Honeywell pro series flashing cool on

II. 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.

Honeywell pro series flashing cool on. 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 6000 Series: If your thermostat falls under the Honeywell 6000 Series category, make sure the thermostat is turned on. Then, press and hold the "Fan" button as well as the "Up" arrow. Hold these for about five seconds, then release them. Press the button on the bottom left until you see "39" on the display.

In this video, we show you a basic tutorial on how to replace batteries on a T6 Honeywell Thermostat Pro Series. Anytime you do this, make sure to unplug you...Honeywell News: This is the News-site for the company Honeywell on Markets Insider Indices Commodities Currencies StocksVerify that the thermostat is switched to cool mode and has a cooling set point below the room temperature reading. Check the thermostat display for cooling, usually indicated by the words “cool on” or a snowflake icon. If these icons are flashing, the thermostat is in delay mode, which can last up to 5 minutes.Sometimes, you might see the reading on the screen is blinking heat on. Generally, the Honeywell thermostat blinks for protection purposes. A blinking heat on signal indicates that a safety timer’s tripping that will protect the compressor of your thermostat. Sometimes, it might indicate a low battery.1 Honeywell Home T4 Pro Thermostat. 2 Other Honeywell Pro Thermostat Manuals: 2.1 User Guide. 2.2 Package Includes: 2.3 Thermostat controls. 2.4 Customer assistance. 2.5 System operation settings. 2.6 Fan operation settings. 2.7 Set the time and date.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 ...from 40 °F to 90 °F (4.5 °C to 32 °C), or set the cool from 50 °F to 99 °F (10 °C to 37 °C), you may have range-stops restricting your setting. Check with the installer to see if they set range-stops. "Cool On" or "Heat On" is flashing • Compressor protection feature is engaged. Wait 5 minutesFinal Thoughts. The reason why Honeywell thermostat blinking cool on is maybe the thermostat devices taking delay time to prevent the AC from short cycling. However, the cool on flashing may indicate that the AC is pumping cool air into your home. The blinking is supposed to go away within 5 minutes.

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.Nov 27, 2022 · 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. This Honeywell Home Support page offers steps to bypass the schedule on your TH2210DH, TH2110DH, TH2210DV, or TH2110DV. ... Pro 2000 Horizontal Programmable Thermostat Support; T6 Pro Smart Thermostat Support ... cool switch is set to the desired run mode. Remember, after you set the desired setpoint and select your desired hold the thermostat ...Use the up and down buttons on your Honeywell thermostat to adjust the temperature to warmer or cooler. Try not to go below 68 degrees if you are trying to set the temperature to be cooler than 70 degrees. Between 65 and 68 degrees is where you start to run the risk of frozen coils, short circuits and overheating.. The limiting menu will allow you to adjust the high-temperature limit and cool ...* 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. Wait 5 minutes for the system to restart safely, without damage to the compressor. Electrical Ratings. NOTE: Not for use with 250, 500, or 750 MV systems.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.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.

Are you using a Honeywell Pro Series thermostat or any of the Honeywell models that come with advanced settings? If you are, and your thermostat won't go above 70, then you can easily override the set maximum temperature and adjust it to your preferred comfort level. Read also: How to Override Honeywell Thermostat In a HotelSome 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.How to Change the Temperature on a Honeywell Thermostat. Hold the "Hold" button on the touch-screen display until "Permanent Hold" appears on the display. Touch the up or down arrows on the right side of the display to increase or decrease the target temperature. Wait while the heating or cooling works to achieve the temporary temperature setting.Hi, 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 low limit mode has been reached."4000. Series. Programmable Digital Thermostat. User Guide. Read and save these instructions. Your new thermostat is pre-programmed. Just set the time and day. For help please visit yourhome.honeywell.com Press to set desired temperature. Note: Set SYSTEMswitch to the system you want to control (Heat or Cool).

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Okay, 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 ...Honeywell PRO 1000 Series User Manual View and Read online. Est. reading time 4 minutes. PRO 1000 Series Thermostat manuals and instructions online. ... When "Heat On" or "Cool On" is flashing, compressor protection is engaged. Select the system setting * Model TH1110E1000 has a larger display than shown in image.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.Jul 8, 2023 · 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 Technician The fix. If your thermostat is flashing cool on, wait for 5 minutes until the delay is over. Usually the thermostat delay should not take more than 5 minutes. However, if your thermostat is not blowing cold air after the delay period, there could be issues causing this problem. Let’s go to the next step to find out more.

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.Last updated May 24, 2023. If your honeywell thermostat is not showing a cool option , that is because of an internal sensor. To fix the problem you’ll need to …If the screen of your Honeywell thermostat is blank, you should first check the furnace or air conditioner to be sure both are on and functioning properly. If the door to the furnace is open, for instance, the thermostat display may be blank. A fix could be as simple as closing the door of the furnace. You should also check the circuit breaker ...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 ...Honeywell 6000 series: When your device is 'ON,' press and hold the 'Fan' button followed by the 'Up' arrow button, hold these buttons for about 5 seconds before releasing. Press the button on the bottom left until the number on the display panel changes to '39'. Next, press the 'Down' arrow button until you see '0' and ...In this video I show you how to setup a schedule on the Honeywell Pro Series T4 Thermostat. I show you step by step how to program the time and temperature f...Jim Cramer says it's worth taking a look at shares of Honeywell, based on its updated guidance....HON Honeywell's (HON) stock is undervalued compared to other industrial compan...Hi, 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 low limit mode has been reached."

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.

View and Download Honeywell 1-Heat/1-Cool - TH5110D1022 Large R operating instructions manual online. Non-programmable Thermostat. 1-Heat/1-Cool - TH5110D1022 Large R thermostat pdf manual download. Also for: Th5110d, Focuspro 5000, Th5100d1007/u.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 …Sometimes, you might see the reading on the screen is blinking heat on. Generally, the Honeywell thermostat blinks for protection purposes. A blinking heat on signal indicates that a safety timer's tripping that will protect the compressor of your thermostat. Sometimes, it might indicate a low battery.2/22/22. When you are in Auto Change Over mode, the display will say either "auto heat" or "auto cool" to the left of the room temperature. If you are trying to change the heat setting when the display says "auto heat", or trying to change the cool setting when it says "auto cool", simply press the + or - button. If you want ...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 …Power outage or any interruptions in the power cause the thermostat to automatically switch to the setup mode. This is also one of the reasons why you find your Honeywell thermostat flashing cool on. Keep an eye on the clock and review all the settings accordingly. 3. Check Whether the Batteries Are Working.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.Works with Your Favorites. Connected to your existing WiFi, the T6 Pro Smart Thermostat is already part of the family. Integration with your Apple HomeKit and Amazon Echo lets you adjust your temperatures as easily as you change songs on your playlist. This thermostat also works with your heating systems stages, up to 3 Heat/2 Cool with heat pump.

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View and Download Honeywell TH8321WF1001 user manual online. TH8321WF1001 thermostat pdf manual download. Also for: Th8321wf1001u, Wi-fi visionpro 8000 series.Summary of Contents for Honeywell Home T6 Pro. Page 1 T6 Pro Programmable Thermostat User Guide – Package Includes: • T6 Pro Thermostat • UWP™ Mounting System • Decorative Cover Plate TH6320U2008, • Screws and Anchors TH6220U2000, • 2 AA Batteries TH6210U2001, • Thermostat Literature Read before installing Thermostat …A 'cool on' message will be flashing on your Honeywell thermostat, in case the system is in delay mode or if the batteries need to be changed; simply wait for 5 minutes or change the batteries and the message will disappear. If the message stays, try resetting the device.Testing a Honeywell Thermostat. If the thermostat LED is lit, do a test by turning the thermostat to its maximum setting (in HEAT mode) or minimum setting (in COOL mode), turning the main control to AUTO or FAN and waiting for the blower to start. If it doesn't, remove the thermostat cover and check the wiring. 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 ... Jul 8, 2023 · 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 Technician La boîte comprend : Thermostat T4 Pro. Système de montage UWPTM. Adaptateur d'installation standard Honeywell (adaptateur boîtier de raccordement) Plaque de couvercle décorative Honeywell - Petite; dimension 4-49/64 po x 4-49/64 po x 11/32 po (121 mm x 121 mm x 9 mm) Vis et chevilles. 2 piles AA.Cool: Thermostat controls only the cooling system. Off: Heating and cooling systems are off. Auto: Thermostat automatically selects heating or cooling depending on the indoor temperature. Em Heat (only for heat pumps with auxiliary heat): Thermostat controls Emergency and Auxiliary Heat.Cool on indicator flashing on Honeywell thermostat I have a honeywell pro th4000 series system. the cool on indicator is flashing. I have followed the instructions in the operating manual, however, it still keeps flashing.Make sure power switch at heating & cooling system is on. Make sure furnace door is closed securely. Wait 5 minutes for the system to respond. Make sure heating and cooling temperatures are set to acceptable ranges: Heat: 40° to 90°F (4.5° to 32°C). Cool: 50° to 99°F (10° to 37°C). Compressor protection feature is engaged. ….

POPULAR VIDEOS. How to properly remove an old thermostat for replacement. Modal 1. How to properly mount and wire the sub-base for the Honeywell Home RTH221B thermostat - Resideo. Modal 1.The screen shows cool on- solid not blinking. Fan on is displayed temperature is - Answered by a verified HVAC Technician. We use cookies to give you the best possible experience on our website. ... I have a honeywell pro th4000 series system. the cool on indicator is flashing. I have followed the instructions in the operating …Honeywell Home Pro Series Model TH6220WF2006. 2 YEARS OLD. 1 of 2 units has a blank screen, other working. I am trying to read comments on same issue with same model herein. ... I have a honeywell pro th4000 series system. the cool on indicator is flashing. I have followed the instructions in the operating manual, however, it still …or call Honeywell Customer Care toll-free at 1-800-468-1502. This manual covers the following models: TH5110D:For 1 Heat/1 Cool systems. TH5220D:For up to 2 Heat/2 Cool systems. TH5320U:For up to 3 Heat/2 Cool systems. MCR29404(Remove battery holder to find model number) FocusPRO. ®TH5000 Series 1 69-1923EFS—01. ENGLISH.The Honeywell thermostats 4000 series. 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.Please try again. Check the name or model number of your product to ensure it's correctly written in the search bar above. If you're looking for a product that isn't a thermostat, try checking here.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 ...The fix. If your thermostat is flashing cool on, wait for 5 minutes until the delay is over. Usually the thermostat delay should not take more than 5 minutes. However, if your thermostat is not blowing cold air after the delay period, there could be issues causing this problem. Let’s go to the next step to find out more.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.1-48 of 129 results for "Honeywell Pro Series Thermostat" Results. Check each product page for other buying options. Honeywell. TH4110U2005/U T4 Pro Program Mable Thermostat, White. ... TH6220U2000/U T6 Pro Programmable Thermostat, 2 Heat / 1 Cool Heat Pump Or 2 Heat / 2 Cool Conventional, 2.27" x 6" x 5", White, Model:ITBD-3570150. 4.2 out of ... Honeywell pro series flashing cool on, 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., 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., 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, PRO. 4000. Press to set desired temperature. Note: Set SYSTEM switch to the system you want. to control (Heat or Cool). Set: Sets time/day/schedule. Hold: Overrides programmed temperature. Run: Resumes program schedule. System switch is used to control your heating., Change the batteries. Replace air filters. Check the furnace door/power switch. Inspect air conditioner coils. Replace the thermostat. Call in an HVAC specialist. Honeywell thermostat set to cool but heating. Confirm the thermostat is set up properly. Lower the temperature on the thermostat., A ‘cool on’ message will be flashing on your Honeywell thermostat, in case the system is in delay mode or if the batteries need to be changed; simply wait for 5 minutes or change the batteries and the message will disappear. If the message stays, try resetting the device., Turn on the power to the system and the thermostat by flipping the circuit breaker or the disconnect switch to the ON position. Check the thermostat and the system and see if they work properly. Make sure the thermostat is set to the correct mode and temperature and the system is not flashing heat on anymore., Okay, 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 ..., 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., Turn on the power to the system and the thermostat by flipping the circuit breaker or the disconnect switch to the ON position. Check the thermostat and the system and see if they work properly. Make sure the thermostat is set to the correct mode and temperature and the system is not flashing heat on anymore., 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., To check your air conditioner, switch it to "COOL," and make sure the fan is set on AUTO. Turn it down to around 60 degrees and wait five minutes. ... Troubleshooting a Honeywell smart thermostat is similar to a programmable one, so you can follow many of the same steps. Also, the great thing about smart thermostats is that generally, if ..., Sometimes, a simple reset of the thermostat settings can resolve battery-related issues. To reset the settings of your Honeywell Pro Series Thermostat, follow these steps: Press and hold the "Reset" button: Locate the "Reset" button on your thermostat. It is usually located at the bottom or back of the device., 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., 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..., 2) You have a conventional heating system. Another reason a honeywell thermostat will not display the cool option is that you don’t have a cooling system such as an air conditioner or a heat pump. Be sure that you have an air conditioner. You can try setting your thermostat to defrost and check if the condenser unit will engage., To set a Honeywell thermostat for your AC, start by setting the temperature you want the room to be. Then press 'SET' and use the arrows keys to adjust either up or down until it reaches your desired temperature. Next, press 'RUN'. This will activate the AC in order to reach that temperature. To turn off the AC completely, press 'OFF'., 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. ..., In that case, you'll just have to set the temperature, and then press the key under "Hold" to activate the "Temporary Hold" feature. Again, depending on what model Honeywell thermostat you're using, the steps you should take may vary. For example, the latest programmable thermostat Honeywell, the Honeywell ZStat Z-Wave Thermostat ..., Select the Menu and press Schedule . Choose the period you want to set the thermostat for. Adjust using the plus or minus icon. Tap the Temperature tab and choose the heating or cooling temperature you want. Press the Select tab until it says " Done .". Press the Select tab again to save the new temperature. You can easily adjust your phone ..., 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., PRO 1000 HORIZONTAL NON-PROGRAMMABLE THERMOSTAT Manual & Support. TH1210DH1001/U, TH1100DH1004/U, TH1110DH1003/U. Download Manual Download Installation Guide. Download Service Datasheet. PRO 1000 HORIZONTAL NON-PROGRAMMABLE THERMOSTAT Product Page., Thermostat Honeywell PRO 2000 Series Operating Manual. Pro 2000 series programmable thermostat (72 pages) Thermostat Honeywell Wi-Fi VisionPRO 8000 Installation Manual ... Check Receiver Box has power by pressing Thermostat is flashing the button to switch boiler on. Page 22 Country of origin : UK ©2019 Resideo Technologies, Inc. All rights ..., Bot***** ***** light on right is flashing Customer attachment 6/9/2021 1:32:04 AM. ... I have an vision PRO TH8000 series Honeywell thermostat and Ineednto know how to turn on emergency heat only ... what is the red light at the top right corner of the vision pro 3 heat/ 2 Cool stat mean when it is used with a 2 stage heat pump with electric ..., Honeywell warranties cover defective products, but for how long? Learn about the best ways to protect your home beyond what a Honeywell warranty protects. Expert Advice On Improvin..., Oct 4, 2023 · The blinking “Cool On” light on your Honeywell Pro Series thermostat serves as a warning sign that there is an issue with your cooling system. It acts as a visual cue to draw your attention to the fact that your HVAC system is not functioning as it should. While it may be alarming to see the light blinking, it’s important not to panic. , Honeywell Home TH6220U2000 - T6 Pro Programmable Thermostat, 2H/1C Heat Pump, 2H/2C Conventional- The T Series programmable thermostat streamlines everything from product selection and installation to customer service and support. With a standard footprint and simple interface, the T Series will enhance the entire thermostat experience for you and your customers alike<br> <br><b>Package ..., 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., 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 Technician, 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., Page 1: Thermostat Controls. Turn thermostat over, insert fresh AA alkaline batteries, then reinstall Product Manuals thermostat. Search online for Honeywell 69-1929EFS for the Installation Guide. Search online for Honeywell 69-1776EFS for the User Guide. 33-00300EFS-01..., Step 1 – Set to Thermostat’s Lowest Temperature Setting. When troubleshooting your thermostat’s “cool on,” the best way to start is by setting the temperature at the lowest setting. Check to see whether the thermostat can control the temperature, and if not, try modifying the controller settings., Learn why the "Cool on," "Heat on," "Snowflake," or "Flame" is blinking on your thermostat device at the Honeywell Home Support and Resource Center.