Honeywell Thermostat heat not working on auto? Causes and solutions

May 28, 2024 - Views: 799

Rating:5.0 - 52Votes

You've noticed that Honeywell Thermostat heat not working on auto? You are not alone. 

The Honeywell thermostat has an auto option that assists in maintaining a set room temperature.

Many users have had problems with the auto-schedule working time.

In this post, we will go through the possible causes of Honeywell heater not working and how to effectively fix it.

So, check it out!

Fix Honeywell Thermostat heat not working on auto

Fix Honeywell thermostat not working on auto

Why is Honeywell Thermostat heat not working on auto?

Users seldom run into trouble with their Honeywell's auto mode, but when they do, the cause is usually a broken blower.

Let's check out the blower for the time being and look at the most common problems that may be readily handled at home.

Why is Honeywell Thermostat heat not working on auto?

Config problem

It is feasible that you believe you have activated the auto mode correctly, but it is really disabled. 

Make sure the switch is set to "Heat" rather than "Cool."

Low battery

A low battery may also cause your Honeywell thermostat auto not working, requiring you to charge it.

You could be having a lot of hardware and software issues if the battery in your thermostat has failed.

Low battery

Data problem

Corrupted data may have a significant influence on your thermostat's firmware and prevent you from using any of the thermostat's functionalities.

When you are in a situation where the Honeywell thermostat auto mode not working, you should think about this cause. 

Wiring problem

The sensitive cables inside the thermostat device are really able to be damaged easily when they’re exposed outside.

If the position of your thermostat has been damaging the wires over time, you will notice not just auto feature difficulties but also overall function incapacity.

If it also the reason why Honeywell Thermostat turns on and off frequently.

Hardware blower issues

In some cases, the blower will not switch on automatically, and the heater will be turned off due to overheating. 

If the battery fails, you will also face hardware issues.

Honeywell thermostat not working can be due to hardware blower issues

Software problem

Outdated firmware and damaged data or files may conflict with your thermostat's auto choices. 

Such problems are generally resolved by performing a factory reset or reinstalling and remounting your thermostat.

Sensor issue

If the sensor itself is destroyed, it will be unable to follow the auto-configuration.

Sensors cannot be changed, hence such problems are usually categorized as hardware problems.

How to fix Honeywell Thermostat heat not working on auto?

Auto setting on thermostat not working? Don’t worry! 

We'll walk you through some troubleshooting steps that could assist you in fixing a Honeywell Thermostat auto mode with this issue.

Check out these steps!

How to fix Honeywell Thermostat heat not working on auto?

Check All the Wires

The first thing you should do is make sure your wiring is in good working order.

A wire may be too short or damaged. In any situation, you must inspect all of your wiring. 

So, take the thermostat off the wall and inspect the wiring.

Check every single wire back there for any shorts or damage. 

Also, twist the G, R, and W wires together to confirm nothing is amiss with them.

Check All the Wires

If you believe there is nothing wrong with the wires—that everything is intact and appears good - you may need to get expert assistance to fix the issue.

Restart/reset Thermostat

A false alert might cause you to question whether or not your thermostat is operating properly. 

As a result, the first thing you should do is reset your thermostat to see if it helps.

Troubleshooting before restarting your thermostat may be unnecessary, since everything might be addressed with a simple system reset.

Restart/reset Thermostat

Here's how to manually restart your thermostat.

  • Make sure your thermostat's auto mode is turned off and the device is turned on. Switch the thermostat to the off position to turn it off.

  • Locate and deactivate the breakers that power your HVAC system.

  • Hold this position for around 30 seconds before turning on the breaker.

  • Finally, switch on the thermostat and check to see whether the auto mode now works!

It is recommended that you reset your thermostat periodically in order to avoid unexpected power outages.

Notably, you can apply this method to solve the problem of Nest Thermostat blinking green when charging.

Turn on the heating

If your Honeywell thermostat auto setting is inactive, you probably haven't selected the "heat" option in the thermostat's menu.

The "heat" option may be found in the thermostat's menu, where you select the auto settings.

Turn on the heating

Keep in mind that the auto settings will activate the existing thermostat sets you've selected.

If you haven't selected to heat in the menu, the Honeywell thermostat not heating, it seems that the auto feature isn't operating.

Program the Thermostat

If your Honeywell thermostat is programmable, check sure it is set to the temperature you want it to function at.

You must have configured your thermostat to operate in "heating" mode at the correct time of day, or else the auto feature will not function properly.

Here's how to properly configure a Honeywell thermostat:

  • Step 1: Navigate to your thermostat's settings.

  • Step 2: Open the auto menu and navigate to the day configuration.

  • Step 3: Set a certain time of day and select “heating”.

  • Step 4: Press the Set button to save the setup.

Your thermostat will now enable 'heating' automatically "mode, at the time you specify.

Check auto settings and update

If your thermostat's auto mode is somewhat unreal or does not cover your furnace's capability, the auto mode will most likely be disabled.

The thing you should do here is make sure that the auto performance settings you specified fit the requirements of the remainder of your system.

In other words, before turning on the thermostat on auto again, double-check the settings.

Check auto settings and update

If you've made any changes, make sure to restore them to their original state and test the auto settings again.

Furthermore, look for the correct settings configuration for your thermostat model and align them to eliminate the likelihood of a defective thermostat.

Note: Keep in mind that if your thermostat software is out of current, you may encounter malfunctions.

Look for an Update tab and any pending updates in your thermostat's menu.

Factory default

If the thermostat's auto setting is still not working, it's necessary to take more serious actions. 

The so-called factory reset will return your device to the state it was in when it was first opened.

All settings and setups will be lost indefinitely.

Here's how to reset your thermostat to factory settings:

  • Look for the reset button on the panel.

  • For at least 10 seconds, press and hold the reset button.

This process should return your thermostat to its default settings, and the auto-settings should function normally.

Factory default

Inspect limit control

If the problem hasn't been resolved by now, there's an easy technique to figure out which part is preventing the automatic heating.

You will now witness each step of the process in operation and will know what to replace based on what does not start.

Extremely careful with the instructions and avoid touching any wires, as you may be electrocuted.

Also, avoid touching or twisting the round dial.

Here's way to figure out which portion isn't working:

  • To access the controls, open the front furnace door

  • Find the fan limit switch (usually at the bottom left corner and fashioned like a white cylindrical button)

  • Turn the heat up to high

  • The burner should start

  • The limit control dial should begin to rotate

  • The blower should turn on

Inspect limit control

If only the AUTO function is not working, the blower will most likely not start, indicating a problem with the temperature sensor.

If you can confirm that by personally inspecting the controls, you'll need to bring the thermostat in for repair.

Replace your Thermostat if it’s faulty

Though it might be difficult to accept, the reason your Honeywell thermostats aren't working on auto is because the thermostat is defective and has to be replaced. 

If the techniques outlined above were ineffective in repairing your thermostat, it might be time to replace it.

Replace your thermostat 

Get a new one or a newer one (if your current model is obsolete) to experience all of the amazing features the thermostat has to offer, such as automatic temperature management.

Contact Honeywell Support Team or an HVAC professional

Assuming the problem is not caused by the wires, the next step is to contact the Honeywell support team. 

Honeywell has plenty of seasoned personnel that deal with situations like these all day.

However, while dealing with a representative, make sure you cover all aspects of the problem. 

This will assist them in determining what steps to take to restore your thermostat's functionality.

On the one hand, you may wish to contact a local HVAC specialist to address the problem as soon as possible. 

As previously said, an HVAC specialist would examine the entire thermostat (including the furnace) to determine what went wrong.

Contact Honeywell Support Team or an HVAC professional

Besides Honeywell Thermostat‘s problem, our blog also provides information on your Internet connection, such as how to run a wifi speed test.

Further than that, you can get tips to fix slow WiFi speeds

So great, right?

Frequently Asked Questions (FAQs)
Why is my furnace blowing cold air when the heat is on?

One typical reason for this is a dirty filter. 

Even when the heat is turned on, the furnace may blast chilly air. How? 

A filthy heater clogs the furnace's heat exchanger, causing it to overheat. 

This stops the pilot light from igniting and, as a result, from producing any heat.

How do I set my Honeywell thermostat to auto heat?

When in Auto Change Over mode, the display will indicate "auto heat" or "auto cool" to the left of the current room temperature. 

If you want to adjust the heat setting when the display reads "auto heat," or the cool setting when the display says "auto cool," simply push the + or - button. 

If you want to alter the cool set point while it reads "auto heat," first click the mode button till it says "cool," then use the + or - to modify it. 

Then, click the mode button to return to Auto Changeover mode.

Why will a blower run on the on position and not on auto?
  • No heat: The furnace's heat source is completely inoperable - no fuel, no electricity, off on safety reset - the burner never fires up.

  • A faulty temperature sensor or a faulty limit control switch: The furnace's heat source is operational, but the fan limit control or temperature sensor that activates the fan is damaged, has a loose wire, or is faulty electrically.

  • Bad control board: The furnace control board, which operates the blower component, is broken or malfunctioning.

  • Bad thermostat: There is a remote potential that there is an issue with the thermostat itself.


Now, you can simply resolve the problem by following our simple solutions.

If you run into trouble when fixing Honeywell Thermostat heat not working on auto, it is always a good idea to contact Honeywell and have this matter revealed with the help of a specializer.

Rating:5.0 - 52Votes
Related Posts
All post


  1. user_avatar

    Stephanie Shaw

    Excellent work 🙂

    Leave a Comment

    Your email address will not be published. Required fields are marked *
    Submit Comment
    1. logo



      Leave a Comment

      Your email address will not be published. Required fields are marked *
      Submit Comment
  2. user_avatar

    Sandra Hughes

    Should I Set my HVAC System's Fan Setting to Auto or On?

    Leave a Comment

    Your email address will not be published. Required fields are marked *
    Submit Comment
    1. logo


      Auto means that the fan turns on automatically only when your system is heating or cooling air. Once the thermostat reaches the desired temperature, the entire system shits off until the next cycle.
      On means that the fan is constantly on and blowing air when your HVAC system is not heating or cooling air

      Leave a Comment

      Your email address will not be published. Required fields are marked *
      Submit Comment
  3. user_avatar

    Rebecca Clarke

    Should my Honeywell thermostat be on auto for heat?

    Leave a Comment

    Your email address will not be published. Required fields are marked *
    Submit Comment
    1. logo


      The major advantage of setting the thermostat to "Auto" is that it will result in more energy efficient usage. It's because the fan will run only when it's required

      Leave a Comment

      Your email address will not be published. Required fields are marked *
      Submit Comment

Leave a Comment

Your email address will not be published. Required fields are marked *
Submit Comment