How to Fix a Humidifier Not Misting

Overview

A humidifier that does not mist cannot improve air quality. This guide covers diagnosing and fixing the issue.

Step-by-Step Fix

1. Before doing any work on your humidifier, ensure it is completely switched off at the mains and unplugged from the wall socket for your safety. Wait a few moments to confirm it's powered down before proceeding to the next step.
2. Carefully lift off the water tank and pour out any remaining old water into a sink. Give the tank a good rinse with warm, soapy water, using a brush if needed, to remove any mould, mildew, or general grime, then rinse thoroughly and dry the inside as much as possible.
3. To tackle mineral buildup, empty the main unit's water reservoir (not the tank) and fill it with undiluted white vinegar, letting it soak for at least 20-30 minutes, or longer for heavy scale. After soaking, drain the vinegar and use a small brush or cotton bud to gently scrub any visible limescale from the ultrasonic disc or heating element before rinsing the reservoir thoroughly with clean water.
4. Once the unit is clean and reassembled, fill the water tank with fresh, clean tap water, ensuring it doesn't exceed the 'max fill' line. Plug the humidifier back in, switch it on, and observe it for a few minutes to see if a mist now appears.
5. If, after following all these steps, your humidifier still isn't producing mist, it's likely that a crucial internal component, such as the ultrasonic vibrator or fan, has failed. In this instance, as these parts are often not cost-effective or easy to replace for DIYers, it's usually best to consider purchasing a new unit.

Common Symptoms & Diagnostic Resolutions

Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.

Frequently Asked Questions