Honeywell Thermostat Not Working After Battery Change

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Fix #: Shut The Furnace Door Well

Replace Batteries On A Honeywell Thermostat / Heat, AC Or Back Light Not Working?

If you do not close the access door well, the door switch on some thermostat furnaces will not work well. Hence, other systems will not perform as needed.

Also, since the switch is not depressed, a power supply will not be available on the thermostat.

So, you will need to confirm if you shut the mentioned door well and, if not, kindly correct it.

Replace All Battery At Same Time

Batteries should always be replaced in a thermostat at the same time, because there might be differences in charge levels between the old one and the new.

Differences in charge levels can make your thermostat show incorrect temperatures or fail to operate altogether.

You should ensure that the replacement batteries are in the same charge level. If not, your thermostat might have issues registering the correct temperature and you may experience weird results in your home.

The Thermostat Has Not Been Reset After Changing The Batteries

In many new electronic thermostats, a small battery on the thermostat is used to hold the thermostats settings in memory if the power fails or the batteries are changed. If this small battery is functioning there should not be a reset problem after the main batteries have been changed.

Unfortunately, this little battery is rarely checked and over time it might stop holding the memory. Thus, even relative new HVAC thermostats sometimes have to be reset manually after new batteries have been inserted. This should be the first thing to do when the AC is not working after a battery change.

Generally, it is a simple procedure to reset a non-programmable digital thermostat. Just take off the face of the thermostat and press the reset button for five seconds. If you cant find the reset button, take out the batteries again, wait five seconds, and put them back again.

If you have a programmable thermostat every brand and model have a different way of resetting. Follow the steps set out in the thermostats manual. If you dont have a manual or cant find information online you can try to reset the thermostat by pushing the recessed reset button with a pin or paper clip. If you cant find the recessed button, shut off the circuit breaker to the thermostat and put it on again after 30 seconds.

If the resetting has been successful the thermostat will start working and your HVAC system, including the AC, will start to work again.

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Honeywell Thermostats Basic Information

Before we delve into troubleshooting and fixing your thermostat, lets take a step back and review the basics of a thermostat. A thermostat is a device that controls the temperature the heating and air conditioning in your home. It is usually mounted on a wall, usually near an entryway or window.

Thermostats come with different types of batteries, depending on the thermostat model, such as AA or AAA. Some thermostats are even considered smart thermostats, and they are hardwired directly into your home. You will want to check your thermostats user manual to determine what type of thermostat you have and how it works.

As far as Honeywell thermostats go, they come in many different models and sizes, but most have some features in common:

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How To Change Thermostat Battery Honeywell : Honeywell Thermostat Not ...

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Honeywell Thermostat Buttons Not Working

Your thermostat will use buttons as control if it doesnt have a touchscreen, and, likely, the buttons may not respond at times.

If your Honeywell thermostat buttons are not working, the buttons may have been tampered with by kids around, and the keypad has been locked. The manual contains instructions you can follow to unlock your button pad.

Additionally, cleaning the inside of the thermostat may be what you have to do because of the non-functionality of your buttons, maybe because of the dirt inside the thermostat. If youve tried this option too and the button isnt responding yet, then you might want to consider replacing the button.

Factory Reset The Thermostat

Factory resetting is a great way for you to fix any persistent problem with your thermostat.

Be warned, though, following through with a Factory reset will take your thermostat back to the default factory settings.

I will give you a general guide on the steps needed to be taken to factory reset any Honeywell thermostat. Later on, I will talk you through each specific model.

To reset your thermostat, follow these steps:

  • Ensure that your thermostat is turned off
  • Open the door of the battery compartment. Insert a coin or something similar into the slot or by pushing it in and then sliding out the compartment door
  • Now take out the batteries
  • Put the batteries back on in reverse to the indicated polarity by the markings in the battery holder
  • Allow the batteries to stay this way for about five seconds
  • Next, take out the batteries and reinsert them in the correct alignment
  • The display may now light up, which means it has become working once again
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    Check If You Are Using The Right Battery

    Check If You Are Using the Right Battery

    If your Honeywell thermostat still does not work, you may be using the wrong batteries. The fresh batteries in your thermostat may not be enough to keep it running.

    Go inside the battery compartment to determine which boost converter your batteries require. For example, 1.5V AA batteries primarily power them. Batteries should be non-rechargeable.

    While getting the necessary batteries, make sure they are of good quality. Poorly made batteries can cause the same concern. Instead, check that the batteries are active and buy high-quality batteries.

    Use Correct Type Of Batteries

    Honeywell thermostat battery replacement if thermostat doesn’t work AC won’t turn on

    If youve tried replacing your batteries in the Honeywell thermostat but are still having issues with the unit, try fresh batteries. Also, check to see if you have the correct type of batteries make sure theyre recommended batteries. Putting in incorrect batteries is a common reason why this device doesnt work properly after a battery change.

    There are multiple factors that you should consider when choosing the right batteries for your thermostat. A simple way to do this is to check the inside of the battery compartment. Most batteries require a 1.5v AA alkaline battery.

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    Fix Honeywell Thermostat Heat Not Working After Battery Change

    Reviewed By Leticia Haupt Latest Updated December 10, 2022

    The problem of the Honeywell thermostats not working after battery change is frequent and very common. If you facing the same. We got this guide for you. This will talk about possible issues that can cause hindrances in Honeywell Thermostats.

    Fix : Check If The Batteries Were Installed Correctly

    While it may sound obvious to many users, it is still possible that you did not put the new batteries in right.

    For this reason, our first suggestion is you go back to the battery compartment a second time and confirm that you installed them in the required orientation.

    If not, rectify the placement to ensure the correct orientation.

    Quick Tip: In most cases, batteries in programmable Honeywell thermostats should be aligning in the same direction, facing up .

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    Factory Reset Your Thermostat:

    Honeywell Thermostat Not Working After Battery Change (2022)

    Try every troubleshooting tip to fix the Honeywell thermostat that wont work after a battery change. Still, if the Honeywell thermostat doesnt turn on, factory reset your thermostat. This will set your thermostat to its default settings and remove all custom settings. Then you will set all settings from scratch.

    This will turn on the display, wait a few seconds and see how you fixed your thermostat. Honeywell Thermostat replace battery reset is a great way to fix any bug in your device.

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    Clean The Terminals Of The Battery:

    You may have used your old batteries for a little too long which leaves dirt on terminals, and not letting the new terminals perform well. The clogged dirt between terminals can be one of the reasons Honeywell Thermostat wont work after a battery change.

    Clean the terminals thoroughly for any dust using a soft brush and then insert new batteries into them. Hopefully, your thermostat will take some time and then start operating perfectly. Cleaning the dirty terminals boost the battery performance.

    Series 2000 & 1000 Honeywell Thermostat Battery Replacement

    The 2000 and 1000 series are budget Thermostats from Honeywell. Mostly these thermostats are used in big complexes and apartments.

    The thermostats have LED display and can be used with air conditioner and gas furnace.

    Overall, if you are on budget and dont want to compromise on the quality, you can go for the above models.

    • Like all other models, this model also needs to be switched Off first.
    • Now, take out the cover plate from the base plate. You have to pull it from the bottom of the plate.
    • Replace the batteries. It contains 2 AA batteries. Make sure to check the polarity of the battery .
    • Put the cover back to the base plate.
    • Now, Switch on the Thermostat.

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    Summing Up Your Thermostat Issue

    When you try to replace the batteries in your thermostat but your thermostat does not work, the first place you look is the batteries themselves. First make sure you have installed the battery or batteries correctly. Next, ensure you have purchased the exactly correct type of battery for your thermostat.

    If this is not the issue, try to reset the thermostat, and then check the thermostat itself. If nothing seems to work, it may be time to upgrade to a new and improved thermostat.

    Dennis is a retired firefighter with an extensive background in construction, home improvement, and remodeling. He worked in the trades part-time while serving as an active firefighter. On his retirement, he started a remodeling and home repair business, which he ran for several years.

    Reboot Your Thermostat Via The Circuit Breaker

    How to replace the AA batteries in a Honeywell Thermostat

    If your Honeywell thermostat wont turn on after replacing the batteries, another fix to try is rebooting the device via your circuit breaker.

    Follow the steps below to reboot/reset your Honeywell thermostat via the circuit breaker:

    • Go to your circuit breaker panelit is the main power distribution panel in your home.
    • Locate the thermostat circuit breakerit is usually labeled A/C, Air Conditioner, or HVAC.
    • Flip the circuit breaker off. Then wait for a few seconds and flip it back to the ON position.

    Check your thermostat to see if the display is back on. If not, continue to the next step.

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    How To Switch The Batteries In Your Honeywell Thermostat

    Now that weve covered the basics, lets talk about the overall process of replacing batteries in a thermostat.

  • Turn off the power to your thermostat and remove it from the wall. Turning your unit off can be accomplished via a switch that says ON/OFF. Then you can slowly pull it off the wall plate by sliding it up and off its tracks. If you arent sure how to switch off the unit, refer to your owners manual to find out.
  • Locate the battery compartment on your model and open it. Most Honeywell models will have their battery compartment close to the bottom of the machine.
  • Open the battery compartment and source some new batteries. If you dont know what type of batteries you have, take a look inside the battery compartment. Get the same type of batteries that your thermostat currently housed.
  • Remove the old batteries and replace them with new ones. This is pretty straightforward. Just make sure that your batteries fit in the compartment correctly and that you match the polarity of the batteries per the thermostats instructions. If you ever replaced the batteries in your TV remote, its the same type of deal.
  • Close the battery compartment. Make sure you hear the compartment click into place.
  • What Type Of Batteries Do Honeywell Thermostats Use

    If your Honeywell thermostat requires batteries, its normal to feel worried about finding the right battery size for your thermostat. Thankfully, Honeywell decided to make things easy by requiring fairly commonplace batteries. Most of their models will require either AA or AAA batteries.

    To find out how many and the specific size you need to buy, open up the battery compartment in your thermostat and take a look at the battery layout. If you dont care to take note, just bring some AA and AAA batteries to the site of your replacement work. This way, youll have both battery types available.

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    Do All Honeywell Thermostats Require Battery Replacement

    Though most thermostats do require batteries to function, not all of Honeywells models will. If you cannot locate a battery compartment, if you plug your thermostat directly into the wall, or never receive LOW BATTERY alerts, then you probably have a model that doesnt require batteries.

    To make sure, look for a C-wire leading from the thermostat. If you dont have a C-wire, then your thermostat probably will need to get batteries replaced.

    Time For A New Thermostat

    How To Change Battery In Honeywell Thermostat Th5110D1006 : How To ...

    If there is power to the thermostat and it still doesnt work after a reset, you may have a bad thermostat. While not common, this can happen. Fortunately, new electronic thermostats for most HVAC systems are moderately priced. A quick trip to the home improvement store will soon have your HVAC up and running again.

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    Aspect : Did You Buy The Best Batteries Available

    Sometimes batteries even new batteries are just not strong enough to allow your Honeywell thermostat to work. Some cheap batteries are often not meant to be used in sophisticated environments and devices. They are not strong enough for a device such as your Honeywell thermostat.

    More expensive batteries are usually designed for high-tech devices and have a guaranteed power capacity. More expensive batteries will also work longer. Good thermostat batteries can be in service for up to 2 years. Therefore it is good practice to buy the best batteries available even if they are more expensive.

    So, when your thermostat is not working after youve replaced the batteries and you know you havent bought the best batteries available, your problem can probably be solved by purchasing and inserting a better set of batteries.

    Fix : Reset Honeywell Thermostat After Replacing Batteries

    Another troubleshooting procedure that may work is resetting the thermostat- resetting takes it back to its default factory settings and may help it clear the fault that is making it not to work.

    Here is how to perform a Honeywell thermostat reset:

  • Make sure the thermostat switch has been set to Off.
  • Push the battery door open by inserting a coin into the slot found on the door. Before this, you could attempt to see if the battery door will open by pressing it down then sliding out.
  • Next, proceed to remove the batteries.
  • Now re-insert the batteries but you place them backward in this instance. To be clear, the idea is to have the pole line up with the + terminal.
  • Let the batteries stay in this backward orientation for five or so seconds.
  • You then take the batteries out once more.
  • Next, re-install the batteries in the appropriate orientation. After a brief pause, your thermostat may display information meaning its now set for use.
  • Replace your battery compartment lid- simply slide it back firmly.
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