Tosot
Tosot 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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CF
Dehumidifier displays CF after extended use; may continue to run but shows this reminder.
Filter Clean Reminder
E1
Dehumidifier stops and displays E1 on the control panel; buttons may not respond or unit will not start a cycle.
Room Temperature Sensor (Ambient Thermistor) Fault
E2
Dehumidifier displays E2 and will not run the compressor or fan.
Evaporator Coil Temperature Sensor Fault
E3
Dehumidifier shows E3 and shuts down or will not start dehumidifying.
Humidity Sensor (RH Sensor) Fault
E4
Dehumidifier displays E4 and stops; may occur after running for a short time.
Defrost Sensor / Frost Protection Fault
E5
Dehumidifier shows E5 and will not run the compressor; fan may still operate.
Refrigeration System / High or Low Pressure Protection Fault (Sensor or Circuit)
E6
Dehumidifier displays E6 and shuts down or will not start; may be accompanied by clicking from the control board.
Communication Error Between Display Board and Main Control Board
E7
Dehumidifier shows E7 and will not operate normally; may occur after a power surge.
EEPROM / Memory Error on Main Control Board
EC
Dehumidifier shows EC and stops dehumidifying; fan may still run.
Refrigerant Leak / Low Refrigerant or Sensor-Based Refrigeration Error
F0
Dehumidifier shows F0 and will not start or stops shortly after starting.
General Sensor Error / Sensor Circuit Abnormal
F1
Humidifier displays F1 and stops or will not start misting.
Water Level Sensor / Float Switch Fault (Humidifier Reservoir)
F2
Humidifier shows F2 and stops producing mist; fan may still run.
Ultrasonic Transducer / Nebulizer Fault (Humidifier)
F3
Humidifier displays F3 and shuts down; may occur after long operation.
Overheat Protection / Base Temperature Sensor Fault (Humidifier)
HI
Humidifier or dehumidifier displays HI for humidity and may not dehumidify effectively.
High Humidity Indication / Humidity Sensor Out of Range
LO
Humidifier or dehumidifier displays LO and does not operate normally; may not start or may run only fan.
Low Temperature Protection / Ambient Temperature Below Operating Range
P1
Dehumidifier displays P1 and stops dehumidifying; fan may run briefly then stop.
Defrost Mode Active / Low Coil Temperature Protection
P2
Dehumidifier displays P2 and stops; unit beeps and will not resume until addressed.
Bucket Full / Water Tank Full Protection
P3
Dehumidifier shows P3 and stops or will not start; may be intermittent.
Pump Protection / Pump Failure (Models with Built-in Pump)
P4
Dehumidifier displays P4 and stops; may occur shortly after startup.
Compressor Overload / Overheat Protection
Symptom
Dehumidifier compressor hums loudly then clicks off after a few seconds; fan runs but no water is collected.
Compressor Start Failure / Failed Start Relay or Overload
Symptom
Dehumidifier emits a musty or moldy odor from the air outlet.
Biological Growth in Water System and Coils
Symptom
Dehumidifier fan runs but compressor never starts; unit blows room-temperature air only.
Compressor Control Circuit Failure
Symptom
Dehumidifier frequently freezes up with ice covering most of the evaporator coil.
Evaporator Coil Icing
Symptom
Dehumidifier makes a loud grinding or scraping noise when the fan runs.
Blower Wheel or Fan Blade Damage
Symptom
Dehumidifier powers on but fan does not run; compressor may start briefly then shut off.
Fan Motor Failure or Obstruction
Symptom
Dehumidifier runs but does not collect water; humidity in the room remains high.
Loss of Refrigerant Charge / Weak Cooling System
Symptom
Dehumidifier short cycles, turning on and off every few minutes without reaching set humidity.
Short Cycling / Control or Sensor Issue
Symptom
Dehumidifier shuts off after a few minutes and the bucket is nearly empty; display may still be on.
False Bucket Full Detection
Symptom
Dehumidifier vibrates excessively or makes rattling noises during operation.
Excessive Vibration / Loose Mounts
Symptom
Dehumidifier will not power on at all; no lights or display.
No Power / Power Supply Failure
Symptom
Display is dim, flickering, or segments are missing, but the unit still runs.
Display Module Degradation
Symptom
Humidifier leaks water around the base or onto the table.
Tank or Seal Leak
Symptom
Humidifier or dehumidifier buttons do not respond or respond intermittently.
Keypad / Control Panel Failure
Symptom
Humidifier or dehumidifier emits a burning smell or visible smoke.
Electrical Overheating / Component Burnout
Symptom
Humidifier runs but produces little or no mist.
Reduced Humidification Output
Symptom
Humidifier shuts off even though there is still water in the tank.
False Empty Tank Detection
Symptom
Water leaking from the bottom or sides of the dehumidifier onto the floor.
Water Leak / Drainage System Fault
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| CF |
Dehumidifier displays CF after extended use; may continue to run but shows this reminder.
|
Filter Clean Reminder | View Details |
| E1 |
Dehumidifier stops and displays E1 on the control panel; buttons may not respond or unit will not start a cycle.
|
Room Temperature Sensor (Ambient Thermistor) Fault | View Details |
| E2 |
Dehumidifier displays E2 and will not run the compressor or fan.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E3 |
Dehumidifier shows E3 and shuts down or will not start dehumidifying.
|
Humidity Sensor (RH Sensor) Fault | View Details |
| E4 |
Dehumidifier displays E4 and stops; may occur after running for a short time.
|
Defrost Sensor / Frost Protection Fault | View Details |
| E5 |
Dehumidifier shows E5 and will not run the compressor; fan may still operate.
|
Refrigeration System / High or Low Pressure Protection Fault (Sensor or Circuit) | View Details |
| E6 |
Dehumidifier displays E6 and shuts down or will not start; may be accompanied by clicking from the control board.
|
Communication Error Between Display Board and Main Control Board | View Details |
| E7 |
Dehumidifier shows E7 and will not operate normally; may occur after a power surge.
|
EEPROM / Memory Error on Main Control Board | View Details |
| EC |
Dehumidifier shows EC and stops dehumidifying; fan may still run.
|
Refrigerant Leak / Low Refrigerant or Sensor-Based Refrigeration Error | View Details |
| F0 |
Dehumidifier shows F0 and will not start or stops shortly after starting.
|
General Sensor Error / Sensor Circuit Abnormal | View Details |
| F1 |
Humidifier displays F1 and stops or will not start misting.
|
Water Level Sensor / Float Switch Fault (Humidifier Reservoir) | View Details |
| F2 |
Humidifier shows F2 and stops producing mist; fan may still run.
|
Ultrasonic Transducer / Nebulizer Fault (Humidifier) | View Details |
| F3 |
Humidifier displays F3 and shuts down; may occur after long operation.
|
Overheat Protection / Base Temperature Sensor Fault (Humidifier) | View Details |
| HI |
Humidifier or dehumidifier displays HI for humidity and may not dehumidify effectively.
|
High Humidity Indication / Humidity Sensor Out of Range | View Details |
| LO |
Humidifier or dehumidifier displays LO and does not operate normally; may not start or may run only fan.
|
Low Temperature Protection / Ambient Temperature Below Operating Range | View Details |
| P1 |
Dehumidifier displays P1 and stops dehumidifying; fan may run briefly then stop.
|
Defrost Mode Active / Low Coil Temperature Protection | View Details |
| P2 |
Dehumidifier displays P2 and stops; unit beeps and will not resume until addressed.
|
Bucket Full / Water Tank Full Protection | View Details |
| P3 |
Dehumidifier shows P3 and stops or will not start; may be intermittent.
|
Pump Protection / Pump Failure (Models with Built-in Pump) | View Details |
| P4 |
Dehumidifier displays P4 and stops; may occur shortly after startup.
|
Compressor Overload / Overheat Protection | View Details |
| – |
Dehumidifier compressor hums loudly then clicks off after a few seconds; fan runs but no water is collected.
|
Compressor Start Failure / Failed Start Relay or Overload | View Details |
| – |
Dehumidifier emits a musty or moldy odor from the air outlet.
|
Biological Growth in Water System and Coils | View Details |
| – |
Dehumidifier fan runs but compressor never starts; unit blows room-temperature air only.
|
Compressor Control Circuit Failure | View Details |
| – |
Dehumidifier frequently freezes up with ice covering most of the evaporator coil.
|
Evaporator Coil Icing | View Details |
| – |
Dehumidifier makes a loud grinding or scraping noise when the fan runs.
|
Blower Wheel or Fan Blade Damage | View Details |
| – |
Dehumidifier powers on but fan does not run; compressor may start briefly then shut off.
|
Fan Motor Failure or Obstruction | View Details |
| – |
Dehumidifier runs but does not collect water; humidity in the room remains high.
|
Loss of Refrigerant Charge / Weak Cooling System | View Details |
| – |
Dehumidifier short cycles, turning on and off every few minutes without reaching set humidity.
|
Short Cycling / Control or Sensor Issue | View Details |
| – |
Dehumidifier shuts off after a few minutes and the bucket is nearly empty; display may still be on.
|
False Bucket Full Detection | View Details |
| – |
Dehumidifier vibrates excessively or makes rattling noises during operation.
|
Excessive Vibration / Loose Mounts | View Details |
| – |
Dehumidifier will not power on at all; no lights or display.
|
No Power / Power Supply Failure | View Details |
| – |
Display is dim, flickering, or segments are missing, but the unit still runs.
|
Display Module Degradation | View Details |
| – |
Humidifier leaks water around the base or onto the table.
|
Tank or Seal Leak | View Details |
| – |
Humidifier or dehumidifier buttons do not respond or respond intermittently.
|
Keypad / Control Panel Failure | View Details |
| – |
Humidifier or dehumidifier emits a burning smell or visible smoke.
|
Electrical Overheating / Component Burnout | View Details |
| – |
Humidifier runs but produces little or no mist.
|
Reduced Humidification Output | View Details |
| – |
Humidifier shuts off even though there is still water in the tank.
|
False Empty Tank Detection | View Details |
| – |
Water leaking from the bottom or sides of the dehumidifier onto the floor.
|
Water Leak / Drainage System Fault | View Details |
No matching codes found
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