 Malfunction of fan motor (humidifier unit) |
__ | SkyAir, VRV, Package, Heat reclaim ventilator |
| PA Refrigerant cylinder during automatic refrigerant charging |
Refrigerant cylinder of master unit is empty | SkyAir, VRV, Package |
| PA Broken wire of heater (humidifier unit) |
Defective heater unit Defective thermistor Defective outdoor unit PCB |
RA |
| PC Refrigerant cylinder during automatic refrigerant charging |
Refrigerant cylinder of slave unit 2 is empty | VRV, Package |
| PE Automatic refrigerant charge operation nearly completed |
__ | SkyAir, VRV, Package |
| PH Refrigerant cylinder during automatic refrigerant charging |
Defective heater unit Defective connector contact Defective thermistor Defective outdoor unit PCB |
RA, VRV, Package |
| PJ Malfunction of capacity setting (Outdoor unit PCB) |
Capacity setting adaptor is not installed Improper capacity setting adaptor Defective outdoor unit PCB |
SkyAir |
| PJ Improper combination between inverter and fan driver |
Mis-matching of type of PCB Improper (or no) fi eld setting after replacing outdoor unit main PCB |
SkyAir, VRV, Package, Chiller |
