Honeywell Thermostat heat not working on auto? Causes and solutions

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 and how to effectively fix it.

So, check it out!

Fix Honeywell Thermostat heat 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 house thermostat heat not working on auto, 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.

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.

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Outdated firmware and damaged data or files may conflict with your thermostat's auto choices.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

Concerned that your Honeywell T5 Thermostat heat not working on auto?

Don’t worry! 

We'll walk you through some troubleshooting steps that could assist you in fixing a Honeywell Thermostat 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 house thermostat heat not working on auto, you almost 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, your thermostat will not heat, giving the appearance 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?