Today we will be looking at Why a Honeywell Thermostat Fan Won’t Turn Off? It’s not unusual for a Honeywell thermostat fan to start running before warming or stop running after cooling down.
However, a Honeywell fan that refuses to turn off and continues to run for hours on end may indicate a problem.
If your thermostat fan won’t turn off, you’re probably dealing with one of three issues: The “manual override” setting on your Honeywell Thermostat fan limit switch is on. The fan limit switch needs to be changed because it is broken, or there’s a problem with the wiring in your thermostat.
Let’s have a look at some other reasons as to why the fan won’t turn off.
Reason Why Honeywell Thermostat Fan Won’t Turn Off?
Is the Honeywell thermostat fan still on? That’s not typical, to say the least. If your fan won’t turn off, you’re probably dealing with one of the below issues:
- Bad Sensors.
- Extreme Temperatures.
- Your Honeywell thermostat fan limit switch is set to “manual override”.
- Thermostat Settings.
- The thermostat’s fan select switch is set to manual “ON.”
Sometimes it can be hard to determine what the issue might be without first trying to resolve it, and ruling out different causes.
In this regard, we’ve devised a variety of strategies to assist you in recognizing and, ideally, tackling the problem and permanently resolving it.
Honeywell Thermostat Fan Not Turning Off: Troubleshooting Methods
The fan is responsible for transferring hot or cool air from your Honeywell thermostat to your home.
When the thermostat senses that the target temperature’s been reached, the fan will be turned off to conserve energy. A malfunction in this device may be causing your fan to run continuously.
Method #1: Resetting a Honeywell Programmable Thermostat
Let’s start by doing a quick reset of the Honeywell device to see if that will get the thermostat up and running as expected.
- By pushing the “Off” button, you can turn off the thermostat.
- Insert a small coin-sized object into the slot to access the battery door.
- Disconnect the system’s batteries.
- Place the batteries backward so that the negative pole is parallel to the positive terminal.
- Replace the batteries in the gadget in the correct order.
- Close the battery compartment door.
Method #2: Thermostat Controls
On Honeywell thermostats, the selection button for the fan usually has two (sometimes three) settings: which are On, Auto, and Circ, depending on the model (for circulate).
Note: Make sure your thermostat’s fan is set to AUTO rather than ON.
The On Button:
The On setting allows you to turn on the fan and have it run continuously. When you select this option, the fan will operate whether or not the cool or heat settings are turned on.
The Auto Button:
When the thermostat is set to Auto, the fan will continue to run in tandem with the heat or cool system anytime they are turned on.
This function prevents the fan from running unless one of the temperature units is operational. Because it saves energy, this is the ideal setting.
The Circ Button:
Finally, the Circ. setting would enable the fan to operate at a rate of approximately 20 minutes per hour.
It’s typically saved for seasons when the internal temperature will not require any heating or cooling, such as spring and autumn.
As a result, if you set your thermostat to On rather than Auto, your fan will run continuously and will not turn off.
How to Adjust a Honeywell Thermostat’s Temperature
Linking back to the above settings and how that could affect your Thermostat fan from turning off, below we have some steps on how to change the Thermostat settings:
Step #1. Toggling between Auto, On, and Circulate is as simple as pressing the fan button.
Step #2. Cycle through the modes until you find the one you want, then press the button to activate it.
Method #3: Sensors That Are Defective
Your Honeywell thermostat fan won’t turn off because of a bad sensor.
Consider this: if your temperature sensor is broken, your thermostat is effectively blind.
When a sensor can’t accurately determine the temperature of a room, it sends erroneous data to the thermostat. As a result, the thermostat may be prompted to keep the fan running even if it isn’t needed.
- Get a digital thermometer.
- Record the temperature of the room
- Cross-reference the temp from the thermostat against the digital thermometer.
If the room temperature displayed on the thermostat and the temperature on the thermometer differ, you’ve discovered the source of the problem.
Method #4: Incorrect Thermostat Wiring
The fan is usually controlled by a separate cable on most modern thermostats. It’s green in color and connects to the back of your thermostat’s G terminal.
Most new thermostats, on the other hand, require an additional C-wire, which many home systems lack.
As a result, technicians frequently rebuild the fan wire as the C-wire, leaving no wire connected to the G terminal. Because the fan is not regulated solely by the thermostat in this situation, it will run continuously.
- Check if your thermostat requires a C-wire to operate.
- Remove the thermostat’s cover to show the backplate if this is the case.
- If there isn’t a wire connected to the G terminal, you may need to replace the wiring to fix the fan.
- If the wire needs to be replaced, call a technician.
Method #5: Limit Switch Functionality
Step 1. Find the Limit Switch for the Fan
The limit switch for the fan is normally towards the top right corner of the thermostat panel cover.
The limit switch is in charge of switching on and off the fan at the right moments.
Your Honeywell fan should start a few minutes after the thermostat requests for heat and turn off a few moments after the heat cycle stops if the switch is functioning correctly.
However, if the Honeywell fan runs continuously, whether or not the Honeywell is on, your fans limit switch seems to be either:
- Set it to Manual.
- Or it’s faulty, which means it needs to be repaired or replaced.
Now that you’ve found the fan’s limit switch, let’s see how you can tell if it’s set correctly or not.
Step 2. Check if The White Button Is Pressed
Double-check that the white button is not pressed.
A small white button will be located on the lower-left corner of the fan’s limit switch. This button controls whether the switch operates manually (i.e., the fan runs all the time) or automatically (run the fan only during heating cycles).
The switch is set to Manual and the fan is forced to operate constantly if the button is pressed in. You’ll need to change it to AUTO for the fan to work properly.
Step 3. Call a Technician
You’ll need to contact a technician if the fan’s limit switch is currently on AUTO but the Honeywell fan keeps running and it won’t stop.
The following are two issues that may make your fan run continuously:
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We hope that the above methods and steps have helped you to resolve the issue of the Honeywell thermostat fan won’t turn off, and you now have more knowledge as to why this issue may have occurred.
In conclusion, there are a few reasons why your Honeywell touchscreen thermostat fan won’t turn off. The main reason being that your thermostat is set to ON where it will run constantly, and this needs to be switch to Auto, where it will only work at certain times.
Another more technical issue is your Limit switch functionality is faulty and will need to be seen by a professional.
Should you need any further tips and tricks please do reach out to Honeywell’s customer support team.
Kevin has over five years of experience working in various Tech startups and providing Technical solutions. He has contributed to many Tech publications and websites.