General Assist Technical Reference
VRF Error Codes & Display Indications
Indoor unit, outdoor unit, DX-Kit and remote-controller fault reference
Covers normal-operation displays, abnormal-operation flashing patterns and error-code lists shown in the supplied service-manual extracts.
How to use this article: First identify where the indication is being displayed — indoor unit LEDs, outdoor unit 7-segment display, DX-Kit, simple/wired remote controller, or group/central/touch-panel controller — then use the matching section below.
Important: Some indoor-unit indications depend on the outdoor-unit fault content and may not be displayed. Where the source lists a troubleshooting reference number, it is retained below for cross-reference to the applicable service manual.
1. Normal Operation Displays
1.1 Indoor unit display
| Indication | Lamp | Pattern / Behaviour |
|---|---|---|
| Operation | Operation LED | Continuous lighting |
| Anti Freeze | Operation LED | Continuous lighting (lowered light) |
| Timer | Timer LED | Continuous lighting (lowered light) |
| Filter | Filter LED | Continuous lighting |
| Power Failure | Operation LED + Timer LED | Both LEDs flash with approximately 1-second ON / 1-second OFF timing. |
| Test Operation | Operation LED + Timer LED | Operation and Timer LEDs flash together with approximately 1-second ON / 1-second OFF timing. |
| Defrosting / Oil Recovery | Operation LED | 6 seconds ON / 2 seconds OFF, repeating. |
| Opposite Operation Mode | Timer LED | 3 seconds ON / 1 second OFF, repeating. |
| Maintenance Mode | Operation LED + Timer LED + Filter LED | All three LEDs flash with approximately 1-second ON / 1-second OFF timing. |
1.2 Outdoor unit 7-segment display
| Indication Type | Display | Description |
|---|---|---|
| Idling (stop) | Blank | Outdoor unit stopped / idling. |
| Cooling Mode | CL | Cooling operation. |
| Heating Mode | Ht | Heating operation. |
| Oil Recovery Operation | or | Oil recovery operation. |
| Defrost Operation | dF | Defrost operation. |
| Discharge Temperature Protection stopped | P1 | Protection stop indication. |
| High Pressure Protection stopped | P2 | Protection stop indication. |
| Low Pressure Protection stopped | P3 | Protection stop indication. |
| Compressor Temperature Protection stopped | P4 | Protection stop indication. |
| Peak Cut Mode | PC | Peak cut operation. |
| Low Noise Mode | Ln | Low noise operation. |
| Snow Falling Protection Fan Mode | Sn | Snow protection fan operation. |
| Inverter Compressor Operation Indication | Display blinking | Approximately 1 second ON / 1 second OFF. |
| Constant Speed Compressor Operation Indication | Display blinking | Approximately 0.5 second ON / 0.5 second OFF. |
| Inverter + Constant Speed Compressor Operation | Display blinking | Approximately 0.24 second ON / 0.24 second OFF. |
2. Abnormal Operation — Indoor Unit Display
During abnormal operation, the Filter LED flashes continuously. The number of flashes on the Operation and Timer LEDs identifies the fault.
| Error Contents | Operation LED | Timer LED | Filter LED | Troubleshooting |
|---|---|---|---|---|
| Remote Controller Communication Error | 1 flash | 2 flashes | Continuous flash | 9, 10 |
| Network Communication Error | 1 flash | 4 flashes | Continuous flash | 12 |
| Indoor Unit Parallel Communication Error | 1 flash | 6 flashes | Continuous flash | 11 |
| Indoor Unit Power Frequency Abnormal | 3 flashes | 1 flash | Continuous flash | 2 |
| Indoor Unit Main PCB Error | 3 flashes | 2 flashes | Continuous flash | 1, 3 |
| Room Temperature Sensor Error | 4 flashes | 1 flash | Continuous flash | 4 |
| Indoor Unit Heat Exchanger Sensor Error | 4 flashes | 2 flashes | Continuous flash | 5, 6 |
| Indoor Unit Fan Motor Error | 5 flashes | 1 flash | Continuous flash | 8 |
| Water Drain Abnormal | 5 flashes | 3 flashes | Continuous flash | 7 |
| Outdoor Unit Error | 9 flashes | 15 flashes | Continuous flash | 13–62 |
2.1 Outdoor Air Unit connected to indoor unit
| Error Contents | Error Code | Operation LED | Timer LED | Filter LED | Troubleshooting |
|---|---|---|---|---|---|
| Outdoor unit power supply error for fan motor 1 | 39-1 | 3 flashes | 9 flashes | Continuous flash | 100 |
| Outdoor unit power supply error for fan motor 2 | 39-2 | 3 flashes | 9 flashes | Continuous flash | 100 |
| Indoor unit suction air temp. thermistor error | 4A-1 | 4 flashes | 10 flashes | Continuous flash | 101 |
| Indoor unit discharge air temp. thermistor error | 4A-2 | 4 flashes | 10 flashes | Continuous flash | 102 |
| Indoor unit fan motor 2 rotation error | 59-2 | 5 flashes | 9 flashes | Continuous flash | 103 |
| No power | — | — | — | — | 104 |
3. DX-Kit Error Codes
| Error Contents | Error Code | Troubleshooting |
|---|---|---|
| Remote controller communication error | 12 | 9, 10 |
| Network communication error | 14 | 12 |
| Peripheral unit communication error | 16 | 11 |
| Indoor unit address setting error | 26 | 90 |
| Connection unit number error in WRC system | 29 | 105 |
| Indoor unit power supply abnormal | 31 | 2 |
| Indoor unit main PCB error | 32 | 1, 3 |
| Indoor unit (Communication circuit) WRC error | 3A | 106 |
| Indoor unit heat exchanger temp. thermistor error | 42 | 5, 6 |
| Indoor unit air temp. thermistor error | 4A | 101, 102 |
| Indoor unit coil 1 (Expansion valve) error | 52 | 107 |
| Indoor unit coil 2 (Expansion valve) error | 52 | 108 |
| Indoor unit water drain abnormal | 53 | 7 |
| Outdoor unit miscellaneous error | 9U | 14–62 |
| DX-Kit Error | J6 | 109 |
3.1 DX-Kit conditions without an error code
| Condition | Troubleshooting |
|---|---|
| Peripheral device – No Power | 110 |
| Peripheral device – FAN does not operate | 111 |
| Peripheral device – No cooling / No heating | 112 |
| DX-Kit No Power | 113 |
4. Outdoor Unit Error Display & Error Codes
During an outdoor-unit fault, the source shows POWER MODE LED101 ON and ERROR LED102 blinking at approximately 0.1 second ON / 0.1 second OFF. The display alternates between Err. and the quantity of stored errors. Use the ENTER / SELECT controls to view individual error types and, for indoor-unit abnormal errors, the affected indoor-unit address.
| Error Code | Error Contents | Troubleshooting |
|---|---|---|
| ---- | Initial Setting Error | 13 |
| 1 3.1 | Communication Error Between Outdoor Unit | 14 |
| 1 4.1 | Outdoor Unit Network communication 1 Error | 15 |
| 1 4.2 | Outdoor Unit Network communication 2 Error | 16 |
| 1 4.5 | Indoor unit number shortage | 62-2 |
| 2 6.1 | Auto Address Setting Error | 61 |
| 2 8.4 | Signal Amplifier Auto Address Setting Error | 62 |
| 5 U.1 | Indoor Unit Error | 1–12 |
| 6 1.5 | Outdoor Unit Reverse Phase, Missing Phase Wire Error | 17 |
| 6 2.3 | Outdoor Unit EEPROM Access Error | 18 |
| 6 2.6 | Inverter Communication Error | 19 |
| 6 2.8 | Outdoor Unit EEPROM Data Error | 20 |
| 6 3.1 | Inverter Error | 21 |
| 6 7.2 | Inverter PCB Momentary Power Failure Detection | 22 |
| 6 8.1 | Magnetic Relay Error | 23 |
| 6 8.2 | Rush Current Limiting Resistor Temp. Protection | 24 |
| 6 9.1 | Outdoor Unit Communication PCB Parallel Communication Error | 25 |
| 7 1.1 | Discharge Temp Sensor 1 Error | 26 |
| 7 1.2 | Discharge Temp Sensor 2 Error | 27 |
| 7 2.1 | Compressor Temp Sensor 1 Error | 28 |
| 7 2.2 | Compressor Temp Sensor 2 Error | 29 |
| 7 3.3 | Outdoor Unit Heat Ex. Liquid Temp. Sensor Error | 30 |
| 7 4.1 | Outdoor Temp Sensor Error | 31 |
| 7 5.1 | Suction Gas Temp Sensor Error | 32 |
| 7 7.1 | Heat Sink Temp Sensor Error | 33 |
| 8 2.1 | Sub-cool Heat Ex. Gas Inlet Temp. Sensor Error | 34 |
| 8 2.2 | Sub-cool Heat Ex. Gas Outlet Temp. Sensor Error | 35 |
| 8 3.1 | Liquid Pipe Temp. Sensor 1 Error | 36 |
| 8 3.2 | Liquid Pipe Temp. Sensor 2 Error | 37 |
| 8 4.1 | Current Sensor 1 Error | 38 |
| 8 6.1 | Discharge Pressure Sensor Error | 39 |
| 8 6.3 | Suction Pressure Sensor Error | 40 |
| 8 6.4 | High Pressure Switch 1 Error | 41 |
| 8 6.5 | High Pressure Switch 2 Error | 42 |
| 9 2.1 | Compressor 2 Error | 43 |
| 9 2.2 | Compressor 2 Current Value Error | 44 |
| 9 3.1 | Inverter Compressor Start Up Error | 45 |
| 9 4.1 | Trip Detection | 46 |
| 9 5.5 | Compressor Motor Loss of Synchronization | 47 |
| 9 7.1 | Outdoor Unit Fan Motor Lock Error | 48 |
| 9 7.4 | Outdoor Unit Fan Motor Undervoltage | 49 |
| 9 7.5 | Outdoor Unit Fan Motor Temperature Abnormal | 50 |
| 9 U.2 | Slave Unit Error | 51 |
| A 1.1 | Discharge Temperature 1 Abnormal | 52 |
| A 2.1 | Discharge Temperature 2 Abnormal | 53 |
| A 3.1 | Compressor 1 Temperature Abnormal | 54 |
| A 3.2 | Compressor 2 Temperature Abnormal | 55 |
| A 4.1 | High Pressure Abnormal | 56 |
| A 4.2 | High Pressure Protection 1 | 57 |
| A 4.3 | High Pressure Protection 2 | 58 |
| A 5.1 | Low Pressure Abnormal | 59 |
| A C.4 | Heat Sink Temperature Abnormal | 60 |
5. Remote Controller Error Displays
Simple remote controller: When an error occurs, the error code is shown with the faulty unit number / remote-controller address.
Wired remote controller: The display shows the unit number (usually 0) and error code.
Group remote controller: The timer and clock display shows the error code together with the model code. The source identifies model codes as outdoor unit, indoor unit, group remote controller and converter.
Wired remote controller: The display shows the unit number (usually 0) and error code.
Group remote controller: The timer and clock display shows the error code together with the model code. The source identifies model codes as outdoor unit, indoor unit, group remote controller and converter.
5.1 Simple and wired remote controller error-code list
| Error Code | Error Contents | Troubleshooting |
|---|---|---|
| 1 2 | Remote Controller Communication Error | 9, 10, 97 |
| 1 4 | Network Communication Error | 12 |
| 1 5 | Scan Error | 98 |
| 1 6 | Indoor Unit Parallel Communication Error | 11 |
| 3 1 | Indoor Unit Power Frequency Abnormal | 2 |
| 3 2 | Indoor Unit Main PCB Error | 1, 3 |
| 4 1 | Room Temperature Sensor Error | 4 |
| 4 2 | Indoor Unit Heat Ex. Sensor Error | 5, 6 |
| 5 1 | Indoor Unit Fan Motor Error | 8 |
| 5 3 | Water Drain Abnormal | 7 |
| 9 U | Outdoor Unit Error | 14–62 |
5.2 Group / Central / Touch-Panel Controller error-code list
| Error Code | Error Contents | Troubleshooting |
|---|---|---|
| -- | Initial Setting Error | 13 |
| 1 2 | Remote Controller Communication Error | 7, 9, 10, 85, 92 |
| 1 3 | Communication Error Between Outdoor Unit | 14 |
| 1 4 | Network Communication Error | 12, 15, 16, 95 |
| 1 5 | Scan Error | 92 |
| 1 6 | Indoor Unit Parallel Communication Error | 11, 96 |
| 2 6 | Address Setting Error | 90 |
| 2 8 | Other Setting Error | 61, 62, 91 |
| 3 1 | Indoor Unit Power Frequency Abnormal | 2 |
| 3 2 | Indoor Unit Main PCB Error | 1, 3 |
| 4 1 | Room Temperature Sensor Error | 4 |
| 4 2 | Indoor Unit Heat Ex. Sensor Error | 5, 6 |
| 5 1 | Indoor Unit Fan Motor Error | 8 |
| 5 3 | Water Drain Abnormal | 7 |
| 6 1 | Outdoor Unit Reverse Phase, Missing Phase Wire Error | 17 |
| 6 2 | Outdoor Unit Main PCB Error | 18–20 |
| 6 3 | Inverter Error | 21 |
| 6 7 | Inverter PCB Momentary Power Failure Detection | 22 |
| 6 8 | Magnetic Relay Error | 23, 24 |
| 6 9 | Outdoor Unit Communication PCB Error | 25 |
| 7 1 | Discharge Temperature Sensor Error | 26, 27 |
| 7 2 | Compressor Temperature Sensor Error | 28, 29 |
| 7 3 | Outdoor Unit Heat Ex. Temperature Sensor Error | 30 |
| 7 4 | Outdoor Temperature Sensor Error | 31 |
| 7 5 | Suction Gas Temperature Sensor Error | 32 |
| 7 7 | Heat Sink Temperature Sensor Error | 33 |
| 8 2 | Sub-cool Heat Ex. Gas Temperature Sensor Error | 34, 35 |
| 8 3 | Liquid Pipe Temperature Sensor Error | 36, 37 |
| 8 4 | Current Sensor Error | 38 |
| 8 6 | Pressure Sensor Error | 39–42 |
| 9 2 | Compressor 2 Error | 43, 44 |
| 9 3 | Compressor Start Up Error | 45 |
| 9 4 | Trip Detection | 46 |
| 9 5 | Compressor Motor Control Error | 47 |
| 9 7 | Outdoor Unit Fan Motor Error | 48–50 |
| A 1 | Discharge Temperature 1 Abnormal | 52 |
| A 2 | Discharge Temperature 2 Abnormal | 53 |
| A 3 | Compressor Temperature Abnormal | 54, 55 |
| A 4 | High Pressure Abnormal | 56–58 |
| A 5 | Low Pressure Abnormal | 59 |
| A C | Heat Sink Temperature Abnormal | 60 |
| C 4 | PCB Error | 61 |
| C A | Software Error | 82, 89 |
| C 1 | PCB Error 1 | 80, 85 |
Field tip: Record the exact display location, full error code or LED flash counts, and the affected unit address before resetting power. This helps ensure the correct troubleshooting section is used.
Technical reference prepared from the supplied VRF service-manual error-code pages.