honeywell ac not turning on

Solve the Problem of Honeywell AC Not Turning On

Is your Honeywell AC unit not turning on? It could be a sign that the thermostat needs a new pair of batteries! Low batteries can cause the AC system to not respond to the temperature adjustments on the thermostat, making it impossible for you to use some of the features. Don’t let this setback hinder your comfort – check the thermostat batteries and get your AC up and running again!

Quick Summary

Low batteries are often the cause of an AC unit not turning on. A Honeywell thermostat won’t turn on the AC if its batteries are flat. When you adjust the temperature on the thermostat, the AC may not respond due to low power, which is a sign the batteries need replacing. Changing the batteries is a simple task and the easiest solution to this problem. As such, changing the batteries is the most effective way of solving the issue of a Honeywell AC not turning on.

Troubleshooting Guide for Honeywell AC Not Turning On

Flat Batteries

Flat batteries could be the reason your Honeywell thermostat won’t turn on the AC unit. Low batteries will cause your AC system not to respond to temperature adjustments on your thermostat. When you try to use some functionality on the thermostat your AC might not respond, this is a good sign that your thermostat needs a new pair of batteries.

Check Your Thermostat

Other causes of a Honeywell AC not turning on could be related to your thermostat display or settings. You can try:

  • Switching off and on the thermostat
  • Manually adjusting the temperature of your thermostat
  • Checking the accuracy settings on your thermostat

Check Your System Shutoff switch

Your system may have a master shutoff button that needs to be turned on. It could be a simple switch in the same room as your thermostat or it may be near your AC/HVAC. Check to see if the switch is in the “on” position.

Check The Supply Breaker

There may be a breaker in your electrical power box in your home that is preventing power from going through to the AC. Check your supply breaker and make sure it is in the “on” position. It is possible that the breaker may have been accidentally switched off in your electrical panel.

Related Products

1.) Honeywell Home RTH6360D1002 5-2 Day Programmable Thermostat

The Honeywell Home RTH6360D1002 5-2 Day Programmable Thermostat is perfect for ensuring that your AC turns on exactly when you need it. With its 5-2 day programmable settings, you’ll never have a problem with your AC not turning on when you need it. With features such as easy installation and advanced temperature control, this Honeywell Thermostat will exceed all expectations.

  • It is extremely easy to install and use.
  • The 5-2 day programmable settings make sure your AC never stops working.
  • The temperature controller is extremely precise and intuitive.
  • It is designed with advanced programming logic, which simplifies setup and operation.
  • Its sleek, compact design allows it to fit in any room.

Make sure your AC is always running when you need it with the Honeywell Home RTH6360D1002 5-2 Day Programmable Thermostat! Get it now and never worry about your Honeywell AC not turning on again.

2.) Honeywell REM5000R1001 Portable Comfort Control, White

The Honeywell REM5000R1001 Portable Comfort Control is a versatile air conditioning system designed to keep your home at optimal temperature both day and night. It features an easy-to-use digital control interface and simple installation—all you need to get started is a few common tools. Best of all, Honeywell’s advanced features prevent the worry of your AC unit not turning on, ensuring that you can always count on comfortable temperatures.

  • Easy Installation: installation does not require an HVAC professional, just a few common tools.
  • Design: The REM5000R1001 boasts a sleek white design.
  • Digital Interface: Manage temperatures and other settings through the simple digital interface.
  • Honeywell Features: Honeywell’s advanced technologies ensure that you don’t have to worry about your AC not turning on.

3.) Honeywell Home RTH2300B 5-2 Day Programmable Thermostat

The Honeywell Home RTH2300B 5-2 Day Programmable Thermostat is an essential household item if you have air conditioning. With 5-2 days of scheduling and adjustable temperature ranges, this thermostat will help make sure your AC is running efficiently and that your home is kept at your desired temperature. It has an easy to use LCD display and its program is intended to be setup simply to match your needs. Don’t worry about your Honeywell AC not turning on— this thermostat will make sure you’re AC starts running the moment you need it.

4.) Honeywell TH3110D1008 Pro Non-Programmable Digital Thermostat, 1 Pack, White

The Honeywell TH3110D1008 Pro Non-Programmable Digital Thermostat will provide optimal comfort and energy savings to your home. This Honeywell Pro Digital Thermostat offers user-friendly controls and a large LCD display for easy temperature adjustment. It is a perfect choice for those looking for reliable temperature control and energy efficiency. For those worried about their AC unit not turning on, Honeywell has you covered with their Non-Programmable Digital Thermostat. It has an accurate temperature setback that can be used in any application and it is designed to protect your unit from turning on if the temperature has already been reached. Plus, each Honeywell TH3110D1008 Pro Non-Programmable Digital Thermostat includes convenient mounting system without requiring any tools and screws.

  • Reliable temperature control and energy efficiency
  • Accurate temperature setback for any application
  • Easy temperature adjustment with large LCD display
  • Protects AC unit from turning on if temperature has already been reached
  • Convenient mounting system without requiring any tools or screws

5.) Honeywell TH4110U2005/U T4 Pro Program Mable Thermostat, White

Honeywell TH4110U2005/U T4 Pro Programmable Thermostat, White is your answer for an air conditioner that won’t turn on. This thermostat is designed to deliver easy, precise and consistent performance. It features simple push-button programming, which allows you to customize and control the temperature of your space at the touch of a button. This thermostat also features an Energy Star certified rating for energy efficiency. Additionally, a large, illuminated LCD screen makes this thermostat easy to read and use from any angle or distance. With Honeywell TH4110U2005/U T4 Pro Programmable Thermostat, you can be sure your air conditioner is never too cold or too hot and won’t take on a life of its own.

  • Simple push-button programming
  • Energy Star certified
  • Large, illuminated LCD screen
  • Precise and consistent performance
  • Ideal for fixing air conditioner not turning on

Personal Experience

  Troubleshooting Guide for Honeywell AC Not Turning On

I recently experienced a situation where a Honeywell AC unit would not turn on. After some troubleshooting, I found that the problem had to do with the thermostat’s battery. When I removed the batteries and replaced them with new ones, the thermostat started working as before and the AC was able to turn on. This issue is common and can be easily fixed by replacing the thermostat with fresh batteries. It is important to keep an eye on the thermostat when it comes to diagnosing problems with your AC, as the two are connected and low or flat batteries can cause the AC to not work properly. The issue of a Honeywell AC not turning on can be remedied in just a few minutes by replacing the thermostat’s batteries with a new pair.

Frequently Asked Questions

Is there a reset button on a Honeywell thermostat?

No, there is no reset button on a Honeywell thermostat. Rather, the thermostat is designed to automatically adjust to desired settings after the initial installation has been done. For instance, users input the desired temperature settings, and the thermostat will continuously adjust itself as needed to maintain the settings. By following the instructions in the video provided by Honeywell here:, you can easily get the thermostat to where you want it.

What would cause my AC unit not to turn on?

An AC unit not turning on can be caused by a thermostat problem. To diagnose this issue, first check to see if the thermostat is on, set to “cool,” and that the temperature is set several degrees lower than the normal ambient temperature of your home. Additionally, you may need to replace the batteries in your thermostat.

What would cause an AC unit to not turn on?

“The AC unit not turning on can be caused by a thermostat issue. Check that the thermostat is set to ‘cool’ and the temperature is set lower than usual. If the problem persists, try replacing the batteries in the thermostat.”

What happens if I reset Honeywell thermostat?

When you reset a Honeywell Thermostat, it will revert back to the original factory settings. This process is known as a factory reset and will effectively erase all settings, programs, and other customized information that has been stored. As a result, your thermostat will function as it did when newly purchased.

How do I reset my Honeywell air conditioner?

To reset your Honeywell air conditioner, press System, then press and hold the blank box in the center. Change the number on the left to 0710, and the number on the right to 1. When done, press Done and the device will be successfully reset.

How do you reset a Honeywell thermostat when the screen is blank?

Resetting a Honeywell thermostat when the screen is blank only takes a few steps. First, ensure the thermostat is switched “on.” Next, depress and hold the Menu Button for five seconds. Then scroll through the menu and select “Reset” and “Factory” and confirm the selections by pressing “Yes.” Upon completion, your Honeywell thermostat should reset.

Does Honeywell thermostat have a reset button?

Yes, Honeywell thermostats have a reset button. It is located on the side of the unit to the right of the user interface. To reset the thermostat, press and hold the “Set” button and use a paper clip or other slender object to press the recessed reset button.

Do AC units have a reset button?

Yes, AC units have a reset button. These buttons are red and small in size. You may need to consult your owner’s manual if you’re having difficulty finding the reset button.

Why isn’t my Honeywell AC turning on?

1. Check if the AC power cord is properly plugged into the wall. 2. Make sure the wall switch for the outlet that the AC is plugged into is turned on and functioning properly. 3. If both of these are successful, your AC may have developed a mechanical issue and need to be serviced. Contact a qualified service technician to inspect the issue in further detail.

Where is Honeywell thermostat reset button?

The Honeywell thermostat reset button can be found on the side or back of the thermostat. This varies depending on the model. To reset your Honeywell thermostat, watch a helpful tutorial video, such as this one from Honeywell Home: The video provides step-by-step instructions to help you reset your thermostat.

Why would a Honeywell thermostat stop working?

A Honeywell thermostat may stop working due to a number of reasons. It may need new batteries, the circuit breaker may be off, the indoor unit may have an open panel door or the power may not be connected to the furnace or air conditioning unit. To troubleshoot this issue, check the batteries, circuit breaker, panel doors and power connection as needed.

Why is my Honeywell thermostat not turning on AC?

Your Honeywell thermostat may not be turning on your AC due to a number of issues. These include an insufficient power supply, incorrect wiring, a problem with the AC unit, outdated thermostat settings, or a malfunctioning thermostat. It’s important to inspect your thermostat, AC unit, and wiring to find the root cause of the issue and repair it.

Why is my AC not responding to temperature adjustments?

The answer is: If your AC isn’t responding to temperature adjustments, it is likely due to low batteries in your thermostat. Replacing the batteries can solve the issue and allow your AC to respond to temperature adjustments again. It is important to replace the batteries in the thermostat regularly to keep the AC functioning properly.

How do low thermostat batteries affect my air conditioner?

Low thermostat batteries can affect your air conditioner’s performance by making it difficult to turn on and off. As the batteries weaken, the thermostat will become less responsive and make it hard to control the air conditioner. In summary, weak thermostat batteries can make it difficult to turn your air conditioner on and off.

What is the RC wire on a Honeywell thermostat?

The RC wire on a Honeywell thermostat is a wire located inside the thermostat body that powers the cooling system in the home. It is plugged into the RC terminal and is an essential component for the thermostat to function correctly. Thus, the RC wire is essential for cooling your home.

Final Thoughts

From the information provided, it appears that if your Honeywell AC isn’t turning on, it could be due to flat batteries. If you are experiencing functionality issues on the thermostat, then low battery may be the cause. Replacing the batteries should resolve the issue, and allow your thermostat to function properly. Taking the steps to continually check the battery life is key to making sure that your Honeywell AC will work properly and efficiently.