11 L smart tower ultrasonic humidifier with a water-pump feed system, app/touch/voice control, Auto Mode, and exact troubleshooting for pump noise, leaks, and no-mist complaints.
Choose the observed symptom, light, code, app state, or output problem.
The HM735S no-mist path is unusually specific because the tower uses a pump-fed water path. Dreo says to check the air inlet, reservoir water level, room ventilation, Auto Mode target, atomizer scale, and then allow about 15 seconds for the pump to move water after the inlet tank has run dry.
For an HM735S leak, first dry the unit and identify where fresh water appears. Dreo’s current model FAQ points to a cracked tank, the outlet-valve silicone sealing ring, room humidity above about 60%, excess water around the unit, movement of a filled humidifier, and level placement.
A short, slight pump sound can be normal on the HM735S because this model actively transfers water. Dreo specifically says a brief noise when the pump starts is normal; the useful diagnosis is whether the sound is short and mild or becomes loud, prolonged, grinding, or accompanied by poor water transfer.
| Fact | Detail |
|---|---|
| Humidifier type | ultrasonic |
| What you should see | Visible mist is expected while mist output is active. |
| Model / SKU identifiers | HM735S · DR-HHM005S · Dreo 735S 11L |
| Exact guides published | 3 |
| Latest linked-guide review | September 4, 2026 |
| Official sources | Dreo HM735S official product page and FAQ; Dreo official product-support center |
Each row is one exact-model guide; the short answer is the same one shown on the guide.
| Symptom | Short answer | Guide |
|---|---|---|
| No mist / low mist | The HM735S no-mist path is unusually specific because the tower uses a pump-fed water path. Dreo says to check the air inlet, reservoir water level, room ventilation, Auto Mode target, atomizer scale, and then allow about 15 seconds for the pump to move water after the inlet tank has run dry. | Dreo HM735S Has Power but No Mist |
| Water leak / puddle | For an HM735S leak, first dry the unit and identify where fresh water appears. Dreo’s current model FAQ points to a cracked tank, the outlet-valve silicone sealing ring, room humidity above about 60%, excess water around the unit, movement of a filled humidifier, and level placement. | Dreo HM735S Is Leaking Water |
| Water pump noise / brief pumping sound | A short, slight pump sound can be normal on the HM735S because this model actively transfers water. Dreo specifically says a brief noise when the pump starts is normal; the useful diagnosis is whether the sound is short and mild or becomes loud, prolonged, grinding, or accompanied by poor water transfer. | Dreo HM735S Water Pump Is Making Noise |
