VERIFIED MODEL HUB · 3 EXACT GUIDES

Honeywell HEV320 troubleshooting

Quiet Comfort cool-moisture evaporative humidifier using the HC-888 wick; normal output is invisible moisture rather than visible fog.

Humidifier type
evaporative

What should you see?
Visible fog is not expected; use airflow, wick, water-use, and humidity checks instead.

Exact issue guides

Choose the observed symptom, light, code, app state, or output problem.

3 verified

No visible mist

No visible fog is expected on the HEV320. It is an evaporative cool-moisture model, so the fan moves invisible moisture from a wet wick.

Low humidity output

Start with the HC-888 wick. Hard-water minerals can load the wick and reduce evaporation even while the fan still runs.

Hard or crusty wick

A hard or crusty HC-888 wick is a replacement signal, especially when output is also dropping.