Honeywell home cool on blinking

Aug 4, 2023 · Honeywell AC thermostats have a cool-on blinking light that indicates the unit is working to cool down the room. This could be due to either an incorrectly set temperature or because of an issue with the thermostat itself. If you find your Honeywell AC thermostat’s cool on light blinking, first check and make sure that you have selected a ...

Honeywell home cool on blinking. Thermostats Take control of your home comfort and save on energy costs with a range of Honeywell Home thermostats. From smart WiFi thermostats with room sensors and humidification control, to programmable and non-programmable thermostats, Honeywell Home products meet a variety of needs.

Compressor protection: A "cool on" or "heat on" message may appear along with a flashing light. Low batteries: Replace the batteries periodically, even if there is no "Replace bat" message . For older analog models, ensure the thermostat is mounted level on the wall and located about 5 feet from the floor.

Honeywell Thermostat Cool On Blinking (Why It Occurs And How To Resolve The Problem - Easy Guide!). In this video tutorial I will show you how to fix Honeywe...Share This Guide. 9 Reasons Your Honeywell Thermostat Won't Turn on AC System. 1) Low Batteries (On Selected Models) How to replace Honeywell thermostat batteries. 2) Bad Thermostat Wiring. 3) Tripped Circuit Breakers. How to reset tripped circuit breakers. 4) Misconfigured Thermostat. 5) Thermostat Compatibility Issues.The WiFi 7-Day Programmable Thermostat has a large easy-to-read display and can be adjusted through your smartphone or tablet for convenience. Utility Rewards Available. SELECT A MODEL: WiFi 7-Day Programmable Thermostat. $99.99. $69.99. In Stock. or 4 interest-free payments of $25.00 with. Add To Cart.Sometimes, all you would have to do to get rid of the blinking ‘cool on’ message is reset the thermostat. If your thermostat has batteries, then insert those backward for 5 seconds to reset the device. To reboot other Honeywell Pro Series thermostats, you would have to: Turn the device on. Press and hold the ‘menu’ button for …Leave the unit for a while and check whether the system is going to start cooling or not. Check other thermostat settings – something might have made your thermostat switch back to setup mode. Also, check the time on the device, as wrong settings can make the ‘cool on’ indicator start blinking. Replace the batteries or check …

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. Place the thermostat back on the wall, turn it on, and check to make sure that the new batteries work. In a lot of ways, replacing the batteries on a Honeywell ...When your thermostat says “cool on” but there’s no air, it could be due to issues with your HVAC system like a tripped circuit breaker, a clogged filter, or a refrigerant leak. First, check your thermostat settings, ensuring it’s in “cool mode” and set to the correct temperature. If the settings are right, try resetting your ...Cool Dehumidify Fan In running mode: Auto switch off In stand-by mode: Auto switch on Press " " or " " button to adjust the time setting for 1 hour intervals. Control • Used for adjusting the timer and temperature. • The default display is room temperature. • When " " or " " key is pressed in cool mode, the setThe 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 …The 4000 series comes with a reset button. To reset, turn on the thermostat and press the "Program" button thrice. Then find the reset button located inside a small hole on the front panel of the thermostat and use a sharp object to press the button for about 5 seconds. Now your thermostat has been reset.SKU: RTH221B1039/U1. Easy to Install and Program With the Honeywell Home 1-Week Programmable Thermostat from Resideo, you can customize comfort to fit your weekly schedule. It's easy to install and works with all standard home HVAC systems. SELECT A MODEL: 1-Week Programmable Thermostat.WIFI SMART COLOR THERMOSTAT Manual & Support. RTH9585WF1006/W, RTH9585WF1004/U. Download Manual. WIFI SMART COLOR THERMOSTAT Product Page.

Here are the main reasons why your Honeywell thermostat is blinking “Cool On”: A power outage: A power outage or some other interruption associated with a power source can trigger the thermostat’s compressor to restart and activate the ‘Cool On’ icon to blink. Chaining the Set Temperature: Readjusting the temperature manually after ...Cool On: Cooling system is on. Heat On: Heating system is on. Aux On: Auxiliary heat is on. (Only for heat pumps with this capability [select models only].) When Heat On or Cool On is flashing, compressor protection is engaged (see page 14). Current day/time (see page 6) Current program period Wake/Leave/Return/Sleep (see pages 9-10) Set ScheduleYou'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 ...In today’s fast-paced world, home security has become a top priority for many homeowners. With advancements in technology, there are now various options available to ensure the saf...Smart Temperature Zoning. The TrueZONE® HZ311 Panel is for conventional, single stage applications for up to 3 zones (1H, 1C) at 24 Volts. It features robust push terminals, common-sense LEDs, variable-speed fan control, and leaves a smaller environmental footprint.Set Program Schedule For Two Time Periods 1. Select HEAT or COOL with the system key. Note: You have to program heat and cool each separately. 2. Press the MENU button (If menu does not appear first, press RUN SCHED). 3. Press SET SCHED.Note: Monday-Friday (Monday if in 7day) is dis played and the OCCUPIED text is shown.You are now program ming the OCCUPIED time period for that day.

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This manual is also suitable for: View and Download Honeywell Home VisionPRO TH8320R1003 user manual online. VisionPRO TH8320R1003 thermostat pdf manual download. Also for: Visionpro th8110r1008, Visionpro th8321r1001, Visionpro yth8321r1002, Visionpro th8320r1003/u. 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. If your Honeywell thermostat is clicking on and off, it could indicate a problem with the thermostat or with the HVAC system. Some possible causes include: Low batteries: If the thermostat's batteries are low, it may make clicking sounds as it tries to power on. Dirty or faulty contacts: If the thermostat's contacts are dirty or faulty, it ...How often do you hear from customers who say their Honeywell thermostats are blinking “cool” or “off”? If you’re having trouble with your Honeywell thermostat, don’t worry – you’re not alone. Honeywell has been around since 1884, and they’ve been innovating ever since. The company was founded by Charles F. Brush, who wanted to createStep one: Setting the time. Start by pressing and holding down the "SET" function until the date or time flashes. After display flashes, use arrow functions to alter and set the correct time. Honeywell Thermostats are equipped with arrow buttons that are essential and handy.Make sure the breaker is in the "ON" position or replace any blown fuses. If the thermostat is battery-powered, check the battery statu s and replace the batteries if necessary. Sometimes, cooling issues can arise if the Honeywell ProSeries thermostat is not correctly connected to the power source.

If you're experiencing the Honeywell thermostat cool on flashing problem, there are einigen troubleshooting steps such can helped. Read this blog post for more info. 914-939-4350It has a red light on heat 1 and zone 1. 3 years. From last night. Heat was blinking red - Answered by a verified HVAC Technician ... honeywell hz221 zone 1 red linght blinking when i set thermostat to heating ... but my T-Stats are all set to cool. I feel cold air coming from the vents but the pipe leading away from my furnace is super hot.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.Check all of the vents in your home for any blockages, and ensure that the thermostat is receiving power. ... Read More Honeywell Thermostat Blinking Cool - Fix Now! Honeywell Thermostat. Honeywell Thermostat Recovery Mode: How To Fix. By Keshav Krishnan January 25, 2023 January 30, 2023.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.Confirm the message "Heat On" is solid (not flashing) on the thermostat display. Confirm your wiring is correct, and the wires have good contact in the terminals (tug gently on the wires) Check your jumper wire. To operate heating, the thermostat requires power to the R terminal. (If you have a wire in the RC terminal and no wire in the R ...Shop by Popular Honeywell Humidifier Models. 2000 HCM-2020 HE220A HE220B HE225A HE225A1006. HE225B HE225B1004 HE260A HE260B HE265A HE265A1007. HE265B HE265B1005 HE360 HE365 HE365A HE365A1006. HE365B HE365B1004 HM506. View more. Ask a customer care specialist We have a trained team ready 24/7 to answer your questions and help you get back on track.The most common problem is that your compressor needs 5 minutes to cool down if your Honeywell thermostat is blinking “Cool On”. Otherwise, you may need to …

Summary of Contents for Honeywell Home T1 Pro. Page 1 T1 Pro Product TH1110D2009 Information TH1010D2000 Built-in compressor protection Thermostat controls Damage can occur if the Message flashes until safe • System status • Indoor temperature compressor is restarted restart time has elapsed. information setpoint too soon after shutdown.

If you use a touchscreen model, press the “Menu” button to access the settings. On settings, scroll through the menu to find the “Reset” or “Factory Reset” option. Once you find it, select it. Now, your thermostat should prompt you to input your password to confirm the reset. Input your correct password now.00:00 - Why is my Honeywell thermostat on cool but not working?00:37 - How do I know if my thermostat is working properly?Laura S. Harris (2021, September 24...In this video, we will walk you through troubleshooting a Honeywell thermostat with a blinking "Cool On" message. If you're having issues with your thermosta...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 does not ...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.Honeywell thermostat alert no power from heat cool system. If you have a Honeywell Thermostat Vision Pro 8000, you may experience some problems with it from time to time. Here are some tips for troubleshooting your Honeywell Thermostat Vision Pro 8000: 1. If the display is blank, make sure that the power is turned on.Here's Why The 'Cool On' Indicator Is Blinking On Your Honeywell Thermostat & How To Fix ItA 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.

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Contents hide 1 Honeywell Home RTH221B Programmable Thermostat 2 Identify System Type 2.1 ATTENTION: MERCURY RECYCLING NOTICE 3 Customer Assistance 4 INSTALLATION 4.1 Install Batteries 5 Set fan operation switch 5.1 Advanced Installation 6 About your new thermostat 6.1 Thermostat controls 6.1.1 Display screen 6.2 …Steps To Fix Issues: Honeywell Thermostat Cool on Not Working. Set Thermostat To Lowest Temperature Setting. Check If Thermostat Is In Setup Mode Or If The Clock Is Set. Check The Thermostat Batteries. Check If Air Handler/Fans, Furnace, And AC Unit Have Power. Check Indoor AC Filter And See If It Needs Changing.If you don't have it, you can contact the Honeywell customer helpline or research online according to your thermostat's model. Final Words. If you notice your Honeywell thermostat green light staying on flashing during installation, setting up, connecting to pairing to some device, or operating modes, it is entirely normal.Aug 28, 2023 · 1. Wait For 10 Minutes. Before you decide to fix the Honeywell thermostat cool-on flashing error, you must wait for about 5 to 10 minutes. As there is a good chance that your thermostat is going through a restart or running some checks. Or it might be facing a slight delay or using the compressor protection feature. While it might seem like a good idea to get instant cold air, it puts unnecessary strain on your system and won't cool your home any faster. Keep your thermostat at a comfortable setting. Whether you're rocking a Honeywell thermostat or a Nest thermostat, consult your user manual to make the most out of its features. 4.1. Pour cool water from a pitcher or jug directly into Water Tank. 2. Fill to the MAX line marked on the outside of the Tank or to the MAX indicator on the Tank Cover. Replace the Tank Cover if it was removed for filling. Option 1: To Fill Tank at the Humidifier Step 1 Step 2 Step 3 Step 4 Step 1 Step 2 Step 4 Step 1 Step 2 1.The most common problem is that your compressor needs 5 minutes to cool down if your Honeywell thermostat is blinking “Cool On”. Otherwise, you may need to …To set your Honeywell Thermostat to permanent hold, you need to first press the + or – button and adjust the temperature. The thermostat will display ‘temporary hold’ along with a flashing setpoint temperature. While the temperature is flashing, press the ‘hold’ button and change it to permanent hold. I was trying to take a nap on an ...Heat On / Cool On flashing on the screen. Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor. Heat pump issues cool air in heat mode, or warm air in cool mode. Check System Setup Option 200 or 218 to make sure it is set to match your heating and cooling equipmentThe unit is the upstairs unit in a 2 story house, and is a Heil, about 9 years old of use, 10 year old since production roughly. Capacitor for this unit was replaced roughly a year ago. As I said in the title, it takes a long time to go to a solid "Cool On" upstairs on the Honeywell thermostat, and when it does the blower comes on.WIFI SMART COLOR THERMOSTAT Manual & Support. RTH9585WF1006/W, RTH9585WF1004/U. Download Manual. WIFI SMART COLOR THERMOSTAT Product Page. ….

Select “Reset”. Select “Schedule Reset”. PERFORMING A HOMEKIT RESET. Press the Menu Icon. Scroll down to “Thermostat Information. Record the “Date Code”. Press the “back” arrow, then scroll down to “Installer Options”. Enter the Date Code when prompted to “Enter your password”. Select “Reset”.Step 1: Turning Off the Power. Safety first! Before diving into any troubleshooting, ensure the furnace's power is turned off. Locate the power switch near the furnace or the circuit breaker that controls its electricity supply. Switch it off to prevent any electrical accidents while you work on the furnace.Aug 4, 2023 · Honeywell AC thermostats have a cool-on blinking light that indicates the unit is working to cool down the room. This could be due to either an incorrectly set temperature or because of an issue with the thermostat itself. If you find your Honeywell AC thermostat’s cool on light blinking, first check and make sure that you have selected a ... All Honeywell thermostats, no matter the type of model, have a symbol showing you when the air conditioning is turned on. It can be a snowflake or it may say "cool on.". When the air conditioner is actually running it will be a steady symbol, but you may notice it flashing at times. This indicates that your HVAC system is in a delay mode.If your thermostat is blinking “cool on” one of three things has taken place. Someone tried to restart the compressor before the refrigerant had time to settle. A sudden change from cool to heat, or heat to cool. Changing the batteries in your system may also cause this to happen. Honeywell thermostats are equipped with a second line of ...To adjust program schedules (RTH221) Press SET until Set Schedule is displayed. Press s or t to set your Wake time (Mo-Su), then press SET. Press s or t to set the temperature for this time period, then press SET. Set time and temperature for the next time period (Leave). Repeat steps 2 and 3 for each time period.Some thermostats keep blinking the cool on message, but now you don't have to worry about it. The Honeywell Pro series thermostat cool on flashing can be fixed differently. Keep trying these steps, and your Honeywell thermostat will start functioning like before and release all your stress by giving out the natural cool-on effect.Honeywell Home Standard Heat/Cool Manual Thermostat - CT51N . MPN: CT51N1007/E1. $32.95 Save: $14.00 Quick view Honeywell Home Smart Room Sensor for T9/T10 Thermostats, 1-Pack . MPN: RCHTSENSOR-1PK/E ... Honeywell Home Wi-Fi 7-Day Programmable Thermostat - RTH6580WF Reviews. Peglomaniac February 14, 2024.Aug 3, 2020 · 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. Honeywell home 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 …, A persistent blinking 'Cool On' message, even after attempting to resolve the issue. Remember, sometimes, knowing when to let go and upgrade is the best solution to ensure things function properly. Summary. To wrap things up, a blinking 'Cool On' message on your thermostat is not the end of the world., Confirm the message "Cool On" is solid (not blinking) on the thermostat display. Confirm your wiring is correct, and the wires have good contact in the terminals (tug gently on the wires) Check your jumper / R wire. Thermostats get power on the R and Rc terminals.If you have a wire in the R terminal, and no wire in the RC terminal, use the ..., The blinking "Cool On" means the cool cycle is in delay (5 minute by default). If it's continually blinking then either the thermostat is bad, or there's a short in the low voltage wiring that's causing it to reset everytime it tries to come back on (basically resetting itself over and over). 2. Reply. Effective-Brush9301., Select "Reset". Select "Schedule Reset". PERFORMING A HOMEKIT RESET. Press the Menu Icon. Scroll down to "Thermostat Information. Record the "Date Code". Press the "back" arrow, then scroll down to "Installer Options". Enter the Date Code when prompted to "Enter your password". Select "Reset"., 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., To reset the system's schedule, press the System button. Next, hold the blank box that's in the center of the screen. When the numbers panel comes up, enter 0165 on the left and the number one on the right. Now press Done and your thermostat should have a reset schedule., Curious about your Honeywell thermostat's blinking 'Cool On' indicator? Decode the signal, troubleshoot, and keep your cooling system in check effortlessly. ... The 'Cool On' blinking serves a crucial purpose: it's all about safeguarding your heating and cooling equipment. This delay, which can last up to five minutes under normal ..., Thermostat features. The Honeywell T6 Pro Z-Wave Programmable Thermostat is a Z-Wave Plus certified thermostat designed to work with any Z-Wave compliant controller or gateway for easy programming and automation to deliver energy savings and comfort at the same time., Replacing an old Honeywell thermostat usually involves changing to a newer model or to an energy-efficient programmable digital thermostat. This process is straightforward and can ..., To check the underline code behind the warning sign, follow these steps below: Step 1: The alert icon appears on the Home screen. Step 2: Press Menu, and then press until the display shows ALRT. Step 3: Press 'Select' to display which alert (s) are present. Step 4: The message REPL (REPLACE AIR FILTER) appears., View and Download Honeywell TH8321WF1001 user manual online. TH8321WF1001 thermostat pdf manual download. Also for: Th8321wf1001u, Wi-fi visionpro 8000 series. ... the screen light may always be on. HOME. Touch to display Home screen. FAN. ... Cool: Controls only the cooling system. Heat Cool Auto Off: Heating/cooling systems are off. Auto ..., Look along the top of the thermostat and locate the button which reads 'press'. Press down on the button. This will release the battery pack area, which will rotate outward, and then should slide completely up and out. Remove the old batteries and dispose of them properly. Replace with new batteries., 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., 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 malfunctioning thermostat. By troubleshooting the problem step by step, you can determine the precise cause and take the appropriate action to resolve it. Reasons For The Cool On Blinking Indicator., 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., Page 1: Application. ® VisionPRO 8000 with RedLINK™ PRODUCT DATA • Sensor Inputs Thermostat - S1 EIM - S1, S2, S3, S4 Assignable inputs allow you to setup Indoor and Outdoor Temperature Sensors, Discharge and Return Air Sensors or Dry Contact Devices. Dry Contact Devices can be used to trip pre-set or customized alerts on the thermostat ..., 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., If you notice a blinking snowflake or flame emblem on the screen of your thermostat when you try to turn on your air conditioner that means that your system just recently shut off and the thermostat is in delay. When you try and start your air conditioner before the delay timer has gone off it will show the snowflake emblem on your thermostat ..., TH4110B 5-2 DAY PROGRAMMABLE THERMOSTAT Manual & Support. TH4110B1009/U, TH4110B1025/U, TH4110B1033/U, TH4110B1017/U. Download Manual Download Installation Guide. Download Service Datasheet. TH4110B 5-2 DAY PROGRAMMABLE THERMOSTAT Product Page., A luz Cool On do termostato Honeywell começou a piscar? Ou seu termostato Honeywell não está funcionando! Não se preocupe. É um problema bem mais comum do que você imagina. Na verdade, em 90% dos casos, não será realmente um grande problema. É apenas um 'recurso' do termostato Honeywell., Honeywell Home Pro Series Tstat keeps flashing "cool on". Any idea why? New install 2 months ago. Doesn't seem to cool while this is happeneing. Related Topics HVAC Skilled trades Careers comments sorted by Best Top New Controversial Q&A Add a Comment TigerTank10 ..., A constant green light when the system is in AWAY mode. A momentary purple light followed by a slow, blinking purple light as the system is switching to NIGHT mode — you'll also hear dings to match the blinking light. A pulsing yellow light when a firmware update is available. A fluttering amber or red light when the system notices …, 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., A blinking snowflake on a Honeywell thermostat is mostly caused by activated delay mode or an activated saver switch (if you are subscribed to one). This issue can be fixed by simply waiting for the delay time to elapse which is typically about 5 minutes or switching the saver switch off, respectively. Also read: Honeywell thermostat blinking ..., 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, An incorrect display can cause your Honeywell thermostat cool on to blink. To troubleshoot, verify the thermostat’s settings and programming: Ensure the thermostat is set to “cool” mode. Check if the cool on indicator is blinking or a solid light. Review your programmed temperature settings to ensure they’re accurate., 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., The red light is triggered by a float inside the humidifier's tank. The float activates a water level switch when the water level becomes too low. Once activated, the red light indicator is displayed, signaling to the user to refill the tank. "The red light blinking on the Philips Humidifier indicates low water levels in the tank."., If you're living an Honeywell regulator cool on flashing fix, at are multiple troubleshooting steps that pot help. Read this blog post for more info. 914-666-9100, If you're experiencing the Honeywell thermostat cool on flashing problem, there are einigen troubleshooting steps such can helped. Read this blog post for more info. 914-939-4350, There might be two reasons in Honeywell thermostat' blinking: 1.With a heat pump installation process, blinks are replaced with "flashing.". If the thermostat is installed in this type of system, then compressor protection should be checked. To do so one must see if an "on" message appears when pressing either cool or warm buttons on ..., Aug 4, 2023 · Honeywell AC thermostats have a cool-on blinking light that indicates the unit is working to cool down the room. This could be due to either an incorrectly set temperature or because of an issue with the thermostat itself. If you find your Honeywell AC thermostat’s cool on light blinking, first check and make sure that you have selected a ...