Ariston Air Conditioners Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
The indoor unit will not start; the display shows E01 shortly after power-on.
Indoor-Outdoor Communication Failure
E02
The indoor unit stops shortly after starting; the display shows E02 and the compressor does not run.
High-Pressure Protection / Overpressure Trip
E03
The indoor unit stops cooling and displays E03; sometimes accompanied by ice on the indoor coil.
Low-Pressure / Refrigerant Undercharge Protection
E04
The unit stops and displays E04; this sometimes occurs during very hot operation or after a long runtime.
Compressor Overload / Overheat Protection
E05
Indoor unit runs briefly then stops; the display shows E05, and the unit may blow only fan air.
Indoor Room Temperature Sensor (NTC) Fault
E06
The unit stops and displays E06; cooling or heating does not start properly.
Indoor Evaporator Coil Temperature Sensor Fault
E07
The outdoor unit does not start; the indoor unit shows E07, and only the fan may run.
Outdoor Condenser Coil Temperature Sensor Fault
E08
The unit attempts to start but stops with E08; the compressor does not run.
Compressor Overcurrent / Inverter Module Protection
E09
The indoor unit shows E09; the unit may run only in limited mode or stop frequently.
EEPROM / Memory Error on Indoor PCB
E10
The unit displays E10 and stops; this often occurs during heating mode on heat pump models.
Defrost Sensor / Defrost Protection Error
E11
The indoor unit shows E11; the louver may not move, and airflow direction cannot be adjusted.
Indoor Louver Motor / Stepper Motor Fault
E12
The unit displays E12; the indoor fan may not start or runs erratically.
Indoor Fan Motor Fault
E13
The unit shows E13; the outdoor fan does not run or runs intermittently.
Outdoor Fan Motor Fault
E14
The indoor unit shows E14; the unit may not respond to the remote or operates erratically.
Indoor PCB Communication / Keypad Interface Error
E15
Unit displays E15; compressor does not start, and the outdoor unit remains off.
Outdoor-Indoor Communication Error
E16
Unit displays E16; the compressor starts then quickly stops, or does not start at all.
Phase / Power Supply Protection (for certain models)
E17
Unit displays E17; sometimes associated with poor cooling and frequent stops.
Discharge Pipe Temperature Sensor Fault
E18
Unit displays E18; it may shut down unexpectedly during operation.
Condensate Pump / Drain Pump Fault (for cassette or ducted models)
E19
Unit displays E19; the remote control does not seem to communicate properly.
Indoor IR Receiver / Remote Communication Fault
E20
Unit displays E20; Wi-Fi or smart control functions do not operate correctly (on connected models).
Wi-Fi Module / Smart Interface Error
Symptom
Air conditioner does not start at all; no lights on the indoor unit.
No Power / Dead Indoor Unit
Symptom
Air conditioner runs but does not cool the room effectively; air from the indoor unit is only slightly cool.
Insufficient Cooling Capacity / Performance Loss
Symptom
Burning or electrical smell from indoor or outdoor unit.
Overheating Electrical Component
Symptom
Indoor unit display is blank or segments are missing, but the unit still operates.
Display Panel / LED Segment Failure
Symptom
Indoor unit emits a musty or moldy smell when starting.
Biological Growth on Evaporator and Drain Pan
Symptom
Indoor unit louvers do not move or are stuck in one position, but no error code is shown.
Louver Mechanism Jam / Partial Failure
Symptom
Indoor unit makes loud rattling or buzzing noises during operation.
Indoor Mechanical Noise / Vibration
Symptom
Indoor unit runs but no air comes out, or airflow is very weak even at high fan speed.
Restricted Indoor Airflow
Symptom
Outdoor unit makes loud grinding, squealing, or rattling noises.
Outdoor Mechanical Noise / Fan or Compressor Issue
Symptom
Remote control does not operate the unit, but indoor display lights are on.
Remote Control / IR Reception Issue
Symptom
The unit emits repeated clicking sounds but does not start cooling or heating.
Relay Operation Without Compressor Start
Symptom
Unit frequently turns on and off (short cycling) without reaching set temperature.
Short Cycling / Improper Control
Symptom
Unit runs in heating mode but delivers only lukewarm air and room does not heat up.
Poor Heating Performance (Heat Pump Models)
Symptom
Unit starts, then stops after a few minutes without any error code; the fan may continue to run.
Thermal Protection / Overheating Without Displayed Code
Symptom
Unit trips the circuit breaker when starting or during operation.
Electrical Overload / Short Circuit
Symptom
Water dripping from outdoor unit or excessive water around base.
Outdoor Condensate / Defrost Water Drainage Issue
Symptom
Water dripping from the front of the indoor unit or onto the wall.
Indoor Unit Water Leakage
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
The indoor unit will not start; the display shows E01 shortly after power-on.
|
Indoor-Outdoor Communication Failure | View Details |
| E02 |
The indoor unit stops shortly after starting; the display shows E02 and the compressor does not run.
|
High-Pressure Protection / Overpressure Trip | View Details |
| E03 |
The indoor unit stops cooling and displays E03; sometimes accompanied by ice on the indoor coil.
|
Low-Pressure / Refrigerant Undercharge Protection | View Details |
| E04 |
The unit stops and displays E04; this sometimes occurs during very hot operation or after a long runtime.
|
Compressor Overload / Overheat Protection | View Details |
| E05 |
Indoor unit runs briefly then stops; the display shows E05, and the unit may blow only fan air.
|
Indoor Room Temperature Sensor (NTC) Fault | View Details |
| E06 |
The unit stops and displays E06; cooling or heating does not start properly.
|
Indoor Evaporator Coil Temperature Sensor Fault | View Details |
| E07 |
The outdoor unit does not start; the indoor unit shows E07, and only the fan may run.
|
Outdoor Condenser Coil Temperature Sensor Fault | View Details |
| E08 |
The unit attempts to start but stops with E08; the compressor does not run.
|
Compressor Overcurrent / Inverter Module Protection | View Details |
| E09 |
The indoor unit shows E09; the unit may run only in limited mode or stop frequently.
|
EEPROM / Memory Error on Indoor PCB | View Details |
| E10 |
The unit displays E10 and stops; this often occurs during heating mode on heat pump models.
|
Defrost Sensor / Defrost Protection Error | View Details |
| E11 |
The indoor unit shows E11; the louver may not move, and airflow direction cannot be adjusted.
|
Indoor Louver Motor / Stepper Motor Fault | View Details |
| E12 |
The unit displays E12; the indoor fan may not start or runs erratically.
|
Indoor Fan Motor Fault | View Details |
| E13 |
The unit shows E13; the outdoor fan does not run or runs intermittently.
|
Outdoor Fan Motor Fault | View Details |
| E14 |
The indoor unit shows E14; the unit may not respond to the remote or operates erratically.
|
Indoor PCB Communication / Keypad Interface Error | View Details |
| E15 |
Unit displays E15; compressor does not start, and the outdoor unit remains off.
|
Outdoor-Indoor Communication Error | View Details |
| E16 |
Unit displays E16; the compressor starts then quickly stops, or does not start at all.
|
Phase / Power Supply Protection (for certain models) | View Details |
| E17 |
Unit displays E17; sometimes associated with poor cooling and frequent stops.
|
Discharge Pipe Temperature Sensor Fault | View Details |
| E18 |
Unit displays E18; it may shut down unexpectedly during operation.
|
Condensate Pump / Drain Pump Fault (for cassette or ducted models) | View Details |
| E19 |
Unit displays E19; the remote control does not seem to communicate properly.
|
Indoor IR Receiver / Remote Communication Fault | View Details |
| E20 |
Unit displays E20; Wi-Fi or smart control functions do not operate correctly (on connected models).
|
Wi-Fi Module / Smart Interface Error | View Details |
| – |
Air conditioner does not start at all; no lights on the indoor unit.
|
No Power / Dead Indoor Unit | View Details |
| – |
Air conditioner runs but does not cool the room effectively; air from the indoor unit is only slightly cool.
|
Insufficient Cooling Capacity / Performance Loss | View Details |
| – |
Burning or electrical smell from indoor or outdoor unit.
|
Overheating Electrical Component | View Details |
| – |
Indoor unit display is blank or segments are missing, but the unit still operates.
|
Display Panel / LED Segment Failure | View Details |
| – |
Indoor unit emits a musty or moldy smell when starting.
|
Biological Growth on Evaporator and Drain Pan | View Details |
| – |
Indoor unit louvers do not move or are stuck in one position, but no error code is shown.
|
Louver Mechanism Jam / Partial Failure | View Details |
| – |
Indoor unit makes loud rattling or buzzing noises during operation.
|
Indoor Mechanical Noise / Vibration | View Details |
| – |
Indoor unit runs but no air comes out, or airflow is very weak even at high fan speed.
|
Restricted Indoor Airflow | View Details |
| – |
Outdoor unit makes loud grinding, squealing, or rattling noises.
|
Outdoor Mechanical Noise / Fan or Compressor Issue | View Details |
| – |
Remote control does not operate the unit, but indoor display lights are on.
|
Remote Control / IR Reception Issue | View Details |
| – |
The unit emits repeated clicking sounds but does not start cooling or heating.
|
Relay Operation Without Compressor Start | View Details |
| – |
Unit frequently turns on and off (short cycling) without reaching set temperature.
|
Short Cycling / Improper Control | View Details |
| – |
Unit runs in heating mode but delivers only lukewarm air and room does not heat up.
|
Poor Heating Performance (Heat Pump Models) | View Details |
| – |
Unit starts, then stops after a few minutes without any error code; the fan may continue to run.
|
Thermal Protection / Overheating Without Displayed Code | View Details |
| – |
Unit trips the circuit breaker when starting or during operation.
|
Electrical Overload / Short Circuit | View Details |
| – |
Water dripping from outdoor unit or excessive water around base.
|
Outdoor Condensate / Defrost Water Drainage Issue | View Details |
| – |
Water dripping from the front of the indoor unit or onto the wall.
|
Indoor Unit Water Leakage | View Details |
No matching codes found
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