Honeywell ac blinking cool on

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. The On ...

Honeywell ac blinking cool on. Honeywell Non-Programmable Thermostat Troubleshooting. If your Honeywell non-programmable thermostat is not working, first check the batteries and replace them if needed. Ensure the thermostat is set to the correct mode (heating or cooling). Verify the thermostat's wiring is correctly connected.

The low refrigerant level is the most common reason the Honeywell HZ311 is showing a red light. It results in the HVAC system not being able to cool the air effectively, so warm air circulates throughout your home. In this case, the compressor will continue to work non-stop, trying to cool the air to the desired temperature, which, in the end ...

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.If the Honeywell Thermostat says “Cool On”, set the temperature to the absolute lowest setting. After that, just re-install the Honeywell software and see if that changes anything. Tech Support 24/7. Ask an Appliance Repairman Online. Connect with the Expert via email, text or phone. Include photos, documents, and more.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 ...The thermostat is a piece of our home we instinctively trust.We rely on it all the time to ensure that we can get comfortable as we relax.Unfortunately, that trusty thermostat could also be the source of confusion and frustration inside your home.One morning, you may find the temperature to be chilly even though your Honeywell thermostat is saying something different.Most Honeywell thermostats blink when in a time delay for cooling (or heating if it is a heat pump). This time delay feature protects the compressor from cranking too soon following a short off cycle or a power outage. The “cool on”, “heat on”, snowflake or flame icon will be blinking if this is the case. Honeywell Wireless Thermostat ...If you see a cool on blinking on your thermostat it means that there is fault in the thermostat wiring or the battery is dying. The Cool On message also appears on screen when AC gives a 5 minutes cooldown time to the compressor or if blower motor is not working properly. A dirty Air Filter can also be the reason for cool on blinking on …2. Check the coils in your air conditioner. Dirty air conditioning unit coils may be to blame for a thermostat that continuously flashes "cool" when turned on. Similarly to filthy air filters, dirty cooling coils may have a substantial impact on cooling. However, this may be due to the fact that coils are not checked as regularly as filters.View and Download Honeywell 1-Heat/1-Cool - TH5110D1022 Large R operating instructions manual online. ... 4. Press the Up or Down button to raise or lower the heat temperature setting. 5. "Select Heat/Cool" stops flashing six seconds after the last button press. ... Part 1. Replacement Battery Holder— Part number 50000951-001 Battery ...

4. Wait 15 Minutes: This sounds silly, but after a recent power outtage from a thunderstorm we found that our central AC wasn't kicking on. Our electronic thermostat was blinking "Cool On" which meant that the thermostat was, in theory, working, but the AC wasn't responding.Blinking "cool on" and no cold air being. 2 year old house, Pro series. Just today. 80 in the house. Replaced - Answered by a verified HVAC TechnicianCommon reasons behind wrong readings in your Honeywell thermostat are wrong location or calibration, sensor problems, outdated firmware, wiring issues, or old thermostats. To fix it, find the right location, recalibrate well, update the firmware, fix the sensor issues, and correct the wire connections. When your Honeywell thermostat shows ...Step 1. Change the Temperature. The first thing you can do if your thermostat display is on, but doesn't power on the HVAC system, is to adjust the temperature. So, first, try changing the temperature on your Honeywell thermostat. Also, make sure the desired temperature falls within the acceptable ranges.May 6, 2021 · The “Cool on” message on a Honeywell thermostat is also known as “delay mode”. It often flashes in the form of a blinking snowflake or as the word “wait’ as well. It’s a courtesy message to let you know that the AC will delay in coming on for approximately 5 minutes in order to protect your unit from short cycling which can cause ... Steps To Troubleshoot Issues With ‘Cool On’: Honeywell Thermostat. The ‘Cool On’ indicator flashing on your Honeywell thermostat should normally resolve itself within 5 minutes. However, if that does not happen, you can use the steps below to troubleshoot the issue and resolve the problem. Set Thermostat To Lowest Temperature SettingSystem 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 than 5 minutes. ... a hard reset as specified in your Honeywell thermostat manual. Inspect the Air Filters A very common issue that can cause the ...

Likely Explanation. Recommended Fix. 1. Honeywell AC Won’t Work. The wrong setting, dirty condenser coils, or a non-running fan. Set the thermostat on COOL, lower the temperature below room temperature, and set the fan on ON/Auto mode. Clean dirty coils and ensure the fan is running. 2.Step 1: Check Temperature Differential. To begin, press the “Menu” or “Settings” button on your Honeywell thermostat. Use the arrow keys or touchscreen to navigate to the temperature setting. Ensure your desired temperature is just a short distance from the current room temperature displayed on the thermostat’s screen.Apr 20, 2020 ... Honeywell thermostat hack. ... Honeywell thermostat hack. 190K views · 4 years ago ...more. Mike ... HVAC Thermostat Blinking Cool On But A/C Not ...Honeywell AC Troubleshooting . My thermostat is flashing "cool on" but not cooling the house. The AC fan is working when turned on. I checked the fuses and they're fine and the wiring is secure and in the right ports. Does anyone have any other tips for figuring out why it's not cooling? The unit was serviced a couple of weeks ago and ...The Honeywell Ac Thermostat Cool On Blinking Issue. Understanding the Honeywell AC Thermostat Cool on Blinking issue is crucial for maintaining optimal performance of your air conditioning unit. The blinking indicator on the thermostat serves as a warning signal and should not be ignored.I have a Honeywell thermostat. It is blinking cool on, but the AC never comes on. The heat does not come on either. I - Answered by a verified HVAC Technician. ... I have an AC system with a Honeywell 4000 thermostat. Dual zone system. The downstairs zone is not working, and the thermostat just keeps flashing cool. ...

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I have an AC system with a Honeywell 4000 thermostat. Dual zone system. The downstairs zone is not working, and the thermostat just keeps flashing cool. Upstairs zone is working fine, but the downstai … read moreThe 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 clean or replace your AC filter if it is clogged with debris.I have a multi-zone residential setup using the Honeywell Z311. When I call for the AC from the thermostat, the AC unit outside starts up and then stops after a minute or so. Sometimes shorter, sometimes longer. It's doing it on both zones. There is a flashing cool light on the honeywell z311 when this occurs. "Blinking when 45°F (7°C) DATS ...The Honeywell Ac Thermostat Cool On Blinking Issue. Understanding the Honeywell AC Thermostat Cool on Blinking issue is crucial for maintaining optimal performance of your air conditioning unit. The blinking indicator on the thermostat serves as a warning signal and should not be ignored.

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 ...Likely Explanation. Recommended Fix. 1. Honeywell AC Won’t Work. The wrong setting, dirty condenser coils, or a non-running fan. Set the thermostat on COOL, lower the temperature below room temperature, and set the fan on ON/Auto mode. Clean dirty coils and ensure the fan is running. 2.If you're live the Honeywell thermostat cool on lighting problem, where are some troubleshooting steps that able help. Readers diese blog post for more info. 914-666-9100From https://www.justanswer.com/ythiJustAnswer Customer: The yellow purge light is flashing on my honeywell zoning system.JustAnswer Customer: Can I reset it...I have honeywell portable air conditioner.the power button is not turning off.i see the ac is blowing cool air and when i try to turn in off ,the ac is not turning off and it still runs but does not b ... My Honeywell RTH2310B AC went out. The thermostat was blinking low battery, so I replaced them. It reset, but won't turn on.Allow the AC to cool down before restarting to prevent overheating. Check Power Supply. Verify the power supply is stable and the unit is well-connected. Preventing Blinking Red Light. Honeywell portable AC blinking red light can be an unsettling issue that disrupts your cooling experience.Verify your thermostat’s wiring. Check that the wires are connected securely to the terminals. Remember, the color of the wires only relates to the terminals they are connecting. Reference: The Y terminal on your thermostat controls the primary (1st stage) cooling. (Or the Y and O/B terminal if you have a heat pump system) In addition, the G ...Mar 7, 2024 · The blinking cool on your Honeywell thermostat indicates a potential issue with the cooling system, such as low refrigerant or a faulty compressor. Why Is My Honeywell Thermostat Showing A Blinking Cool But No Ac? If your Honeywell thermostat is showing a blinking cool but no AC, it could be due to a problem with the cooling system’s ... 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".

The same reset process applies to all Honeywell air purifiers. After cleaning or changing the filters, turn the unit on. To reset, press the PREFILTER button twice within one second and/or press and hold the CHECK FILTER for two seconds, until the red light turns off. The red light on a Honeywell air purifier indicates clogged filters ...

The filter can improve the system’s performance or cause extensive damage when clogged with a significant amount of dirt. If the Cool On indicator flashes on your Honeywell thermostat, turn the air conditioner off and inspect the filter. A clogged air filter restricts the airflow into and out of the system, causing a malfunction.Due to drained batteries, the heating or cooling feature of thermostats malfunctions. Go to your thermostat's display and see the battery level. Insert the batteries of the required voltage so that your thermostat performs well. Replacing the batteries can debug the Honeywell thermostat won't switch to cool. 4.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 …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 ...An improperly installed thermostat can result in various issues, including a blinking cool indicator without the cooling system functioning. Troubleshooting Steps. When your Honeywell thermostat is blinking cool on but not working, it can be frustrating. However, you can take several troubleshooting steps to try and resolve the issue.If your Honeywell Thermostat Vision Pro 8000 is having trouble, there are a few things you can do to troubleshoot the issue. First, check the batteries. If the batteries are low, they may need to be replaced. If the batteries are fine, then check the thermostat's settings. Make sure the thermostat is set to the correct mode (heating, cooling ...Reset the Thermostat. If your Honeywell thermostat is not cooling, resetting it may help resolve the issue. Here are the steps to reset your thermostat: Press the “Menu” button on your thermostat. Scroll down and select “Preferences.”. Select “Restore Factory Defaults.”. Confirm that you want to reset your thermostat to its factory ...The low refrigerant level is the most common reason the Honeywell HZ311 is showing a red light. It results in the HVAC system not being able to cool the air effectively, so warm air circulates throughout your home. In this case, the compressor will continue to work non-stop, trying to cool the air to the desired temperature, which, in the end ...Tighten Wiring Connections. Inspect wiring terminals on the thermostat and AC control board for looseness. Tighten all loose connections. 13. Cycle AC Unit Power. Turn off the power to the AC unit for 30 seconds, then turn it back on to reset the system and see if the "cool on" flashing light stops. 14.

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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 ...If you see a cool on blinking on your thermostat it means that there is fault in the thermostat wiring or the battery is dying. The Cool On message also appears on screen when AC gives a 5 minutes cooldown time to the compressor or if blower motor is not working properly. A dirty Air Filter can also be the reason for cool on blinking on thermostat.Ensure the thermostat is set to cool mode.Verify that the furnace door is securely closed and that the furnace's power switch is set to On.Make sure the furnace circuit breaker switches are on. In most cases, your thermostat turns on the compressor and fan (Y and G terminals/wires) during cooling.Reset the thermostat if needed.May 28, 2020 ... If your batteries need replacing the heat, AC and back light will not work. Here are some of the tools that Get It Done Home Repairs uses ...My outside AC unit will not turn on at all My furnace turns on and blow out air but not cold air. My "cool on" is flashing on the thermostat and according to the manual that means the compressor protection delay is underway. ... I have a Honeywell 9000 thermostat and two-year-old brand new AC system I live in Florida and the temperature has ...A Honeywell thermostat blinks "cool on" if the batteries are dying, the blower motor is bad, or the air filter is dirty. The message can also appear if the thermostat was improperly installed or if the wires are damaged. Honeywell thermostats also display a "cool on" message if the compressor needs 5 minutes to reset.Sends out cool air in heat mode. The system is not responding. ... Fixing blinking “Cool On” Light. If the ‘Cool On’ light is blinking, mostly it means that the system is kickstarting and the safety timer has been tripped to prevent the thermostat’s compressor from malfunctioning. ... Honeywell Thermostat Cool On Not Working: Easy Fix ...Check the filter for your air conditioner regularly. Most air filters should be replaced every six to 12 months. Check to make sure the air filter is clean and also installed correctly. If you see any potential issues, take the steps to fix them. This may mean buying a replacement air filter.The Honeywell 8000 thermostat is a popular choice for homeowners looking to upgrade their heating and cooling systems. With its sleek design and advanced features, this thermostat ...4 Manual Troubleshooting Techniques. 4.1 Step-by-step Guide For Manual Troubleshooting Of The Honeywell Hz311 System. 4.2 Identifying And Fixing Issues With The Reversing Valve. 4.3 Switching The System To Cooling Mode And Resolving Any Related Problems. 4.4 Fixing The Bypass In The Hz311 System.Verify the fan setting: Set the fan setting to “Auto.”. This ensures that the fan will turn on automatically when the cooling system is activated. Double-check the mode and time settings: Ensure that the thermostat is correctly programmed with the desired mode and time settings. Incorrect settings can cause the “Cool On” message to appear.Wait for at least 45 to 60 minutes to see if the cool air gets pumped out of your air conditioner. Low batteries The status of the battery in the thermostat plays a significant part in the blinking of the COOL ON indicator. If the batteries have low power, the thermostat won’t be able to detect the surrounding temperature. ….

If your Honeywell heater is overheating, it could be due to a dirty air filter or a faulty thermostat. Check and clean the air filter and ensure that the thermostat is set to the desired temperature. If the heater continues to overheat, it could be due to a faulty temperature control system. Best to contact an appliance repair person for help.Is you house HVAC thermostat blinking "cool on" or "heat on" and does not turn on the furnace or air conditioner? This is most often caused because power was...Troubleshooting guide: Why is your Honeywell thermostat flashing 'Cool on'? Get answers to fix HVAC issues fast... Check that all vents in your home are open and unobstructed. Move any objects that may be blocking the vents, such as furniture or curtains. After cleaning or replacing the filters and ensuring vents are open, turn your thermostat back on and set it to “cool.”. Wait a few moments to see if the air begins blowing. Honeywell Thermostat Troubleshooting Guide (2024 Update) Thermostats play a crucial role in setting the indoor temperature. While there are slight deviations between models, design, ease of installation, and maintenance are usually the main factors for most customers. Honeywell is a trusted brand known for its innovative and user-friendly devices.To determine if thermostat is the issue. remove wires from thermostat. Tie red, yellow and green together and see if unit will stay on. If so, problem is thermostat.If not we need to find what is causing the unit to shut down.It can be a pressure switch, float switch or issue with control board.If you're experiencing the Honeywell thermostat cool on flashing problem, at are some troubleshooting stepping that sack help. Read this blog post for more info. 914-666-9100The 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 ... Honeywell ac blinking cool on, 2/22/22. The thermostat has a feature called Adaptive Intelligent Recovery (AIR) or Smart Response or Early Start. This allows the thermostat to "learn" how long the heating and cooling system will take to reach the programmed temperature settings. So the temperature is reached at the time you set. For example: Set the Wake time to 6am, and the ..., Part 1 of the Honeywell AC guide helps keep your PAC working efficiently. A portable air conditioner (PAC) is one of the best cooling solutions for the coming summer months, providing powerful, refreshing relief on even the hottest days. ... Open doors or windows could be letting cool air escape, offsetting any cooling produced by your portable ..., If your Honeywell thermostat isn't displaying the cool option, it might be because you lack a cooling system like an air conditioner or a heat pump. Ensure you have an air conditioner installed. To troubleshoot, attempt setting your thermostat to defrost and observe if the condenser unit engages. If the outside condenser unit doesn't ..., The thermostat has a built-in compressor protection (minimum off timer) that prevents the compressor from restarting too early after a shutdown. The minimum off timer is activated after the compressor turns off. The thermostat keeps the compressor off for a few minutes before restarting, to prevent equipment damage., 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., The “Cool on” message on a Honeywell thermostat is also known as “delay mode”. It often flashes in the form of a blinking snowflake or as the word “wait’ as well. It’s a courtesy message to let you know that the AC will delay in coming on for approximately 5 minutes in order to protect your unit from short cycling which can cause ..., If the thermostat is blinking cool on but not working, this could indicate a power issue. Make sure to follow these steps to troubleshoot the problem and resolve it. Step 2: Check Thermostat Settings. When troubleshooting a Honeywell thermostat blinking cool on but not working issue, it is essential to check the thermostat settings., Honeywell Non-Programmable Thermostat Troubleshooting. If your Honeywell non-programmable thermostat is not working, first check the batteries and replace them if needed. Ensure the thermostat is set to the correct mode (heating or cooling). Verify the thermostat’s wiring is correctly connected., MN12CES&MN10CESWW_IM_Eng_USA_10. Read all instructions carefully before setting up and operating the unit. Keep this. instruction manual for future reference. This manual is designed to provide important. information needed to setup, operate, maintain and troubleshoot your portable air. conditioner., Problem with AC unit. I have the honeywell HZ322 controlling 3 zones using the honeywell focuspro th5000 thermostats. Downstairs which is on one's own doesn't respond to the thermostat keeps getting hotter and hotter and will not cool. Master bedroom on another zone keeps getting colder and colder with the thermostat turned off., 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 ..., 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 ..., To determine if thermostat is the issue. remove wires from thermostat. Tie red, yellow and green together and see if unit will stay on. If so, problem is thermostat.If not we need to find what is causing the unit to shut down.It can be a pressure switch, float switch or issue with control board., no circulating air, Honeywell hz311, in attic now and no lights on hz311 panel ... I have a Honeywell hz311 which has got a red zone 3 light and the cool light is blinking. The air handler is running but no air in house. I replaced the filter yesterday and it was really loaded and I ..., 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 …, 1-800-468-1502. Introduction. The Honeywell T6 Pro Z-Wave Programmable Thermostat is a Z-Wave Plus certified thermo-stat capable of controlling up to three heat and two cool stages of heat pump, (incl. dual fuel heat pump systems) and up to two heat and two cool stages of conventional system (3H/2C HP, 2H/2C Conv.), To help clean the system, you can add a small amount of vinegar to the water tank and run the air cooler in evaporative cooling mode for 15 to 30 minutes; then, drain the tank of the vinegar water and refill with fresh, clean water, running on evaporative cooling mode for another 15 to 30 minutes. This will help to break down the calcium deposits., , Curious about your Honeywell thermostat's blinking 'Cool On' indicator? Decode the signal, troubleshoot, and keep your cooling system in check effortlessly. ... Clogged or dirty air filters can hinder your HVAC system’s performance, potentially leading to longer cooling cycles. Regularly replace or clean air filters to improve efficiency., Typically, you will have a Honeywell thermostat flashing heat on in delay mode, but no heat coming through. If 5 minutes pass and the flashing message doesn't go away, you might need to restart your thermostat. You can do so by flipping off the power switch for 5-10 minutes and flipping it back on., 3) check the service disconnect switch, it's mounted on the side of the main unit in the basement, it's a normal looking switch. Sarah: k ill start with the breakers. brb. me: make sure no one messed with it, it should be on. 4) check the service access panel, it's the cover that faces the red couch., Honeywell pro series cool on blinking. If your Honeywell Pro series cool is blinking, it may be an indication that the system is not working properly. Here are some things to check: Make sure the power is on. Check the circuit breaker or fuse box to ensure that the power to the unit is not interrupted. Check the batteries., Resetting a Honeywell thermostat is simple and only takes a minute or two to complete. Either refer to your Honeywell control manual to reset it or follow the guide below that outl..., Common reasons behind wrong readings in your Honeywell thermostat are wrong location or calibration, sensor problems, outdated firmware, wiring issues, or old thermostats. To fix it, find the right location, recalibrate well, update the firmware, fix the sensor issues, and correct the wire connections. When your Honeywell thermostat shows ..., If the Honeywell Thermostat says “Cool On”, set the temperature to the absolute lowest setting. After that, just re-install the Honeywell software and see if that changes anything. Tech Support 24/7. Ask an Appliance Repairman Online. Connect with the Expert via email, text or phone. Include photos, documents, and more., Most Honeywell thermostats have a range of 60-90 degrees Fahrenheit. Once you have the temperature set, press the "hold" or "run" button to start cooling your home. The thermostat Blinking Cool On, But No Air . If your thermostat is blinking cool on, but no air is coming out, there are a few potential causes., 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 ..., Step 1. Change the Temperature. The first thing you can do if your thermostat display is on, but doesn't power on the HVAC system, is to adjust the temperature. So, first, try changing the temperature on your Honeywell thermostat. Also, make sure the desired temperature falls within the acceptable ranges., Small "snowflake icon is blinking and AC unit will not come on. I has shut off the power to all device sin order to let - Answered by a verified HVAC Technician ... Yesterday my AC unit was on for 10 hours and didn't cool a degree. So I checked it out, and here's what I found: 1. Outside unit was working, fan turning, but discharged air was not ..., One such issue is the “Cool On Blinking” error, which indicates a problem with the cooling system. 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., The filter can improve the system’s performance or cause extensive damage when clogged with a significant amount of dirt. If the Cool On indicator flashes on your Honeywell thermostat, turn the air conditioner off and inspect the filter. A clogged air filter restricts the airflow into and out of the system, causing a malfunction., 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.’., Jul 12, 2021 · 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.’.