LO
Honeywell Low Ambient Temperature Lockout

Dehumidifier display shows "LO" and the unit does not run or runs intermittently.

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Possible Causes

Room temperature below operating range, Faulty ambient temperature sensor reading too low, Unit placed near cold window or draft, Control board misreading sensor

How to Fix / Troubleshooting

Safety: No internal work is required for basic checks; unplug before opening the cabinet.

Steps:

  • Check room temperature: Verify the room is above the minimum operating temperature (typically 41°F / 5°C). Move the unit to a warmer area if needed.
  • Avoid cold drafts: Do not place the dehumidifier directly on a cold concrete floor or next to a cold window where the sensor can be fooled by localized cold air.
  • Power reset: Unplug for 5 minutes and restart. If LO persists in a warm room, the ambient sensor may be faulty.
  • Inspect and test sensor: Access the ambient temperature sensor near the air intake, check wiring, and test resistance. Replace if readings are out of spec.

Note: LO is often a normal protection indication in cold basements; the unit will resume operation automatically when the room warms up.

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Repair Difficulty

Easy 2/5

Required Part

Ambient Temperature Sensor (NTC Thermistor)
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