Symptoms
- Bubbling or gurgling sound, especially after refilling
- Noise louder when the tank is nearly empty
- Gurgling continues nonstop rather than settling down
- Sound changes when the unit is moved
Likely causes
- CommonNormal air bubbles releasing as the tank feeds water into the baseA brief gurgle after refilling or when the tank runs low is expected in most tank-style humidifiers.
- CommonTank not seated flush against the baseAn uneven seal lets air in unevenly, causing louder or more frequent gurgling.
- PossibleVery low water levelAs the tank nears empty, the feed valve gurgles more as air replaces the departing water.
- PossibleUnit sitting on an uneven or unlevel surfaceTilting can disrupt the normal water feed and increase noise.
What to do
- Remove the tank and reseat it firmly and evenly on the base, listening for the gurgling to settle within a minute or two.
- Refill the tank if it's getting low, since gurgling often increases near empty.
- Move the unit to a level, hard surface if it's currently on carpet or an uneven stand.
- Check the rubber seal or valve on the tank's underside for debris or mineral buildup and clean it gently.
- Note whether the gurgling is occasional (normal) or constant and loud throughout operation (worth investigating further).
- If constant loud gurgling continues even with a level, well-seated, full tank, consider cleaning the internal float valve or checking the manual for that model's specifics.
Tools and parts
- Cloth
When to call a pro
No professional service is typically needed for this; it's rarely a sign of a serious fault.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.