Overview of How to Replace Battery in Honeywell Thermostat
Honeywell thermostats use AA or AAA batteries (two or three depending on model) or sometimes no batteries if hardwired. Replace yearly or when Low Batt appears (about 60 days warning). Battery access varies by series: many slide or remove the cover plate; 1000–4000 series use batteries under the cover, 5000–6000 use a battery compartment, 8000 and Lyric Round use AAA. To replace: power off, remove cover/compartment, swap batteries with correct polarity, reattach, and restore power. If it won’t power on, check cover seating, battery orientation, battery health, or perform a breaker reset.
-
How often should I replace the battery in my Honeywell thermostat?
Replace the battery once a year; the thermostat displays Low Batt about 60 days before battery expiration. -
Can I use any AA or AAA battery for my Honeywell thermostat?
Yes; the article states common AA or AAA batteries of the correct size can be used as replacements depending on the model. -
What is the best way to change batteries in Series 5000 and 6000 Honeywell thermostats?
Turn off the thermostat, press and pull to remove or slide out the battery compartment from the top right (Series 5000) or bottom (Series 6000), replace AA batteries checking polarity, then reattach and turn on. -
How do I restore my Honeywell thermostat if it does not turn on after replacing batteries?
Check that the faceplate or battery tray is seated properly, verify correct battery polarity and battery health, and if needed perform a hard reset by switching off the circuit breaker. -
Do all Honeywell thermostats require batteries?
No; some non-programmable Honeywell thermostats are powered by the primary electrical supply and do not require batteries.
Honeywell Thermostat has been my favorite for years, not just because of its lengthy 100-year history, but also because of the variety of thermostats it has provided throughout the years. From the Series 1000 to modern smart Wi-Fi-equipped thermostats, you may find everything you need within your price range. However, because of its numerous variants, we are frequently perplexed about the proper approach for changing batteries, since the process varies depending on the model.
So, how do I change the battery in my Honeywell thermostat? In general, you may change the Honeywell thermostat’s batteries by simply taking out the cover plate or sliding out the battery compartment. Replace the battery and return it to its original position.
What Honeywell Thermostat Battery Type Is?
This type of thermostat system will require AA or AAA batteries, depending on the thermostat model. Some devices will use the thermostat’s main power source, whereas those that require batteries will use two or three common batteries. Any similar size battery can be used as a replacement.
| Honeywell Thermostat | Battery Type | Number of Batteries | Battery Location |
| 1000 Series | AAA | 2 | Under the cover plate |
| 2000 Series | AAA | 2 | Under the cover plate |
| 3000 Series | AA | 2 | Under the cover plate |
| 4000 Series | AA | 2 | Under the cover plate |
| 5000 Series | AA | 2 | Battery compartment |
| 6000 Series | AA | 2 | Battery compartment |
| 8000 Series | AAA | 3 | Under the cover plate |
When should the Honeywell Thermostat battery be replaced?
A Honeywell thermostat’s battery should be replaced once a year, and you will receive a warning 60 days before the battery expires. As a result, you have ample time to change the batteries, but there is a catch!
The thermostat features an LED panel that displays Low Batt or Replace the battery. This is the first notification you receive, which is likely 60 days before your battery dies. However, another warning is the black screen, which causes your thermostat to cease operating.
You may have a thermostat that merely utilizes a battery as a backup, and you may not be concerned about updating the thermostat’s batteries.
But believe me, even if your thermostat uses a battery for the backup process but you still need to replace the battery as this might cause certain changes in the Time and Date settings of the Honeywell thermostat.
This is How to Replace Battery in Honeywell Thermostat to almost all thermostat models with few exceptions.
To change the batteries on a Honeywell thermostat:
- Turn the power off at the circuit breakers
- Remove the battery compartment from the baseplate
- Remove the old batteries
- Replace the batteries
- Replace the battery compartment with the baseplate
- Turn the power on at the circuit breakers
Note: This is how Honeywell Thermostat Battery Replacement works for many devices.
Here is the list of How to Replace Battery in Honeywell Thermostat (Series)
Series 2000 & 1000 Honeywell Thermostat Battery Replacement
Models TH1100DV, TH1110DV, TH1210DV, TH2110DV & TH2210DV
- Turn the Thermostat Off.
- 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 on the base plate.
- Now, Switch on the Thermostat
Series 3000 Honeywell Thermostat Replacement of Battery
Models TH3110D & TH3210D
- Turn the Thermostat Off.
- Now, push and pull the thermostat cover from the bottom.
- Once the cover plate is separated from the base plate, replace the batteries.
- Put the cover back to the base place by sliding it gently until it gets fixed firmly.
- Turn On the Thermostat.
Series 4000 Honeywell Thermostat Replacement of Battery
Models TH4210D & TH4110D
- Switch off the Thermostat from the main circuit breaker so that you are not exposed to any live wire.
- Remove the Cover plate. Push it from the bottom.
- Now, change the batteries (AA) with fresh ones.
- Put the cover plate back in the base place. Place it firmly.
- Now that the batteries are replaced you can turn on the Thermostat.
Series 5000 Honeywell Thermostat Replacement of Battery
Models TH5110D, TH5220D & TH5320U
- Turn off the Thermostat.
- Just press and pull the cover to take out the battery compartment from the top right corner.
- Take out the battery compartment and Replace the battery (AA).
- Now, place the top cover as it was before.
- You have replaced the battery, it’s time to switch on the Thermostat.
Series 6000 Honeywell Thermostat Replacement of Battery
Models TH6110D, TH6220D & TH6320U
- Switch off the Thermostat from the circuit breaker.
- Press and pull the cover from the bottom to remove the battery holder.
- Slide out the battery compartment and replace it with AA batteries.
- Now, put the cover as it was fixed to the base plate earlier.
- Make sure to check the polarity of the battery before placing the battery compartment.
Series 8000 Honeywell Thermostat Replacement of Battery
Models TH8110U, TH8320U & TH8321U
- The first step for battery replacement of all the thermostats is to switch it off.
- Once, you switch off the Thermostat, open the front cover by holding the base in place and pulling out the front cover gently.
- Replace the batteries (3) with new AAA batteries and make sure to check the + and – polarity of the battery.
- Now, put the cover back and place it as it was attached to the base plate.
- The battery replacement is done and now you can switch on the Thermostat.
Honeywell Thermostat – Lyric Round
- Make sure to Switch Off the Thermostat and take out the thermostat from the sub-base.
- Replace the old batteries with fresh new AAA batteries.
- Now, place the faceplate back to the sub-base.
- Turn On the Thermostat.
