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how to tell if furnace humidifier is working
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Do you want to know how to tell if your furnace humidifier is working? Humidifiers are an important part of home comfort systems, as they add humidity to the air and help regulate temperature. Having a properly functioning humidifier can make a big difference in how comfortable your home feels. But how do you know if it’s actually doing its job?

This article will provide tips on how to tell if your furnace humidifier is working correctly. We’ll discuss how to check for proper operation and maintenance, as well as what signs may indicate that something isn’t quite right with the unit. By understanding these basics, you’ll be able to identify any potential problems before they become more serious issues.

Checking the Humidistat

A furnace humidifier is one of the best ways to maintain a comfortable and healthy indoor environment during winter. However, if your humidistat is not working correctly, it can lead to poor indoor air quality and even damage your home.

The humidistat is a humidifier’s brain. Its primary function is to measure the humidity level and, based on that measurement, turn the humidifier on or off. When the humidity level is low, the humidistat will turn on the humidifier, adding moisture to the air and making breathing more comfortable.

To check if the humidistat is working correctly, you should first turn on the furnace and adjust the humidistat to a high level. Wait for a few minutes to see if the humidifier starts working. If it doesn’t, you can test the humidistat using a voltmeter. Set the voltmeter to the “OHMS” setting and check for continuity between the wires connecting to the humidistat. If the voltmeter reads zero, the humidistat is working correctly.

Checking the Water Flow

Proper water flow is essential to the functioning of your humidifier. The water flows from the main system into the humidifier before releasing it into the air to increase moisture levels. If the water is not flowing correctly, it won’t be able to saturate the wick or pad, so the humidifier won’t work effectively. Maintaining proper water flow to the humidifier is essential to ensure that it is operating at peak efficiency.

To check if the water is flowing correctly, turn off the furnace and humidifier, then remove the cover of the humidifier. Look for the water inlet, which should be connected to a solenoid valve. This valve can be turned off or on, allowing or preventing water from flowing into the humidifier. When you turn the humidifier on, the solenoid valve should open, allowing water to flow. If there is no water flow, check the valve for debris or obstruction, and clean the valve, if necessary.

If the water flow is low or absent from the humidifier, you may need to do some troubleshooting. First, check to see if there is adequate water pressure to the solenoid valve. You can test the water flow from the furnace’s valve. If there is low pressure, you may need to call a professional to help you diagnose and fix the issue. Another reason for low water flow can be a clogged filter or a mineral buildup. If your humidifier’s filter is dirty or mineralized, clean or replace the filter and perform regular maintenance to prevent further buildup.

Checking the Airflow

Proper airflow is essential for the efficient operation of a humidifier. It’s not enough to have a functioning humidifier. It must also add moisture to the air to make your home comfortable and healthy.

Dry air affects your home in many ways. It can lead to dry, itchy skin, sore throats, and nasal congestion. It can also cause static electricity and damage to furniture and flooring. Maintaining appropriate humidity levels in your home is crucial to avoid these issues.

Testing the airflow is crucial in troubleshooting if your humidifier is not adding moisture to the air. One way to test the airflow is to place tissue paper before the air vent while the humidifier runs. If the tissue moves slightly, it indicates that the humidifier is adding moisture to the air. You can also use a hygrometer to test your home’s humidity level. If it’s below the recommended level, it could indicate low airflow.

Checking the Humidity Level

Maintaining proper humidity levels in your home is essential to your health and comfort. Low humidity levels can lead to dry skin, itchy eyes, and respiratory issues, while high humidity levels can cause mould growth and damage to your home’s structure. Using a humidifier and maintaining proper humidity levels can prevent these issues and ensure that your home is a comfortable and healthy environment.

A hygrometer is a device that measures the humidity level in your home. It can be either analog or digital, and both types work similarly. Analog hygrometers use a needle and a dial to measure humidity levels, while digital hygrometers display the humidity level numerically on a screen. Hygrometers are affordable and easy to use, making them a convenient way to check the humidity level in your home.

To use a hygrometer to check the humidity level, place the device in the room you want to measure for at least 20 minutes. It will give the hygrometer enough time to adjust to the room’s temperature and humidity. Once the hygrometer has stabilized, read the humidity level, typically displayed as a percentage on the device’s screen.

If the humidity level is below 30%, it’s an indication that the air is too dry, and you may need to adjust the humidifier’s settings accordingly. If the humidity level is above 60%, it’s an indication that the air is too humid, which can lead to mould growth and other issues.


Knowing if a furnace humidifier works is essential for maintaining healthy and comfortable air in your home. Checking the water flow, airflow, and humidity level are all key steps for troubleshooting any issues with your humidifier. If your humidifier isn’t performing as it should be, consider doing basic maintenance or calling a professional for help. With regular inspections and maintenance, you can ensure that your furnace humidifier is always working properly.

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