LO
Tosot
Low Temperature Protection / Ambient Temperature Below Operating Range
Humidifier or dehumidifier displays LO and does not operate normally; may not start or may run only fan.
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Possible Causes
Room temperature below minimum operating spec, Faulty ambient temperature sensor reading too low, Unit placed near cold draft or window
How to Fix / Troubleshooting
Steps:
- Check room temperature: Use a separate thermometer. If the room is below about 41–50°F (5–10°C), move the unit to a warmer location.
- Avoid cold drafts: Do not place the unit directly in front of open windows, exterior doors, or unheated basements where cold air can hit the sensor.
- Sensor check: If the room is warm but LO still shows, inspect the ambient temperature sensor and wiring as described for E1. Replace if defective.
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Repair Difficulty
Easy
2/5
Required Part
Ambient Temperature Sensor (Room NTC Thermistor)
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