Ariston Humidifiers & Dehumidifiers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Dehumidifier stops and displays E1 on the control panel; fan may still run but no dehumidification
Room Temperature Sensor Fault
E2
Dehumidifier displays E2 and stops cooling; fan may run intermittently
Evaporator Coil Temperature Sensor Fault
E3
Dehumidifier shows E3 and will not start the compressor; fan may still operate
Humidity Sensor (RH Sensor) Fault
E4
Dehumidifier displays E4 and shuts down; may occur after running for a short time
Refrigerant System Protection / High or Low Temperature Fault
E5
Dehumidifier shows E5 and will not start or stops shortly after starting
Compressor Overload / Overcurrent Protection
E6
Dehumidifier displays E6 and does not respond properly to button presses; some keys may not work
Keypad / User Interface Communication Error
E7
Dehumidifier shows E7 and stops; may be accompanied by unusual compressor noise or no cooling
Refrigerant System / Pressure Sensor Fault (if equipped)
E8
Dehumidifier displays E8 and stops operation; may occur after long runtime
Overheat Protection / High Discharge Temperature
E9
Dehumidifier shows E9 and will not start; sometimes appears after a power surge
EEPROM / Memory Error on Main Control Board
EC
Dehumidifier displays EC and stops dehumidifying; fan may still run
Refrigerant Leak / Low Refrigerant Protection
F0
Humidifier function (on combo units) shows F0 and stops adding moisture; fan may still run
Water Level Sensor / Float Switch Fault (Humidifier Mode)
F1
Humidifier mode displays F1; unit will not produce mist
Humidifier Temperature / Overheat Sensor Fault
F2
Humidifier mode shows F2; no mist output even with full tank
Mist Generator / Ultrasonic Transducer Fault
F3
Humidifier mode displays F3; unit may shut down for safety
Humidifier Overfill / Leak Detection Fault
H1
Humidifier mode shows H1; unit runs but cannot reach set humidity
Humidity Sensor Calibration / Range Error
P1
Dehumidifier displays P1 and stops; bucket is full or appears full to the unit
Bucket Full / Water Tank Full Detection
P2
Dehumidifier shows P2 and stops; continuous drain hose may be attached
Continuous Drain / Pump Protection Fault
Symptom
Dehumidifier bucket fills very quickly or overflows even with hose attached
Drainage Failure / Hose Not Draining
Symptom
Dehumidifier coils freeze up into a solid block of ice during operation
Evaporator Icing / Defrost Failure
Symptom
Dehumidifier display works but buttons do not respond or respond intermittently
Keypad / Touch Control Failure
Symptom
Dehumidifier does not power on at all; no lights or display
No Power / Dead Unit
Symptom
Dehumidifier emits a burning or electrical smell
Overheating Electrical Component
Symptom
Dehumidifier emits a musty or moldy odor from the air outlet
Biological Growth in Drain Pan and Coils
Symptom
Dehumidifier fan does not run, but compressor gets hot and may shut off
Fan Motor Failure
Symptom
Dehumidifier fan runs but compressor cycles on and off rapidly or hums loudly without starting
Hard Starting Compressor / Start Circuit Failure
Symptom
Dehumidifier frequently turns on and off; short cycling
Short Cycling / Control Instability
Symptom
Dehumidifier makes loud rattling or grinding noise during operation
Mechanical Noise / Fan or Mounting Fault
Symptom
Dehumidifier powers on but compressor and fan never start; only display works
Control Logic / Relay Failure
Symptom
Dehumidifier runs but does not collect water; room remains damp
No Dehumidification / Poor Moisture Removal
Symptom
Dehumidifier runs continuously and never reaches the set humidity
Inefficient Dehumidification / Undersized or Faulty System
Symptom
Dehumidifier vibrates excessively and may move on the floor during operation
Excessive Vibration / Imbalance
Symptom
Display shows unrealistic humidity readings (e.g., always 20% or always 90%)
Humidity Sensor Out of Range / Stuck Reading
Symptom
Humidifier mode causes water to pool around the unit or drip from the base
Humidifier Water Leak
Symptom
Humidifier mode causes white dust to settle on furniture
Mineral Dust Emission
Symptom
Humidifier mode produces very little or no mist even though the tank is full and no error is shown
Reduced Mist Output
Symptom
Humidifier or dehumidifier mode produces noticeable electrical interference (e.g., affecting radios nearby)
EMI / Electrical Noise from Motor or Driver
Symptom
Humidifier or dehumidifier mode shuts off after a few minutes and will not restart for a while
Thermal Overload / Overheat Shutdown
Symptom
Water leaks from the bottom of the dehumidifier onto the floor
External Water Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Dehumidifier stops and displays E1 on the control panel; fan may still run but no dehumidification
|
Room Temperature Sensor Fault | View Details |
| E2 |
Dehumidifier displays E2 and stops cooling; fan may run intermittently
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E3 |
Dehumidifier shows E3 and will not start the compressor; fan may still operate
|
Humidity Sensor (RH Sensor) Fault | View Details |
| E4 |
Dehumidifier displays E4 and shuts down; may occur after running for a short time
|
Refrigerant System Protection / High or Low Temperature Fault | View Details |
| E5 |
Dehumidifier shows E5 and will not start or stops shortly after starting
|
Compressor Overload / Overcurrent Protection | View Details |
| E6 |
Dehumidifier displays E6 and does not respond properly to button presses; some keys may not work
|
Keypad / User Interface Communication Error | View Details |
| E7 |
Dehumidifier shows E7 and stops; may be accompanied by unusual compressor noise or no cooling
|
Refrigerant System / Pressure Sensor Fault (if equipped) | View Details |
| E8 |
Dehumidifier displays E8 and stops operation; may occur after long runtime
|
Overheat Protection / High Discharge Temperature | View Details |
| E9 |
Dehumidifier shows E9 and will not start; sometimes appears after a power surge
|
EEPROM / Memory Error on Main Control Board | View Details |
| EC |
Dehumidifier displays EC and stops dehumidifying; fan may still run
|
Refrigerant Leak / Low Refrigerant Protection | View Details |
| F0 |
Humidifier function (on combo units) shows F0 and stops adding moisture; fan may still run
|
Water Level Sensor / Float Switch Fault (Humidifier Mode) | View Details |
| F1 |
Humidifier mode displays F1; unit will not produce mist
|
Humidifier Temperature / Overheat Sensor Fault | View Details |
| F2 |
Humidifier mode shows F2; no mist output even with full tank
|
Mist Generator / Ultrasonic Transducer Fault | View Details |
| F3 |
Humidifier mode displays F3; unit may shut down for safety
|
Humidifier Overfill / Leak Detection Fault | View Details |
| H1 |
Humidifier mode shows H1; unit runs but cannot reach set humidity
|
Humidity Sensor Calibration / Range Error | View Details |
| P1 |
Dehumidifier displays P1 and stops; bucket is full or appears full to the unit
|
Bucket Full / Water Tank Full Detection | View Details |
| P2 |
Dehumidifier shows P2 and stops; continuous drain hose may be attached
|
Continuous Drain / Pump Protection Fault | View Details |
| – |
Dehumidifier bucket fills very quickly or overflows even with hose attached
|
Drainage Failure / Hose Not Draining | View Details |
| – |
Dehumidifier coils freeze up into a solid block of ice during operation
|
Evaporator Icing / Defrost Failure | View Details |
| – |
Dehumidifier display works but buttons do not respond or respond intermittently
|
Keypad / Touch Control Failure | View Details |
| – |
Dehumidifier does not power on at all; no lights or display
|
No Power / Dead Unit | View Details |
| – |
Dehumidifier emits a burning or electrical smell
|
Overheating Electrical Component | View Details |
| – |
Dehumidifier emits a musty or moldy odor from the air outlet
|
Biological Growth in Drain Pan and Coils | View Details |
| – |
Dehumidifier fan does not run, but compressor gets hot and may shut off
|
Fan Motor Failure | View Details |
| – |
Dehumidifier fan runs but compressor cycles on and off rapidly or hums loudly without starting
|
Hard Starting Compressor / Start Circuit Failure | View Details |
| – |
Dehumidifier frequently turns on and off; short cycling
|
Short Cycling / Control Instability | View Details |
| – |
Dehumidifier makes loud rattling or grinding noise during operation
|
Mechanical Noise / Fan or Mounting Fault | View Details |
| – |
Dehumidifier powers on but compressor and fan never start; only display works
|
Control Logic / Relay Failure | View Details |
| – |
Dehumidifier runs but does not collect water; room remains damp
|
No Dehumidification / Poor Moisture Removal | View Details |
| – |
Dehumidifier runs continuously and never reaches the set humidity
|
Inefficient Dehumidification / Undersized or Faulty System | View Details |
| – |
Dehumidifier vibrates excessively and may move on the floor during operation
|
Excessive Vibration / Imbalance | View Details |
| – |
Display shows unrealistic humidity readings (e.g., always 20% or always 90%)
|
Humidity Sensor Out of Range / Stuck Reading | View Details |
| – |
Humidifier mode causes water to pool around the unit or drip from the base
|
Humidifier Water Leak | View Details |
| – |
Humidifier mode causes white dust to settle on furniture
|
Mineral Dust Emission | View Details |
| – |
Humidifier mode produces very little or no mist even though the tank is full and no error is shown
|
Reduced Mist Output | View Details |
| – |
Humidifier or dehumidifier mode produces noticeable electrical interference (e.g., affecting radios nearby)
|
EMI / Electrical Noise from Motor or Driver | View Details |
| – |
Humidifier or dehumidifier mode shuts off after a few minutes and will not restart for a while
|
Thermal Overload / Overheat Shutdown | View Details |
| – |
Water leaks from the bottom of the dehumidifier onto the floor
|
External Water Leak | View Details |
No matching codes found
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