The part(s) or condition(s) listed below for the symptom Humidifier overflowing are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
Clean Dehumidifier Coils and Filters - Tech Tips from Repair Clinic
Humidifier Leaking? Humidifier Troubleshooting
Humidifier Overflowing? Humidifier Troubleshooting
Humidifier Drum Won't Turn? Humidifier Troubleshooting
Humidifier Fan Not Working? Humidifier Troubleshooting
Humidifier Not Getting Water? Humidifier TroubleshootingThe drain hose might be kinked or clogged. First check to make sure the drain hose is not kinked between the humidifier and the drain source. If the drain hose is not kinked, then it might be clogged. Unclog the drain hose by removing it from the drain pan and blowing compressed air through it to clear the obstruction.
On flow-through style humidifiers, a water panel distribution tray rests on top of the wick filter or water evaporator pad to channel the incoming water through the filter or pad. If the distribution tray is clogged with mineral deposits or damaged, the incoming water can easily overflow. Inspect the water panel distribution tray for obstructions or damage and replace with a new one if necessary.
On some flow-through style humidifiers, a filter holder secures the top of the wick filter or water evaporator pad and channels the incoming water through the filter or pad. If the filter holder is clogged with mineral deposits or damaged, the incoming water can easily overflow. Inspect the filter holder for obstructions or damage and replace with a new one if necessary.
Flow-through style humidifiers channel the water through a vertical water evaporator pad. If the water evaporator pad is clogged with calcium or other mineral deposits, the water will ride along the top of the pad and drip down outside of the water collection tray at the bottom. If water does not exit properly check the water evaporator pad and replace as needed.
On flow-through style humidifiers, a water drip tray rests on top of the wick filter or water evaporator pad to channel the incoming water through the filter or pad. If the drip tray is clogged with mineral deposits or damaged, the incoming water can easily overflow. Inspect the drip tray for obstructions or damage and replace with a new one if necessary.
The outlet of the humidifier drain pan may be clogged with mineral deposits. To clear the drain outlet the front panel or housing can be removed to access the port to the drain hose. Use a straightened paper clip to gently clear the deposits from the pan outlet. In some cases, the pan can be removed from the unit for clearing & cleaning.
A drum style humidifier will use a float to regulate the amount of water entering the humidifier. When the tray fills with water to a certain point, the float will rise up and shut off the water. A damaged float may not be able to shut off the water, resulting in the humidifier overflowing. Inspect the float to determine if it is obstructed or damaged and replace if necessary.
