Your acson aircon light blinking and you are searching for the error codes? AC light blinking usually indicate you have to service your aircon or the ac circuit board have problem that requires immediately attention.
Acson rooftop packaged air conditioner ( Multi Compressors ) error codes
How to check error codes?
When the system is on and an error occurs, the ON/OFF LED on the LCD panel will blink and an error code is shown. When the system is off and there is a thermistor error, the ON/OFF LED is off but the error code is still displayed. Each error code represents different message as below.
| Error code | Possible cause |
|---|---|
| E01 | Require manual reset |
| E02 | Compressor 1 high temperature |
| E03 | Compressor 2 high temperature |
| E04 | Compressor 3 high temperature |
| E05 | Compressor 4 high temperature |
| E06 | Compressor 1 high pressure trip / contact open |
| E07 | Compressor 2 high pressure trip / contact open |
| E08 | Compressor 3 high pressure trip / contact open |
| E09 | Compressor 4 high pressure trip / contact open |
| E10 | Compressor 1 trip / low refrigerant / outdoor abnormal |
| E11 | Compressor 2 trip / low refrigerant / outdoor abnormal |
| E12 | Compressor 3 trip / low refrigerant / outdoor abnormal |
| E13 | Compressor 4 trip / low refrigerant / outdoor abnorma |
| E14 | Room sensor short |
| E15 | Room sensor open |
| E16 | Indoor coil sensor 1 short |
| E17 | Indoor coil sensor 2 short |
| E18 | Indoor coil sensor 3 short |
| E19 | Indoor coil sensor 4 short |
| E20 | Indoor coil sensor 1 open |
| E21 | Indoor coil sensor 2 open |
| E22 | Indoor coil sensor 3 open |
| E23 | Indoor coil sensor 4 open |
| E24 | Outdoor coil sensor 1 short |
| E25 | Outdoor coil sensor 2 short |
| E26 | Outdoor coil sensor 3 short |
| E27 | Outdoor coil sensor 4 short |
| E28 | Outdoor coil sensor 1 open |
| E29 | Outdoor coil sensor 2 open |
| E30 | Outdoor coil sensor 3 open |
| E31 | Outdoor coil sensor 4 open |
| E32 | Compressor 1 de-ice |
| E33 | Compressor 2 de-ice |
| E34 | Compressor 3 de-ice |
| E35 | Compressor 4 de-ice |
Acson inverter-y indoor series air conditioner error codes
How to diagnosis error code using wireless handset G18?
- Hold down TIMER CANCEL button for 5 seconds, a “00 ” indication flashes on the
temperature display section. - Press TIMER CANCEL repeatedly until indoor buzzer produces a long beep. This indicates the error code, refers to Error Codes table and is displayed on the temperature display section.
- A short beep or two consecutive beeps indicate non-corresponding error codes.
- To cancel the error code display, hold down TIMER CANCEL button for 5 seconds.
Alternatively, the code display will cancel itself if the button is not pressed for 1 minute
| Error code | Possible cause |
|---|---|
| 0 | Normal |
| U0 | Insufficient gas |
| U2 | DC voltage out of range |
| U4 | Communication error |
| U7 | Signal transmission error (on outdoor unit PCB) |
| UA | Installation error |
| UF | Communication Error (indoor and outdoor) piping and wiring |
| UH | Anti-freeze function in other room |
| A1 | Indoor PCB error |
| A3 | Water pump error |
| A5 | Antifreeze |
| A6 | Indoor fan motor abnormal |
| C4 | Indoor heat exchanger thermistor short/ open |
| C9 | Indoor room thermistor short/ open |
| E1 | Outdoor PCB error |
| E3 | High pressure protection |
| E4 | Low pressure protection |
| E5 | Compressor motor lock |
| E6 | Compressor start-up error |
| E7 | Outdoor DC fan motor lock |
| E8 | Ac input over current |
| E9 | EXV error |
| EA | 4-way valve error |
| F3 | Discharge pipe overheat |
| F6 | Heat exchanger overheat |
| H0 | Compressor sensor system abnormality |
| H3 | High pressure switch error |
| H6 | Position sensor abnormality |
| H8 | AC current sensor error |
| H9 | Outdoor air thermistor short / open |
| J1 | Pressure sensor error |
| J3 | Compressor discharge pipe thermistor short /open / misplaced |
| J5 | Suction pipe thermistor short/ open |
| J6 | Outdoor heat exchanger |
| J7 | Subcooling heat exchanger thermistor short/ open |
| J8 | Liquid pipe thermistor short/ open |
| J9 | Gas pipe thermistor abnormality |
| LC | Communication error (control PCB and inverter PCB) |
| L1 | Outdoor PCB error |
| L3 | Electrical box temperature rise |
| L4 | Heat sink overheat |
| L5 | IPM error / IGBT error |
| L8 | Electrical thermal switch |
| L9 | Stall prevention |
| P1 | Open phase or voltage unbalance |
| P4 | Heat sink thermistor short / open |
| PJ | Capacity setting error |
Acson wall mounted K-Series inverter air conditioner error codes
The operation lamp flashes when any of the following errors is detected.
- When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions, disabling equipment operation.
- When a signal transmission error occurs between the indoor and outdoor units.
How to diagnosis error code using wireless handset APJ2?
- When the CANCELL button is held down for 5 seconds, a indication blinks on the temperature display section.
- Press the CANCELL button repeatedly until a continuously beep is produced.
| Error code | Possible cause |
|---|---|
| 00 | Normal |
| UA | Indoor-outdoor unit combination fault |
| U0 | Refrigerant shortage |
| U2 | Drop voltage or main circuit overvoltage |
| U4 | Failure of transmission ( between indoor unit and outdoor unit) |
| A1 | Indoor PCB defectiveness |
| A5 | High pressure control or freeze-up protector |
| A6 | Fan motor fault |
| C4 | Faulty heat exchanger temperature sensor |
| C9 | Faulty suction air temperature sensor |
| EA | Cooling-heating switching error |
| E1 | Circuit board fault |
| E5 | Ol started |
| E6 | Faulty compressor start up |
| E7 | DC fan motor fault |
| E8 | Overcurrent input |
| F3 | High temperature discharge PPE control |
| F6 | High pressure control ( in cooling ) |
| H0 | Sensor fault |
| H6 | Operation fault due to faulty position detection sensor |
| H8 | DC current sensor fault |
| H9 | Faulty suction air temperature sensor |
| J3 | Faulty discharge pipe temperature sensor |
| J6 | Faulty heat exchanger temperature sensor |
| L3 | Electrical parts heat fault |
| L4 | High temperature at inverter circuit heatsink |
| L5 | Output overcurrent |
| P4 | Faulty inverter circuit heatsink temperature sensor |
Note:
- A short beep and 2 consecutive beeps indicate non-corresponding codes.
- To cancel the code display, hold the CANCELL button down for 5 seconds. The code display also cancels itself if the button is not pressed for 1 minute.
Acson air conditioner general troubleshooting guide
When any air conditioner malfunction is noted, immediately switch off the power supply to the unit and
contact the local dealer if necessary.
| Problem Symptom | Check Item | Suggested Action |
|---|---|---|
| The unit does not work | Check the power supply | Check to make sure that the rated voltage is supplied |
| Check the fuse | Check and replace the fuse | |
| Check the remote controller timer setting | Make sure the delay timer is set correctly | |
| Fan does not work | Check the power supply | Check to make sure that the rated voltage is supplied |
| Check the fan motor capacitor | Check and replace the capacitor | |
| Check the fan motor | Check and replace the fan motor | |
| Check the switch | Check and change the switch | |
| Fan work, but compressor does not work | Check if the thermostat setting too high | Reset thermostat |
| Check the compressor capacitor | Check and replace the capacitor | |
| Check the compressor | Check and replace the compressor | |
| Check the compressor contactor | Check and replace the contactor | |
| Air conditioner work but cooling not satisfactory | Check if the thermostat setting too high | Reset thermostat |
| Check if the condenser coil dirty | Clean the condenser coil | |
| Check the condenser installation condition | Make sure the condenser is installed according to factory’s recommendation | |
| Diagnosis by service port pressure and operating Current | Check for insufficient refrigerant | |
| The air flow is too low | Check the air filter | Check and make sure the air filter is clean |
| Check the fan / blower condition | Check and make sure that the fan / blower are in good condition | |
| The remote controller Check and replace the battery. light is dim | Check the battery | Check and replace the battery |
Acson aircon diagnostic flows chart
Generally, there are two kinds of problems, i.e. starting failure and insufficient cooling/ heating. “Starting failure” is caused by electrical defect while improper application or defects in refrigerant circuit causes “insufficient cooling/ heating”.
Diagnosis of Electric circuit
The most common causes of air conditioner failure to ‘start’ are:
- Voltage not within ± 10% of the rated voltage.
- Power supply interrupted
- Improper control settings
- Air conditioner is disconnected from main power source
- Fuse blown or circuit breaker off.
Diagnosis of Refrigerant Circuit/ Application
There might be some causes where the unit starts to run but does not perform satisfactorily, example, insufficient cooling. Judgement could be made by measuring temperature difference of indoor unit’s intake and discharge air as well as running current.
