If your thermostat has been flashing cool on for longer than five minutes, there may be several issues preventing the system from functioning correctly.
A common issue is a power surge or outage, which can disrupt your HVAC system. However, there are some straightforward solutions you can try to resolve the problem quickly and easily.
1. Check the Power
If your Honeywell thermostat cool on flashing is blinking repeatedly, it could be due to a power outage. Try reseting it and see if that fixes the problem; otherwise, call an experienced technician who can assist in fixing the issue.
Another possible explanation for why your thermostat may be flashing is because the batteries have run out. They usually last 8-24 months, but eventually must be replaced; unfortunately, this is an issue that can affect anyone.
Thermostats should be tested regularly to ensure they are running efficiently and have adequate battery life. You can use a battery tester to inspect the batteries for this purpose.
You can replace the batteries on a device, but be sure to do it carefully so as not to damage the device. After replacing the batteries, any ‘cool on’ messages will disappear.
If the problem persists after replacing your batteries, there could be an underlying wiring issue in your home. This is a common occurrence and may cause your thermostat to flash ‘cool on’. If the wires appear loose, they may need to be tightened for proper operation.
Your thermostat may malfunction if a dirty filter is present, which is why it’s essential to inspect them every six months. Make sure the filters are clean and attached securely; otherwise, your thermostat won’t be able to provide cool air for your home.
Your thermostat might be flashing due to delay mode. This safety measure protects the compressor from damage due to short cycling. It may take some time for the system to adjust and return to normal; you may have to wait up to 5 minutes before it works again.
When your thermostat is set to delay mode, you won’t be able to control the HVAC system during that time. However, you can still turn it on and off as well as adjust the temperature accordingly.
For newer Honeywell thermostat models, it is recommended to regularly schedule maintenance tune-ups so your device runs optimally. Doing this can prevent most unexpected issues and save you money in the long run.
2. Check the Batteries
If your Honeywell thermostat is flashing, it likely means it needs changing batteries. Changing these can be a relatively straightforward job that doesn’t require any special tools and shouldn’t take more than five minutes to complete.
Before you begin, however, be sure to verify the batteries’ polarity and that they are placed correctly. These steps are essential in order for the thermostat to function optimally.
All Honeywell thermostats that use batteries have them stored within the control panel, either behind a sliding tray compartment or within its main body.
The battery compartment of a thermostat can usually be found on the upper right-hand side. To open it, press down on a latch that allows the compartment to slide out.
Once the compartment is opened, locate both batteries and note their orientation (plus side up for left battery, minus side up for right). You should also see markings on the inside of the compartment that indicate which end goes where.
Next, remove the old batteries and replace them with new ones. It is wise to refer to your user handbook or previous installation instructions to determine which batteries work best for your Honeywell thermostat model.
Following the manufacturer’s instructions for replacing batteries is generally straightforward; most models can be pulled away from their wall mounting plate with ease. On some models, however, there may be a decorative cover plate that requires additional steps before you can access the batteries.
Your Honeywell thermostat requires you to place one hand on each side of the faceplate and pull it away from the baseplate. Those with hinges must unhook the cover from its hinges.
Once the batteries have been changed, your thermostat should now work as expected. However, if it still displays a low battery warning, then you may need to reset it in order to deactivate that indicator. The process should only take a few minutes but be patient as new batteries may take some time to charge up.
3. Check the Settings
If your Honeywell thermostat is flashing, you should inspect its settings. Usually, this is a straightforward process that should solve most issues; however, if nothing seems to have changed, contact an experienced technician for further assistance.
First and foremost, make sure your thermostat is connected securely to your system. Furthermore, ensure you have quality air filters installed and that the AC coils are clean and free from corrosion.
Check the batteries in your Honeywell thermostat to ensure they are still functioning properly. This may occur if you haven’t replaced them recently or had to do so due to a power outage.
The Cool On indicator typically blinks for around five minutes, after which cooling will resume. This is a normal function of the air conditioning unit and serves to delay startup and protect it from damage.
Depending on the model, you can try reseting your thermostat to its default settings. This will restore the device and give it a chance to work properly again.
Another way to address a honeywell thermostat cool on flashing issue is by calling an experienced HVAC technician. They will be able to diagnose what’s wrong with your system and make the necessary repairs quickly.
Once the issue is solved, you can enjoy your system once more. It is not unusual for a professional to come out to your home and inspect the wiring, fan motors, and other components of your HVAC system.
Before trying to fix an issue with your Honeywell thermostat, it’s best to consult the user manual. This manual will be specific for your device and should provide some helpful hints and solutions that can assist in troubleshooting.
You may also try resetting your thermostat using its menu button. Depending on the model, this involves pressing and holding down on the button for several seconds.
Following all instructions in your manual will make troubleshooting much smoother. Additionally, calling Honeywell customer service if you can’t resolve your problem on your own is a wise idea if there are any questions for them.
4. Check the Connections
If your Honeywell thermostat is flashing cool on, it’s essential to check the connections of your HVAC equipment to identify what could be causing the issue.
First, confirm the wires coming from your old thermostat are not connected incorrectly. This can be a common misstep that could cause future troubleshooting issues. To check the wiring, take a photo of each connection on your old thermostat and compare them with those on the new one.
Once you’ve identified the incorrect connections, it’s time to replace your old thermostat with a new one. You can do this by following the instructions that came with your Honeywell thermostat or by referring to a photo taken of its wiring.
No matter which model of Honeywell thermostat you replace, your new one will require at least the same number of wires as its predecessor. However, if installing a thermostat designed to control a heat pump, more wires will be necessary than if it was only meant to heat your house.
When replacing a Honeywell thermostat, it’s best to enlist the assistance of an HVAC professional. They will be able to accurately diagnose the problem and provide swift resolution.
Be aware that certain Honeywell thermostat models feature different wire terminals. These terminals are color-coded to identify which wires support each function of the thermostat.
Make sure your new thermostat is correctly connected to the wires coming from your HVAC equipment by inspecting its terminals and connecting them according to industry standard color codes or any unit-specific notes from Step 4.
Once all wires are securely attached, it’s time to connect the wiring from your HVAC equipment to the wires on your new thermostat. This should take only a few minutes. Upon completion, you can rest assured that your Honeywell thermostat is back up and running!
