Honeywell home pro series blinking cool on

Honeywell Th1110D2009 Troubleshooting. 1. Check the power source to make sure it is connected and working properly. 2. Make sure all connections are secure, including any wiring that connects the thermostat to your HVAC unit or other components of your home heating/cooling system.

Honeywell home pro series blinking cool on. Low Batteries. A blinking “Cool On” message can appear due to dying batteries, a power surge, or a power outage. Thermostat batteries last for an average of 10 months, so it is easy to tell when dead batteries are the culprit. Sometimes, a Honeywell thermostat can bounce back after a power outage without requiring a reset.

honeywell pro series cool on blinking. Thermostat Honeywell programmable. ... 5800SMOKEV Resideo Honeywell Home Wireless Combo Smoke/Heat Detector. ... 7-Day Programmable Thermostat with Digital Backlit Display. Honeywell TH3110D1008 Pro Non-Programmable Digital Thermostat. Related searches. middle part low bun; redmi a2 64; canon rf adapter ...

To factory reset this thermostat, first press the System button. Now you must press and hold the blank box that's in the center of the screen. When the number panel is displayed, set the number on the left to 0710 and the number on the right to one. Once this is done, press the Done button.Last updated. 2/25/22. Remove the thermostat from the sub base. If the sub base is securely connected to the wall, the face plate will disconnect if pulled straight out from the wall. Remove the current battery and replace it with a new AAA lithium battery (make sure the battery polarity matches the markings on the sub base). Reconnect the face ...Hold Run. Press the SET button, then press s or t to set the clock time. Press the SET button, then press s or t to select the day of the week. Press RUN to save & exit. M33598 Note: If the clock flashes, the thermostat will follow your settings for the Monday "Wake" time period until you reset the time and day.Crank thermostat down to the lowest temperature. The first step is to determine if your system is cooling at all and if it can control it. To check this, turn down your thermostat to its coldest setting. After setting it to the minimum temp, double-check the mode is set to 'Cool.'. Also, make sure the fan setting is set to 'Auto.'.How do I fix a blank display on my TH6210U2001, TH6220U2000, TH6320U2008 thermostat? If the thermostat is battery powered, check/replace your batteries. If the device is common wired, try and power it up with batteries. If that fails to power up the thermostat, you may need to involve a technician. If batteries do power up your common wired ...Lower thermostat setting. One of the easiest fixes is to test whether the thermostat is able to control the cooling in your home. Lower it down to the lowest setting, and leave it for an hour or two to see if the temperature changes at all. It could be as simple as the system just needs to cool down.WIFI SMART COLOR THERMOSTAT Manual & Support. RTH9585WF1006/W, RTH9585WF1004/U. Download Manual. WIFI SMART COLOR THERMOSTAT Product Page.Connect with a ProSeries pro. World-Class Security. Motion viewers and sensors, video verification, glassbreak detectors, and professional monitoring 24/7 provide ultimate 360-degree protection. Whole-home Safety. Heat, smoke, flood, and carbon monoxide sensors detect potential danger in your home, triggering audio and visual evacuation warnings.

View and Download Honeywell Home 9000 Series user manual online. Smart Colour Touchscreen Thermostat. 9000 Series thermostat pdf manual download. ... Thermostat Honeywell Home T6 Pro Series Installation Instructions Manual (44 pages) ... Page 49 Glossary Heat Pump heating/cooling system Heat pumps are used to heat and cool a home. If your old ...2 Oct 2021 ... Honeywell Home 9000 Series thermostat and Vision Pro ... Honeywell 9000 Series WiFi PLUS How to Install and Configure ... "Cool On" Is Blinking ...Turn off your Honeywell Thermostat switch. Open the battery slot by pressing the door down and sliding it out. If this doesn't work, try inserting a coin or some similar object in the slot. Once you have opened the battery slot, slide the batteries out. Re-insert the batteries, but put them in a reversed position.POPULAR VIDEOS. How to properly remove an old thermostat for replacement. Modal 1. How to Install A Honeywell Home T3, T4, T5, T6, and T9 Thermostat (Video) Modal 1. How to enter and navigate advanced programming on the T6 Pro thermostat. Modal 1. How to program schedules on the T6 Pro thermostat. Modal 1.2/22/22. If your thermostat is newly installed and the heat pump worked for cooling with the previous thermostat, check the following: 1. Verify that the thermostat is set to cool and is calling for cooling, usually indicated by the words "cool on," a snowflake icon, or a shimmering snowflake icon. If the room temperature is below the cool set ...

You'll have to look in your thermostat's manual to find the specific unlocking procedure for your Honeywell thermostat model. With some models such as the T4 Pro, you must press the "+/-" or "up/down" buttons and then press "Cancel" or "Remove hold.". You can deactivate the Lyric T5 Wi-Fi by pressing "Permanent Hold" and ...This is a common reason why the Honeywell thermostat fan won't turn off. Solution. Check the fan setting on the thermostat: Locate the thermostat and ensure it is in the "auto" mode. Check if the fan is set to "on" or "auto." If it's set to "on," switch it to "auto." Also read: Honeywell thermostat offlineOkay, let's try this: first, turn the thermostat off, then remove the batteries from the thermostat and leave out until the display goes completely blank. Now, reinstall the batteries and turn the switch back to cool and lower the desired temp below the indoor temp. The 'cool on' may flash, but leave the thermostat alone for 5-10 minutes and ...If you're experiential the Honeywell thermostat cool on flashing problem, there are few troubleshooting steps that can help. Read this blog post for more info. 914-666-9100Modal. 1 Press and hold Menu and + buttons for approximately 5 seconds to enter advanced menu. 2 Press Select to enter System Setup (ISU) menu.Contents hide 1 Honeywell Home T6 Pro Wi-Fi Programmable Thermostat 2 Thermostat Features 3 Thermostat overview 3.1 Resideo App overview 4 Adjusting the temperature 5 Schedule overrides 5.1 Adjusting the temperature in Auto mode 5.2 Selecting system mode 5.3 Setting the fan 6 Connecting to a WiFi network 6.1 Disconnecting and …

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If your Honeywell thermostat won't go above 68, there could be a few possible issues. First, you should check the setting on the thermostat to make sure it is set to heat and not cool mode. If it is in heat mode but still won't go above 68, then you may need to replace the batteries if it uses them or reset any circuit breakers that are ...Last updated. 8/29/22. Why is my thermostat display showing “wait,” “waiting for equipment,” or flashing “cool on”? Each thermostat model has a different display message when a delay occurs. This delay can be up to five minutes under normal operating conditions.Blink cameras are a popular choice for home security, providing users with peace of mind and the ability to monitor their property remotely. However, one common issue that users ma...This will be a helpful reference when wiring your new thermostat. Tip: If the color of your wires has faded or if 2 terminals have the same wire color, use the wire labels provided in the package to label each wire. 1/4" to 3/8". RTH5160 Series. 6 Record which R-wire(s) you have and write down the color of the wire(s).If you need to reset your Honeywell Home Pro Series thermostat, the process is quite simple. First, locate the control panel on the front of your thermostat and press down firmly for at least 3 seconds until all buttons appear on the display screen. Once they do, look for a button labeled "Reset" or "System Reset" and press it once to ...

Here are some quick tips on resetting the factory setting to most Honeywell thermostats: 1. Confirm your thermostat is ON. 2. Press and hold down the MENU button for 5 seconds. 3. Use the scroll buttons to move to RESET. The button should lead to left scrolling. 4.Oct 4, 2023 · Look for the power button on the thermostat and press and hold it for about 5-10 seconds until the display turns off. Once the display is off, release the power button and wait for a minute or two. Then, press the power button again to turn on the thermostat. This should reset the controls and make them responsive again. 20 Apr 2020 ... HONEYWELL Home T4 Pro | HOW to ... Honeywell Pro Series Thermostat Battery Replacement (BATT) ... HVAC Thermostat Blinking Cool On But A/C Not ...Programming Honeywell Pro 3000 Thermostat. Honeywell Pro 3000 Thermostat User Guide: Jones Air Conditioning And Electric. 3920 Progress Ave. | Naples, FL 34104 | 239-596-5855. "Measure Success One Customer At A Time". AC Lic # CAC1813838 Elec Lic # EC0002113. Serving the Naples, Marco Island, Bonita Springs, Estero & San Carlos Park areas!I have a Honeywell home pro series, the cool on is flashing but the ac will not come on. TH411OU2005. For the last - Answered by a verified HVAC TechnicianFirst check that the thermostat is set to the Heat position. Make sure the temperature is set higher than the Inside temperature reading. Also check the circuit breaker and reset if necessary. Make sure that the furnace door is closed securely. If “wait” is in the screen or “heat on” is flashing – wait 5 minutes for the system to ...If your Honeywell thermostat is displaying a "Cool On" message and blinking, but the unit is not actually cooling, there are several potential causes. First, check to make sure that the batteries in the unit are fresh and have enough power. Next, check that all of the wires are properly connected. If everything looks good there, then the ...Make sure function 38 is set to 1, then proceed to function 39. Use the up or down arrow to change function 39 function to 0 then press done. WiFi setup will then be displayed on the screen.*. Step 2 – Connect the thermostat to your home WiFi (via an internet browser on your mobile device) After connecting to the thermostat WiFi ...

On my Honeywell Home Pro Series thermostat there 3 things going on. 1. Cool on is flashing in top left corner. 2. A triangle is light in middle of top of display. 3. Top right corner by Wi-fi there is … read more

POPULAR VIDEOS. How to Install A Honeywell Home T3, T4, T5, T6, and T9 Thermostat (Video) Modal 1. How to set up your Honeywell Home T5 or T6 Pro Thermostat. Modal 1. How to program schedules on the T6 Pro thermostat. Modal 1. How to enter and navigate advanced programming on the T6 Pro thermostat. Modal 1.The Honeywell Home T1 Non-Programmable Thermostat mounts easily and works with several heating and cooling systems including electric warm air, gas and electric hydronic. ... The T1 Pro Non-Programmable Thermostat comes with the standard UWP mounting system. The soft key controls (with a 2.37 sq. in. display) and the easy-to-read LED back light ...To do this, find the various schedules on the display on your thermostat. Press the set button to get past the time and day. When you get to a scheduled time you want to cancel, press the hold button for about 5 seconds. Once the numbers on your screen changes to zero, press "Set" to lock in the changes.I have a Honeywell Home push button heat/cool thermostat.It was installed last winter, and worked perfectly. however this year it doesn't keep the set tempature. temporary keeps showing. read more RickStep 1: Check your Honeywell thermostat's mode. In some cases, your thermostat can switch to the "Setup Mode", especially if there has been a recent power cut in your area. Check the settings to make sure your thermostat is in the correct mode. Moreover, you should also ensure that the correct time is set on the device.However, if the blinking persists, it might signal something that needs your attention. Common Reasons for Honeywell Thermostat Blinking Cool On. System Starting Up The Honeywell cool on blinking is often seen when the system is just starting up. It’s a brief pause to ensure the compressor doesn’t cycle too quickly, usually lasting no more ...Connect with a ProSeries pro. World-Class Security. Motion viewers and sensors, video verification, glassbreak detectors, and professional monitoring 24/7 provide ultimate 360-degree protection. Whole-home Safety. Heat, smoke, flood, and carbon monoxide sensors detect potential danger in your home, triggering audio and visual evacuation warnings.On my Honeywell Home Pro Series thermostat there 3 things going on. 1. Cool on is flashing in top left corner. 2. A triangle is light in middle of top of display. 3. Top right corner by Wi-fi there is … read moreII. Cool On Blinking on Honeywell AC Thermostat A. Overview of the Cool On Blinking issue. The cool on blinking issue on a Honeywell AC thermostat is one of the most common problems reported by users. When the cool on indicator light blinks, it indicates that there is an issue with the cooling system or thermostat that needs attention.

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In this video I explain what Temporary and Permanent Hold are on a Honeywell Pro Series Thermostat. I show you step by step how to select Temporary Hold and ...Fix 1: Check if the batteries were installed correctly. Fix 2: Change the batteries! Fix 3: Reset honeywell thermostat after replacing batteries. Other fixes. Inspect the thermostat- something may have gone wrong! Shut the access door (on the furnace) correctly. Reset the circuit breaker/replace the fuse. Replace the Thermostat.Temperature settings do not change. Make sure heating and cooling temperatures are set to acceptable ranges: • Heat: 40 °F to 90 °F (4.5 °C to 32.0 °C) • Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C) “Cool On” or “Heat On” is flashing. • Compressor protection feature is engaged.Flashing cool on. Contractor's Assistant: Do you know the model of your Honeywell thermostat? How old is it? 3 years old, honeywell home pro series. Contractor's Assistant: How long has this been going on with your Honeywell thermostat? What have you tried so far? Turned off circuit breakers for ac and furnace, turned back on, new batteries in thermostat, cleaned ac unit yesterday, today fan ...10 DIY Ways to Fix Honeywell Thermostat Cool On Blinking. Here are 10 common troubleshooting tips to stop your Honeywell thermostat from blinking Cool On: 1. Wait 10 Minutes; As mentioned if the blinking Cool On goes away after 5-10 minutes, the system likely just needed time to start up and begin cooling your home.The little green light on the back of your HP desktop indicates the health and well-being of your power supply unit. Normally this light glows a steady green, but damage to the PSU...7 Problems of Honeywell HZ311 Thermostat With Troubleshooting Guide. Problem 1: Incorrect Temperature Readings. Problem 2: Connectivity Issues. Problem 3: Unresponsive Controls. Problem 4: Heating or Cooling System Not Working. Problem 5: Display or Interface Issues. Problem 6: Short Cycling. Problem 7: Sensor Problems.On a Honeywell thermostat, a message that says ‘temporary’ indicates that the device is on a temporary hold. During this period, the thermostat will keep the temperature in your house at a certain setting. Once the temporary hold expires, the device will get back to its normal schedule. You get to decide when the temporary hold should …Honeywell home pro series thermostat heat on blinking. Honeywell is a well-known brand that manufactured a thermostat. The thermostat itself is a device that helps you to maintain a suitable temperature inside your house by triggering an air conditioning or heating system when the temperature rises or drops from a particular temperature that ...WiFi Smart Thermostat Manual & Support. RTH9580WF1005/U1. Download Manual Download Installation Guide. Download Service Datasheet. WiFi Smart Thermostat Product Page.One of the most straightforward troubleshooting steps to address the “Honeywell thermostat blinking cool on” issue is to verify whether the thermostat can effectively control the cooling in your home. Here’s a simple procedure to follow: Lower the thermostat setting to its lowest temperature setting.If you have forgotten your 4-digit passcode, there are two things that you can try out to unlock your Honeywell thermostat: Insert 1234 as the passcode. If that didn't work, then look inside the thermostat and take note of the 4-digit date code; after that, add 1234 to the number. For example, if the date code is 0919, then insert 2153 as the ... ….

2. Common Issues with Honeywell Thermostat 2.1. Cool On Blinking. The Honeywell thermostat is flashing cool, which is a symbol that means there’s a problem. Your thermostat wants cool air, but the cooling system isn’t working correctly. It can be frustrating, especially on hot summer days when you want your home to stay nice and …Page Contents. 1 Understanding Your Honeywell Thermostat; 2 Initial Checks And Quick Fixes. 2.1 Ensuring Power Stability For Your Thermostat; 2.2 Verifying Proper Thermostat Settings; 2.3 Cleaning And Maintenance To Prevent False Alarms; 2.4 Reset Procedures For Honeywell Thermostats; 3 In-depth Troubleshooting Steps; 4 …With you're learning and Honeywell thermostat cool turn flashing problem, there are some troubleshooting steps that sack help. Read this blog post for more info. ... If you're experiencing the Honeywell thermostat cool on beaming symptom, there are some troubleshooting steps that can find. Read this blog post for further news. 914-666-9100 ...Honeywell thermostat flashing "cool on". A/C is not blowing cold air. : r/HVAC. Honeywell thermostat flashing "cool on". A/C is not blowing cold air. Thermostat is set to 70°. It's currently 76°. First time I've ever seen this. Please help! Two kids are human heaters and need the cool air when they sleep.Page 10: Thermostat Mounting. Thermostat mounting 1.Push excess wire back into the wall opening. 2. Close the UWP door. It should remain closed without bulging. 3. Align the UWP with the thermostat, and push gently until the thermostat snaps in place. 4. Turn the power on at the breaker box or switch.All Honeywell thermostats that have batteries store the batteries in the control panel. Locate the batteries by removing the battery compartment tray or cover or by removing the unit’s faceplate. Carefully extract the batteries, and replace them. Be sure to place the batteries in the correct orientation. The battery-powered control unit of ...Share This Guide. Reasons A New Honeywell Thermostat Would Blow Hot Air on Cool Mode. 1) System Is in Delay Mode. 2) You Are Using a Conventional System. 3) Your Outdoor Unit Has No Power Access. 4) Bad Thermostat Wiring.Disconnect all the wires connected to the thermostat. Make sure you don't mix them up while reconnecting. Remove the device from the wall plate. Remove the batteries and wait for five minutes. Replace the batteries and reconnect the wires. Turn on the system and wait for five minutes.In today’s fast-paced world, it’s important to keep an eye on your home even when you’re not there. That’s where the Blink Home Monitor App comes in. One of the standout features o... Honeywell home pro series blinking cool on, If you have a C wire, place it into the C terminal on your wall plate. C wire adapters are available here. Let’s look at the G wire. This wire goes to the G terminal on your new thermostat. Of the Y, Y1, and Y2 wires, Y or Y1 go to the Y terminal and Y2 to the Y2 terminal. The O/B wire can have many configurations., PROA7 ProSeries 7 Inch All-In-One Panel. All-in-one Security system serves as a central hub for security and life safety with a wireless controller, communicator, microphone, speaker and siren. Supports wide selection of sensors and devices using SiX™ two-way, wireless technology with highly secure AES-128 encryption., Confirm you have a C wire in the C terminal. If your previous thermostat did not use a C wire, it's unlikely that it is connected at the equipment. Verify the C wire is connected to the C terminal in your furnace or air handler. Check your jumper selector switch. If you have a wire in the R terminal and no wire in the RC terminal, verify the ..., Thermostat is not turning on the a/c. the "cool on" is blinking slowly. Honeywell. I think the model # is TH3110D1008 - Answered by a verified HVAC Technician. We use cookies to give you the best possible experience on our website. ... I have a Honeywell home pro series, the cool on is flashing but the ac will not come on. ..., WIFI SMART COLOR THERMOSTAT Manual & Support. RTH9585WF1006/W, RTH9585WF1004/U. Download Manual. WIFI SMART COLOR THERMOSTAT Product Page., Press the 'Up" or "Down" arrows until the right side of the screen changes from 1 to 0. Select "Done." Allow two minutes for "WiFi Set-up" to appear on the thermostat screen. On your mobile device, turn on Airplane mode, turn on WiFi, then select and connect to the “New Thermostat xxxxxx” network., The FAN selection key has two or three positions: Auto, On, and on select models, Circ (Circulate). The Auto position will allow the system fan to operate whenever the heating or cooling system is turned on by the thermostat. The fan will not blow air unless there is a call from the system. This is the normal setting for a system fan., If you have forgotten your 4-digit passcode, there are two things that you can try out to unlock your Honeywell thermostat: Insert 1234 as the passcode. If that didn't work, then look inside the thermostat and take note of the 4-digit date code; after that, add 1234 to the number. For example, if the date code is 0919, then insert 2153 as the ..., 3. Tripped Circuit Breaker. Main Fix: Reset the Tripped Switches. A tripped circuit breaker can cut power to the thermostat, causing the screen to go blank. Locate the circuit breaker panel and check for any switches in the "off" position. Carefully flip them back to the "on" position., System Mode Settings. 1) Get to the Home Screen This is an easy one, press the Home button and you're there. This will be your hub to navigate the rest of your options. 2) Select your System Mode Press the Mode button to cycle through the Heat, Cool, and Off modes until the one you want is displayed., My ac system has a Honeywell thermostat and the ac isn't coming on the "cool on" is blinking the drain pipe isn't - Answered by a verified HVAC Technician. We use cookies to give you the best possible experience on our website. ... Our honeywell home pro series is showing an alert "ACPower., On my Honeywell Home Pro Series thermostat there 3 things going on. 1. Cool on is flashing in top left corner. 2. A triangle is light in middle of top of display. 3. Top right corner by Wi-fi there is … read more, This is a common reason why the Honeywell thermostat fan won't turn off. Solution. Check the fan setting on the thermostat: Locate the thermostat and ensure it is in the "auto" mode. Check if the fan is set to "on" or "auto." If it's set to "on," switch it to "auto." Also read: Honeywell thermostat offline, Remove your thermostat from the wall, and open the battery holder on the side of your thermostat. Remove the old batteries and clean the inside of the holder. Insert the fresh set of batteries and close the battery holder. Remount the Honeywell thermostat on the wall again. Ensure that it clicks into position., First check that the thermostat is set to the Heat position. Make sure the temperature is set higher than the Inside temperature reading. Also check the circuit breaker and reset if necessary. Make sure that the furnace door is closed securely. If "wait" is in the screen or "heat on" is flashing - wait 5 minutes for the system to ..., If you have a heat pump, you will not use a wire in the W terminal. Move the W wire to the W2 or Aux terminal. (W controls your first stage of heating for Gas/Oil/Electric systems. O/B and Y control your first stage heating for heat pump systems. Backup heat sources must be connected to the W2, Aux, or E terminal for proper functionality.), RECONNECTING A THERMOSTAT TO A WIFI NETWORK. If your device was previously connected, please remove the face plate from the wall plate for 30 seconds and then reconnect it. After. 2 minutes, check the following: WiFi Icon is present. Look for it in the top right or top left corners of the thermostat display. If the icon is present and …, Clean the slot from dust and insert the new batteries. Ensure that you place the positive and negative sides of the batteries in the appropriate positions and slide the slot back into the thermostat. If the thermostat display is still blank, you have to keep on troubleshooting. Step 4. Check the wiring., The Honeywell AC thermostat is displaying a blinking "Cool On" indicator. In this situation, it is important to troubleshoot the issue to identify the cause and find a solution. A blinking "Cool On" indicator on a Honeywell AC thermostat can indicate various problems, such as a wiring issue, a faulty temperature sensor, or a ..., Amazon customers can also recycle their old cameras by requesting a free UPS shipping label through the Amazon Recycling Progam. Amazon is now offering to replace customers’ discon..., Hello I have a Honeywell T4 Pro that was flashing "Cool On" on the right side of the screen. Nothing seems to help I did replace the batteries and it stopped blinking and now it is solid "Cool On" When I run the test it does kick the AC on. So the AC itself is fine. It seems like it is something with the thermostat. It has fresh batteries., If your thermostat has been flashing “cool on” for several minutes and no cool air is coming out, check your thermostat’s settings. A recent power outage could have triggered the thermostat’s “set-up mode,” explaining the blinking message. If it is in set-up mode, change it back to the correct setting. You can go through the ..., A full WiFi Reset can be performed one of two ways: When registered with the Resideo App - Login, select the thermostat, then select the settings icon in the top-right corner. The "Reset WiFi" option is located at the bottom of the screen. Follow the prompts in the app to reconnect, or to connect your thermostat to another WiFi signal., If the room temperature is below the heat set point, the thermostat display should indicate a call for heat. 2. Confirm that the circuit breakers are on. 3. If you installed the thermostat yourself, ensure that the wires are matched correctly and securely connected at the thermostat. 4., Check the circuit breaker to your equipment. Confirm the thermostat is set to Cool mode and the setpoint (the smaller number at the top of the thermostat display), is set to a temperature lower than the display temp (the larger number in the center of the display). Confirm the message "Cool On" is solid (not flashing) on the thermostat display., Press the button below System on your Honeywell thermostat. This will reveal a blank box. Hold the blank box until your Honeywell thermostat's screen changes and displays your Model ID. Most Honeywell thermostats' Model ID starts with TH or RH and ends in numbers. Next, tap on the Menu option., Understanding the "Cool On" Indicator. Before we dive into the fixes, let's understand what the "Cool On" indicator means on a Honeywell thermostat. When the thermostat displays "Cool On," it signifies that the cooling system is supposed to be running to maintain the set temperature in your home., Step 1: Check your Honeywell thermostat's mode. In some cases, your thermostat can switch to the "Setup Mode", especially if there has been a recent power cut in your area. Check the settings to make sure your thermostat is in the correct mode. Moreover, you should also ensure that the correct time is set on the device., Need help with your Honeywell Home Thermostat device? Browse our library of help & support resources and guides or contact us today. ... Pro 2000 Horizontal Programmable Thermostat Support; T6 Pro Smart Thermostat Support; T5/T5+ Smart Thermostat Support; Smart Home Partners REGISTER YOUR PRODUCT., I have cool on flashing on the thermostat and the air conditioning is not working. Just Honeywell maybe 5/6 years. ... Have a Pro series set the air conditioning for 24.0 the air is cooling to 21.5. I changed the temperature set but it keeps cooling to 21.5. ... On my Honeywell Home Pro Series thermostat there 3 things going on. 1. Cool on is ..., November 19, 2022. When you see the “Cool on” light on your Honeywell thermostat blinks you perhaps don’t know whether it is “normal” or not. Probably you are used to seeing it blinking from time to time but now it is flashing continuously., Reason 7. Low on Refrigerant/ Refrigerant Leak. A refrigerant leak or low levels of refrigerant in your Honeywell thermostat can lead to short cycling. In this situation, short cycling occurs when the low-pressure switch shuts off the system when it detects low refrigerant., Step 1: Check your Honeywell thermostat's mode. In some cases, your thermostat can switch to the "Setup Mode", especially if there has been a recent power cut in your area. Check the settings to make sure your thermostat is in the correct mode. Moreover, you should also ensure that the correct time is set on the device.