Frigidaire Dehumidifier LO Code — How to Fix

What Does This Error Mean?

Frigidaire Dehumidifier LO means the room temperature has dropped below the unit's safe operating minimum — typically 41°F (5°C). Running a dehumidifier in near-freezing conditions causes frost to form on the coils, blocking airflow and potentially damaging the compressor. The unit pauses automatically and resumes when the temperature rises above the threshold.

Affected Models

Frigidaire FFAD5033W1
Frigidaire FFAD7033W1
Frigidaire FAD954DWD
Frigidaire FGAC7044U1
Frigidaire FFAP7033T1

Common Causes

The room temperature has dropped below 41°F (5°C) — the dehumidifier's minimum rated operating temperature
The dehumidifier is being used in a garage, basement, or crawl space that gets very cold in winter
A window or door left open in cold weather dropped the room temperature below the operating limit

How to Fix It

Understand that LO is a protective pause, not a fault

LO does not mean the dehumidifier is broken. It is a temperature protection feature that prevents coil icing and compressor damage. The unit will resume operation automatically once the temperature rises above the threshold — no user action is required in most cases.
Check the room temperature with a thermometer

Frigidaire dehumidifiers are rated for operation at 41°F (5°C) and above. If the room is genuinely below this temperature, the LO code is expected and correct behaviour. The dehumidifier will start working again once the room warms above 41°F.
Use a space heater to warm the room before running the dehumidifier

In cold basements or garages, running a space heater to bring the temperature above 50°F before starting the dehumidifier ensures reliable operation. Some users run the heater and dehumidifier together — the heater keeps the temperature above the LO threshold while the dehumidifier removes moisture.
Consider a low-temperature dehumidifier if the room stays cold

Standard refrigerant dehumidifiers like Frigidaire models cannot operate below 41°F (5°C). If you need to dehumidify a space that stays cold year-round (below 50°F), consider a desiccant dehumidifier — these work at temperatures as low as 33°F (1°C) and are designed for cold, damp spaces.
Close windows and doors to keep warmth in if LO is seasonal

If LO appears seasonally as temperatures drop, seal drafts and keep the basement or garage door closed when possible. Insulating cold spaces helps maintain temperatures above the LO threshold without additional heating, allowing the dehumidifier to operate through more of the year.

Frequently Asked Questions

Will the Frigidaire dehumidifier restart automatically when the room warms up?

Yes — the LO protection is fully automatic. Once the temperature sensor reads above the cut-in threshold (typically 45–50°F / 7–10°C, slightly above the cut-off), the dehumidifier restarts its compressor and resumes normal dehumidification without any button press.

Is there a dehumidifier mode that works in cold rooms?

Some Frigidaire models include a Fan Only or Air Circulation mode that runs the fan without the compressor — this mode has no temperature restriction. While it does not actively remove moisture, it can help prevent mould by circulating air. For actual dehumidification below 41°F, a desiccant-based dehumidifier is the correct tool.