
To change the batteries in your thermostat, start by turning off the power to the thermostat at the breaker box. Then, remove the thermostat’s faceplate to access the batteries. Once the old batteries are out, insert new batteries in the same orientation and reattach the faceplate.
How do I change the batteries in my Pro1 thermostat?
All Pro1 thermostats use 2 AA batteries. We recommend Duracell® or Energizer® brand batteries for the best performance. How do I change my batteries? Open the door on the front of the thermostat. Replace with 2 high quality AA Batteries (Duracell or Energizer).
How do I change the battery in my Trane thermostat?
To change the battery on your Trane thermostat, first remove the thermostat from the wall by grabbing it from the top and bottom. Once the thermostat is off the wall, you will see the batteries. Carefully reach in and remove the old batteries, being careful not to lose any of the small pieces.
How do I get the batteries out of my thermostat?
If you don’t see batteries behind the door on the front, pull the thermostat off its sub-base with a firm tug to access the batteries at the back of the thermostat. What does it mean when “FILT” appears on my thermostat display?
How do I change the battery in my Nest Thermostat?
Pull the thermostat display off the base. Remove the old batteries from the back of the thermostat display. Insert the two new AAA alkaline batteries. Push the thermostat display back onto the base until it clicks into place. Note: You cannot replace the batteries for the Nest Thermostat E or Nest Learning Thermostat.

How do I change the battery in my Honeywell Pro thermostat?
0:001:28Replace Home Thermostat Battery-Honeywell T4 Pro ...YouTubeStart of suggested clipEnd of suggested clipYou just grab it hang on to it and just gently rock it back and forth and pull it pops out and hereMoreYou just grab it hang on to it and just gently rock it back and forth and pull it pops out and here you can see the two batteries.
How do I open my Honeywell Pro Series thermostat?
0:172:21Honeywell Pro Series Thermostat Battery Replacement (BATT)YouTubeStart of suggested clipEnd of suggested clipOff the wall. And to do this you just want to gently pull the thermostat. Straight away from theMoreOff the wall. And to do this you just want to gently pull the thermostat. Straight away from the wall. Like so and you want to be gentle because on the back side of the thermostat.
How do you take the cover off a Honeywell Pro Series thermostat?
Removing the Honeywell T4 Pro thermostat is simple: just pull it from the wall. Pull gently, and wiggle it a bit if necessary. It should pop off easily.
Do Honeywell Pro Series thermostats have batteries?
Batteries are not required if the Honeywell T6 Pro Z-Wave Programmable Thermostat was wired to run on 24 VAC power when installed. To provide optional backup power, install three fresh AA alkaline batteries immediately when the low battery alert appears.
How do I remove a thermostat cover?
0:011:12How to remove your old thermostat from the base - YouTubeYouTubeStart of suggested clipEnd of suggested clipMost thermostats can be removed from their base by gently pulling them from the wall.MoreMost thermostats can be removed from their base by gently pulling them from the wall.
Why is my Honeywell Pro Series thermostat not working?
Troubleshooting a Programmable Honeywell Thermostat Put in new batteries; Check the circuit breaker; Check the indoor unit to make sure all the panel doors are closed; Make sure the power is connected to the furnace or air conditioning unit by checking the switch near the indoor unit is up.
Why has my Honeywell thermostat gone blank?
If you own a Honeywell thermostat, the blank screen could be an indication of a furnace door that wasn't completely closed. These thermostats are programmed to shut off entirely if a furnace door is open. To rule this out, double-check to make sure your furnace door is fully closed.
Where are the batteries in a Honeywell thermostat?
The battery compartment on a Honeywell thermostat is located on the side of the device. To remove it, first push the tab on the top of the thermostat. Then pull it to remove the compartment — it should slide right out.
What happens when thermostat runs out of battery?
When low batteries eventually die, you'll see a black display screen, the thermostat will stop working and your heating or cooling units won't function. The heating and cooling system cannot respond to nonexistent temperature commands.
Will a Honeywell thermostat work without a battery?
1:192:34Does My Thermostat Need Batteries? - YouTubeYouTubeStart of suggested clipEnd of suggested clipOn your thermostat and the C terminal down in your equipment or up in your equipment wherever yourMoreOn your thermostat and the C terminal down in your equipment or up in your equipment wherever your equipment may be and you will not need to use batteries at all in your thermostat.
How do you unlock a Honeywell T6 Pro Series thermostat?
0:573:00How to Unlock the Honeywell T6 Pro Thermostat? - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo how you unlock it is simply push the button right below where it says unlock.MoreSo how you unlock it is simply push the button right below where it says unlock.
How do I reset my Honeywell Proseries thermostat?
To reset the Honeywell T5+ / T5 / T6 Pro Series Thermostats to factory default settings, you should follow these steps:Check whether the device is on (it should be on).Press the menu button and hold it for 5 seconds.Now scroll to the left and stop when you see 'Reset'.Click 'Select' on Factory.More items...•
How do I unlock my Honeywell thermostat th8321wf1001?
0:172:19Lock or Unlock the VisionPro 8000 - YouTubeYouTubeStart of suggested clipEnd of suggested clipNow we go to menu. And we scroll down to security settings. Okay change lock mode. Right now it'sMoreNow we go to menu. And we scroll down to security settings. Okay change lock mode. Right now it's unlocked scroll down till you hit fully lock.
How do I unlock my Honeywell thermostat TH4110U2005?
How do I lock/unlock the screen TH4210U2002, TH4110U2005 thermostat?Press Menu on the thermostat.Press + or - to go to LOCK. ... Press + or - to go to OFF, PART, or ON, and then press Select.To unlock the keypad, press the CENTER button and then enter the password “1234”. ... This will unlock the keypad.More items...•
What to do if battery is low?
If the low battery message doesn’t go away, replace the batteries with high-quality 1.5 V AAA alkaline batteries from a known manufacturer.
Can you replace batteries in a Nest thermostat?
Note: You cannot replace the batteries for the Nest Thermostat E or Nest Learning Thermostat. Instead, charge the thermostat with a USB cable.
Does Nest thermostat use batteries?
The Nest Thermostat receives power from your HVAC system. It also uses 2 AAA alkaline batteries as a backup, or to supplement if your system can’t deliver enough power. This article only applies to the Nest Thermostat. How to tell which thermostat you have.
Where are the Batteries In a Honeywell Thermostat?
Honeywell produces many thermostat systems, many of which require batteries for the control panel to operate.
How Do You Reset a Low Battery On a Honeywell Thermostat?
If the indicator does not disappear automatically, the system may require a restart to reset the indicator. Advanced models can be reset by following instructions in the display menu.
How Do I Get My Honeywell Thermostat to Work After Changing the Battery?
Suppose the thermostat is not working after replacing the batteries . In that case, the batteries are in the wrong orientation, the faceplate may be incorrectly seated, the batteries may be faulty, or the system may require a reset.
Will a Honeywell Thermostat Work Without Batteries?
Honeywell manufactures a wide variety of thermostat systems. Many of these systems are programable, but some are not. Non-programmable systems do not have control panels, and therefore do not require batteries. Programmable systems do require batteries to function correctly.
Do All Honeywell Thermostats Require Batteries?
Not all Honeywell thermostats use batteries. Several non-programmable Honeywell thermostats do not require batteries to power the control unit. These units are wired into the main electrical power source for the thermostat, as they draw such little power. These units have no screens or other power-using features.
How Do I Know If My Thermostat Needs a New Battery?
All Honeywell thermostats that use batteries will have an indicator on the control panel. If the system has a screen, a warning such as “Low Batt” indicates that you must replace the batteries soon. Some models do not have an indicator but will instead flash the snowflake icon.
Why is my thermostat not working?
Suppose the thermostat is not working after replacing the batteries . In that case, the batteries are in the wrong orientation, the faceplate may be incorrectly seated, the batteries may be faulty, or the system may require a reset.
Why is the Pro1 thermostat built in?
One reason this feature is used is to help protect your system against short cycling. Your heating and cooling professional knows how to use these features to your best advantage.
What is Pro1 thermostat?
The Pro1 professional thermostat systems are designed to give you the best technology of today and the flexibility for easy upgrading in the future. Our innovative design always has the same footprint so you never have to worry about wall marks to repair if you upgrade to a new model. Your Heating and Air Conditioning technician can help you upgrade.
How to override a programmable thermostat?
Your thermostat will be in permanent override if you press the up or down temperature keys and then press the “hold” key. You will notice the word “hold” near your setpoint and now your thermostat will stay at your setpoint temperature until you press “run sched” or turn the system switch to “off”.
What is the minimum temperature between the heating and cooling setpoint?
When in auto-changeover (auto selected with the system key) mode there must be a minimum of a 3 degree dead-band between the heating and cooling setpoint. For example, if the heating setpoint for a given time period is 70 degrees then the cooling setpoint must be 73 degrees or higher.
How to reset a thermostat?
The thermostat can be reset by power cycling. Power cycle the thermostat by removing if from the subbase and remove the batteries (some thermostats will not have batteries). Wait 10 seconds and then replace the batteries and place the thermostat back on the subbase.
How to replace a thermostat with a AA battery?
Open the door on the front of the thermostat. Replace with 2 high quality AA Batteries (Duracell or Energizer). If you don’t see batteries behind the door on the front, pull the thermostat off its sub-base with a firm tug to access the batteries at the back of the thermostat.
What is the minimum dead band on a thermostat?
When in auto-changeover (auto selected with the system key) mode there must be a minimum of a 3 degree dead -band between the heating and cooling setpoint.
What does it mean when your thermostat light up when you turn it on?
If your thermostat had the batteries changed well, then you will see the thermostat light up when you turn it on. Shortly after, you’ll see the “LOW BATTERY” warning light shut off, indicating that the battery replacement was a success.
How to keep a thermostat going?
But how do you do that? Turn off your thermostat, open the battery compartment on the front, and remove the batteries. Put the new batteries in the compartment and slide the protective plate over them.
How long does a Honeywell thermostat last?
For the most part, Honeywell makes a fairly durable thermostat. You should expect to have your thermostat last at least 10 years. If you start noticing more problems and it’s older than 10 years, you might want to replace the thermostat rather than the batteries.
How long does it take for a thermostat to stop working?
If your thermostat’s low battery indicator has been on for 60 days and you still haven’t replaced it, it will eventually be entirely depleted of energy. This will lead to your thermostat ceasing to function until you replace the defunct batteries. Once your thermostat gets new batteries, it’ll be able to start up and recalibrate itself.
How to tell if you need to replace batteries in thermostat?
If you need to replace the batteries in your thermostat, you’ll find out because the thermostat will tell you. Usually, this will be in the form of a light saying “LOW BATTERY,” or “REPLACE BATTERY” on the side of your thermostat.
What to do if your thermostat is wonky?
Should you suspect this to be the case, call up Honeywell’s customer service line. They will usually be able to help you replace it with a functional model.
What to do if you don't have a C wire?
To make sure, look for a C-wire leading from the thermostat. If you don’t have a C-wire, then your thermostat probably will need to get batteries replaced.

Overview
Low battery warning during setup
Low battery warning after setup
- If there’s a power issue and the backup batteries get low, your Nest Thermostat will let you know with a low battery message in the Home app and on the display. You can easily replace the batteries with new ones. Follow the replacement directions in the last section.
Repeated low battery warnings
- If you repeatedly get low battery messages from your thermostat, or if there’s another power-rela…
1. Replace the batteries by following the directions in the section below so your thermostat can control your system (and you can stay comfortable) while you check the C wire.
How to replace the batteries
- Important: Use only high-quality 1.5 V AAA alkaline batteries from a known manufacturer.
1. Pull the thermostat display off the base. - 2. Remove the old batteries from the back of the thermostat display.
3. Insert the 2 new AAA alkaline batteries.