Things to Do When Honeywell Thermostat Not Working After Battery Change

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You have just replaced the batteries in your Honeywell thermostat and expect it to power right on. But alas, when you start it, you don’t see any reaction. Could it be the batteries? Could it be the thermostat itself?

Several things will make the thermostat not work even after replacing the older batteries. Let’s see what to do when you see your Honeywell thermostat not working after battery change.

Why Would Your Honeywell Thermostat Not Working after Battery Change?

When a Honeywell Thermostat isn’t working after the battery is replaced, there are a few things that can be checked. First, if the power is still coming to the thermostat, then it may be the wire to the thermostat that needs to be checked. If this is not the case, then it may be that there is an issue with the power supply to the thermostat itself. If all of these tests come back negative and the clock still works, then it may be necessary to replace the circuit board in the thermostat.

There are three significant reasons your thermostat isn’t working even after changing the batteries.

  • You Replaced the Old Batteries with the Wrong batteriesHoneywell thermostat battery replacement if thermostat doesn't work AC won't turn on

The most common reason a Honeywell thermostat wouldn’t work after a change of batteries is to replace the old batteries with the wrong ones. Granted, you don’t need to change the batteries that often.

But when you do, it should be with suitable batteries. Thermostats like battery-powered radios also need the right batteries to work. Therefore, using the wrong ones to hope they’ll work doesn’t crack it.

But that isn’t the only reason the thermostats will refuse to work after you change the batteries. It might be a significant reason, but it isn’t the only one. So, what are the other reasons?

  • Incorrect battery installationThermostat Installation

Yes, incorrectly installing the batteries will make the thermostat not work. This might have you wondering, who can’t replace thermostat batteries the right way? But it will interest you to know that sometimes you can make mistakes reinstalling the batteries by placing them on different polarity sides.

For context, here is the correct way to install thermostat batteries:

  • Gently press the side of the thermostat to retrieve the battery compartment
  • Remove the depleted batteries and replace them with the new ones
  • Pay attention to the positive and negative terminals
  • Reinsert the battery compartment and turn on the thermostat

Most people make mistakes when installing the batteries by placing the battery in the correct terminal. If you have the positive terminal on the wrong side, the thermostat won’t work even after changing the batteries.

Although relatively straightforward, mistakes are common in the alignment of batteries. If you notice an error in the alignment of the batteries, a simple realignment should help start the thermostat working.

  • Separate Replacement of the BatteriesSeparate Replacement of the Batteries

Sometimes you might want only to replace one of the pair of batteries that run your thermostat. Well, that will make the thermostat not work. Replacing all the batteries in one go will ensure there isn’t a potential difference between the two allowing them to work in unison.

While this isn’t a common error by people, it does happen. That might be down to some confusion with the batteries, especially if they are similar in color and shape to the old Batteries. 

  • Get A New Pair of BatteriesReplace the Batteries in Your Home's Thermostat With This Step-by-Step Guide

If, after checking the installation and the polarity alignments and they are okay, then maybe it’s the new batteries that aren’t new enough. Get a new pair, install them in the thermostat, and see if they work.

It is always wise to go for the same battery as what originally came with the thermostat when you bought it. 

Read Also: What Does a Thermostat Do If It Gets Too Cold – 5 Things You Can Learn From Experts

What If the Thermostat Still Doesn’t Work Even with Correct Battery Installation?Thermostat Not Working

If you notice that your thermostat still isn’t working even though you have installed the batteries correctly, that might point to a deeper issue.

To be sure the thermostat doesn’t have any significant issues, reset it. Here is how to do that:

    • Turn off the thermostat
    • Remove the batteries by sliding them out of their battery compartment
    • Restore the batteries in their holders but the reverse polarity (Positive terminals at the negative and vice versa)
    • Wait for about ten seconds
    • Now correct the battery alignment in the correct polarities 
    • The thermostat should now start

Resetting the thermostat will delete any information you had on the thermostat, including room and maximum temperatures. That isn’t too much of a problem since you can easily set the data again.

A factory reset should help make the thermostat work again if it isn’t the batteries that were the problem.

If you think the factory reset method is too strenuous, a simpler alternative is to use the thermostat’s menu. Here’s how to do it using the menu:

  • Turn the thermostat on
  • Long press the menu button. This brings up a list of options.
  • From the left menu, choose ‘reset’ and answer the prompt with a yes

The above actions will reset the thermostat. This method works for most Honeywell models.

What If Everything Fails?

If the thermostat has far more underlying issues, it won’t work even after changing the batteries. Resetting won’t also help solve the problem. With such a thermostat, you might notice the screen remaining blank even after you have replaced the batteries.

If all the troubleshooting steps fail, contact Honeywell Support. If the thermostat still has its warranty, it will help get Honeywell themselves to help solve the issue.

Alternatively, you can also contact a specialist to come and help you fix it. Fixing a thermostat needs special tools that might not be available in a home setting.

That’s why contacting a specialist to help you should be the logical step. You might have to replace the thermostat and get a new one on the specialist’s advice. That’s if all they try doesn’t work.

That will only mean one thing: that the thermostat has irreparable damage. Of course, keep the issue in mind when going for the new Honeywell thermostat. Always remember to choose the latest model of your desired Honeywell thermostat.

Later models have lesser issues than older models because of improvements in their construction.

FAQs About Honeywell Thermostat Troubleshooting

Do I need to reset my Honeywell thermostat after changing batteries?

The Honeywell thermostat should be reset after changing batteries. This will ensure that the thermostat is functioning properly and that the settings are updated.

Why won’t My Honeywell thermostat turn on after changing batteries?

The most likely reason your Honeywell thermostat is not turning on after changing batteries is that the batteries are not installed correctly. The battery terminals may be dirty or corroded, which can prevent a good connection and keep the thermostat from powering on. If the batteries are installed correctly and the thermostat still does not turn on, there may be a problem with the thermostat’s wiring or circuitry.

How do I fix an unresponsive Honeywell thermostat?

If your Honeywell thermostat is unresponsive, you may need to reset it. To do this, remove the battery for at least 30 seconds, then replace it and try turning it back on. If it still doesn’t work, you may need to call a technician.

Where is the reset button on the Honeywell thermostat?

The reset button for a Honeywell thermostat is located on the bottom of the unit. It is a small, circular button that can be pushed with a finger. The reset button restores the thermostat to its original factory settings and clears any programming that may have been entered into the device.

Will a Honeywell thermostat work without a battery?

A Honeywell thermostat will work without a battery as long as it is plugged into an electrical outlet. The thermostat will use power from the outlet to run its internal clock and other functions.

Why would the thermostat stop working?

One reason a thermostat may stop working is that the batteries have died. If there is no longer a power source to the thermostat, it will not be able to function. Additionally, if the wiring in the home is old or damaged, it could prevent the thermostat from receiving power and thus stop it from working.

How do I know if my thermostat is broken?

If your thermostat is not working, it may be broken. There are a few ways to determine if your thermostat is not working properly. One way is to check to see if the fan is turning on. If the fan is not turning on, the thermostat may be broken. Another way to check to see if the thermostat is broken is to see if the furnace is turning on.

Final Thoughts

There you go. That’s all the things you need to do if you notice your Honeywell Thermostat not working after the battery change. If all the fixes don’t work, perhaps you need to change the thermostat.

However, don’t rush to change the thermostat if you haven’t received a professional opinion from a thermostat specialist.

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