Honeywell thermostat pro series cool on flashing

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.

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.Resetting your T5 Thermostat is an easy process that can be done in a few simple steps. First, locate the reset button on the thermostat. This will usually be located near the face of the thermostat or somewhere along its sides. Once you have identified this button, press and hold it for 10 seconds until you hear a clicking sound.About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...Wait 5-10 minutes. Your thermostat could be facing a slight delay in restarting and activating …If so, your thermostat may go into setup mode that can result in blinking Cool on indicator. You may also check and reconfigure the clock settings to make it set accordingly. Inspect the indoor AC filter. In theory, it is recommended to change the AC filter approximately once every three months. A dirty or clogged filter will make any unit to ...The fan symbol on a Honeywell thermostat represents the fan mode. It indicates whether the fan is set to "auto" or "on" mode. If the fan symbol is illuminated, it means that the fan is set to the "on" mode and will run continuously, even when the temperature is not being regulated. If the fan symbol is not illuminated, it means that ...

1-Week Programmable Thermostat Support; 5-2 Day Programmable Thermostat Support; Single-stage Programmable Thermostat Support; Pro 2000 Horizontal Programmable Thermostat Support; T6 Pro Smart Thermostat Support; T5/T5+ Smart Thermostat SupportShare This Guide. 8 Reasons for Your Honeywell Thermostat Not Cooling. 1) Thermostat Not Set to Cool Mode. 2) Furnace Door Not Closed. 3) Furnace Circuit Breakers. 4) Issues With Thermostat Wiring. 5) Thermostat Not Correctly Configured. 6) Malfunctioning Reverse Valve. 7) Low Thermostat Batteries.Hi we have a pro series Honeywell thermostat. It has be on the cool mode for months and I am trying to get the heat on. The screen does not show a mode. Under the temp it just says unlock and pressing the buttons only gives the home button but no choices. Contractor's Assistant: I understand that you're having trouble switching your Honeywell ...How to enable Auto mode on their Honeywell T6 Pro thermostat: How to turn on Auto Change in Honeywell ProSeries Thermostat. 1.Access the advanced settings menu (option 300). 2.Locate the setting that enables Auto mode. 3.Once enabled, use the Mode button on the thermostat to set it to Auto mode.Read also: Honeywell Thermostat Flashing “Cool On” [7 Easy Fixes] 5. Furnace Ignition Problems. If you use a furnace for heating and your Honeywell thermostat says heat on but no heat coming through, there could be problems with your furnace ignition. Some issues that prevent your furnace from igniting include. Closed gas …What does the blinking Cool Dwn mean on the thermostat, Thanks for the help, just for the last hour, it's about 5 years - Answered by a verified HVAC Technician. ... Just for the last hour, it's about 5 years old and it's a Honeywell pro series. Contractor's Assistant: ...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.The new Honeywell T Series Programmable Thermostat has stages up to 1 Heat/1 Cool for conventional systems and 2 Heat/1 Cool for heat pumps.Features7-day, 5-2, 5-1-1 or non-programmableOn-screen menus with familiar installer setup (ISU) stepsUWP mounting.

I have a Honeywell home pro series, the cool on is flashing but the ac will not come on. ... I need a QR code to connect my Honeywell pro-series thermostat to apple mini HomePod. Thank you. ... I replaced the batteries to my Honeywell T4 Pro. The "cool on" is blinking in the upper right hand corner of the thermostat, the air does not come on. ...In summary, when faced with the Honeywell Pro Series Cool On Blinking issue, it is essential to check the power source, perform a thermostat reset, and adjust the fan settings. By following these possible , you can troubleshoot and resolve the blinking light problem, restoring the proper functionality of your Honeywell Pro Series thermostat.Now, let's dive into the step-by-step process of removing the cover on your Honeywell Pro Series thermostat: 1. Turn off Power. Begin by turning off the power to your HVAC system. Locate the circuit breaker or the power switch dedicated to your heating and cooling system and switch it off. This step is crucial for your safety and avoids any ...Honeywell TH6320U2008 T6 Pro Series 3 Heat/2 Cool Programmable Thermostat OPEN. lucky7market (6127) 99.9% positive; Seller's other items Seller's other items; Contact seller; US $27.99. Condition: Used Used. ... So much easier to use than old Honeywell thermostat. Verified purchase: Yes Condition: New Sold by: jhmen_25. by jeremthacke2. Feb 17 ...If it is enabled, just press the ‘disable recovery mode’ option. 2. Monitor the results. Give your Honeywell thermostat around a day to see if the recovery mode turns on. Likely, this should not worry you. If that period of the day ends and the thermostat switches into recovery mode, there is something wrong. 3.

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If you own a Honeywell Pro Series thermostat, it’s essential to familiarize yourself with the user manual. The Honeywell Pro Series manual is a comprehensive guide that provides de...Honeywell Thermostats. If you have a blinking or flashing snowflake on your Honeywell thermostat, or the word heat/cool is blinking, it means your thermostat is in delay mode. Your system should cycle on in five minutes but check the possible causes above for delay mode. Check for possible causes if your thermostat is in delay mode.Est. reading time 8 minutes. FocusPRO 6000 Series Thermostat manuals and instructions online. Download Honeywell FocusPRO 6000 Series PDF manual. ... 9.4 "Cool On" or "Heat On" is flashing; 9.5 To restore default settings; 10 5-year limited ... Honeywell T10 PRO Smart Thermostat Installation Guide (article) Honeywell Programmable …Hello, I have a Honeywell EIM with a TH6320R 1004 Thermostat. The Thermostat shows cool on blinking. No fan, no compressor. Note: I had waited 5-10 minutes since power-up. Thanks for your advice and i … read morePage 1: Operating Manual. Operating Manual Mode d'emploi Manual de Uso PRO 2000 Série Series Programmable Thermostats Thermostats programmables Termostatos programables... Page 3 To prevent possible compressor damage, do not use Cooling mode when the outdoor temperature is below 50 °F (10 °C).

If your thermostat is in delay mode, the following messages and icons will be flashing on your thermostat display: "Wait" or "waiting for equipment" "Heat" or "Heat on" Fire Icon; Sun Icon; If you see any of the above messages or icons flashing or blinking quickly, then compressor protection is on for your heat pump.The Honeywell AC thermostat cool on blinking issue can be resolved through a series of troubleshooting steps. Start by inspecting the thermostat wiring for any potential issues. Start by inspecting the thermostat wiring for any potential issues.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.'.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...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 ...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.The cool on is blinking but ac not on, pro series 1-2 years old, it was off to - Answered by a verified HVAC Technician. We use cookies to give you the best possible experience on our website. ... My honeywell thermostat quit working, like it was turned off. I replaced the batteries.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 ...Second Opinion] Trying to replace a Honewell thermostat (honeywell th3110d1008) with a new Honeywell T9 Smart one. Old thermostat was cooling only, R, G, Y wires, no C wire (batteries). Jumper between …To set the Honeywell thermostat temperature to cool, follow these steps: Switch to Cool mode by pressing the System button on the thermostat, the Mode icon on the touchscreen, the System icon on the app, or saying a voice command, such as Set the system to cool. Adjust the desired cool temperature by using the up and down arrows on the ...

SIMPLE TO THE TOUCH. Looking for a traditional, easy-to-use thermostat, install the inexpensive PRO 1000 Vertical Non-Programmable Thermostat. You will appreciate the backlit digital display and the reliable basic operation of the slide switch to select heat, cool or fan. SELECT A MODEL: PRO 1000 Vertical Non-Programmable Thermostat.

How to unlock a Honeywell pro series thermostat that's locked. TH6220u2000. We tried resetting it with changing the - Answered by a verified HVAC TechnicianStep 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.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 ...If you also want to turn off recovery mode on your Honeywell thermostat, you have two options: You can override recovery mode temporarily by manually adjusting the temperature on the thermostat . This will cancel the current recovery mode and resume the normal operation of your thermostat.If Heat On or Cool On is flashing, compressor protection is engaged. Pull at bottom to remove thermostat from wallplate. Turn thermostat over, insert fresh AA alkaline batteries, then reinstall thermostat. Cool On 75Inside 75Set To Message flashes until safe restart time has elapsed. 33-00300EFS-05 Input: 24 V~ @ 60 Hz, 1.0 A Electrical RatingsView and Download Honeywell PRO TH3000 Series operating manual online. ... (Heat/Cool) PRO TH3110D / TH3210D System switch The SYSTEM switch can be set to control your heating or cooling system, depending on the season. ... Install fresh batteries when the REPLACE BATT warning begins flashing. The Turn thermostat over, insert fresh AA warning ...Return mode starts flashing whenever the Honeywell thermostat is preparing in advance for the "Return" or "Home" schedule periods. ... PRO 4000 and RTH 2300 Series. Programmable thermostats. Schedule Mode: 5+2; ... 10 Steps to Fix a Honeywell Thermostat Flashing Cool On or Heat On. Disclaimer: You are responsible for your own safety. ...The best Honeywell thermostats with fan circulate mode include the T6 Pro Smart thermostat, WIFI 9000 color touchscreen thermostat and VisionPro 8000 series. Not all Honeywell thermostats come with the circ setting feature, there are only select models and the following Honeywell thermostats do have the fan circulate mode and are worth ...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.

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Final 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. Honeywell Thermostat Flashing “Cool On” Basics. A Honeywell thermostat is a user-friendly device designed to control and regulates indoor temperature settings in homes and businesses. It helps maintain comfortable and energy-efficient environments by allowing users to customize heating and cooling systems.Honeywell Home TH2110DH1002 - PRO 2000 Horizontal Programmable Thermostat (1 Heat/1 Cool)- Overview: The PRO programmable family of thermostats provides basic and simple programming with specific models for conventional and heat pump systems. Features: Weekday/Weekend programming - 5-2 (Weekdays, Weekend) programming. ... 70 Series Programmable ...Keep in mind that the restart process may slightly differ between various thermostat models. If you want to find the exact steps for your specific Honeywell thermostat, don't forget to refer to our list of collated Honeywell user manuals. Step 3: Reset Wi-Fi Settings on the Thermostat. Try resetting the Wi-Fi settings on your thermostat.View and Download Honeywell Home T4 Pro Series manual online. Programmable Thermostat. T4 Pro Series thermostat pdf manual download. Also for: Th4110u2005, Th4210u2002. ... Press Select to enter System Test. 3 Use to change between Heat, Cool, Fan, Em. Page 18: Troubleshooting Troubleshooting If you have difficulty with your thermostat, please ...How to set Honeywell thermostat to cool. Answer: If you wish to make your house cooler, you must manually adjust the Honeywell thermostat's temperature. To turn the fan on or off, press the "Fan" button. Then, to place the thermostat in Heat, Cool, or Off mode, hit the "System" button. Push the button one more to alter the setting.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.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... Heat and cool settings must be at least 3 degrees apart. The thermostat will automatically adjust settings to maintain this 3-degree separation (called "deadband"). The 3-degree separation between heating and cooling set temperatures is fixed, and cannot be changed. Press system button until screen displays "Auto". Follow in these steps. Step 1. Go to the thermostat configuration and enter the correct system type and change the reversing valve setting. Step 2. Remove the thermostat cover from the wall and don't forget to take a snap of the current wiring (you may need to restore your wiring to the current one.) Step 3.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 ….

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.Luckily this is an easy enough thing to fix. All you need to do is change the batteries in the thermostat. Take a look at the display to see if the "battery low" light is flashing. As soon as your thermostat starts to display this warning, you normally have around 2 months before the power will start to fail.Is the “Cool On” message solid (not blinking) on the thermostat display? Verify your thermostat’s wiring. Check that the wires are connected securely to the terminals. …If the high limit switch is open due to overheating, it can cause the your Honeywell thermostat to flash "Heat On". Troubleshooting will typically involve checking the high limit switch to ensure it is not tripped or stuck in the open position. If it is, allow the furnace to cool down and then reset the switch.A programmable thermostat saves energy by automatically raising and lowering the temperature of your home while you’re away. Watch this video to learn more. Expert Advice On Improv...A loose wire is one of the common reasons behind the Honeywell thermostat blinking the HEAT ON. When the thermostat blinks the HEAT ON, your device is in a 5-minute delay to give you heat. But more than 5 minutes is abnormal. The device increases the delay when the wires are loose and fail to signal your HVAC properly.CLICK LINKS BELOW FOR ITEMS IN/RELATED TO VIDEO🍒 Here's my thermostat https://amzn.to/3cMWO9X🍒 Upgrade to this one? https://amzn.to/3Sc8L9v🍒 This one al...Aspect 4: Check whether you've installed the batteries correctly. If you've tested the batteries in other household devices and the batteries have worked in every device except the thermostat, you might have installed the batteries incorrectly. Put the batteries back again after you've verified the orientation they should be in.Unlocking Solutions Honeywell Thermostat Pro Series Not Cooling Key Takeaways. Unlock solutions for a Honeywell Thermostat Pro Series not cooling. 🌡️ Here are essential insights: 1. Check Your Settings: Ensure your thermostat is set to the cooling mode and the desired temperature. Sometimes, a simple adjustment can make a big difference. 2. Honeywell thermostat pro series cool on flashing, Scenario 5: Specific Model Issues (e.g., Honeywell Pro Series) Honeywell's Pro Series and other specialized thermostat lines have unique troubleshooting considerations: Consult Model Manual: Honeywell has produced many thermostat models over the years. Review your specific version's troubleshooting guidance., Honeywell Home Pro Series Model TH6220WF2006. 2 YEARS OLD. 1 of 2 units has a blank screen, other working. ... We have two Honeywell RTH7000 series thermostats. Today when we came home, both screens were blank. ... I have a honeywell pro th4000 series system. the cool on indicator is flashing. I have followed the …, Smart Response Learning. The T6 Pro 7-Day Programmable Thermostat learns your heating and cooling cycle times to deliver the right temperature when you want it. With precise temperature control, the thermostat can automatically change from heating to cooling to help maintain the temperature you like most. Intuitive Design., This Honeywell Home PRO 3000 Non-Programmable Thermostat from Resideo offers basic operation such as a slide switch for selecting heat, cool, or operate the fan. The backlit digital display makes temperature and settings easier to read in various lighting conditions. SELECT A MODEL: PRO 3000 1 Heat/1 Cool Non-Programmable Digital Thermostat., 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 ... , 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., 1. Verify the thermostat is wired correctly. 2. Make sure the thermostat is configured correctly for the heating/cooling system type. 3. Verify the wiring is connected correctly and securely to the thermostat. If the above information has been verified and the issue is still present, contact a HVAC professional., The thermostat then turns on the heating or cooling at just the right time to reach your scheduled temperature at your scheduled time. For example: Set the Wake time to 6 am and the temperature to 70°. The heat will come on before 6 am, so the temperature is 70° by the time you wake at 6., 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., Second Opinion] Trying to replace a Honewell thermostat (honeywell th3110d1008) with a new Honeywell T9 Smart one. Old thermostat was cooling only, R, G, Y wires, no C wire (batteries). Jumper between …, Heat and cool settings must be at least 3 degrees apart. The thermostat will automatically adjust settings to maintain this 3-degree separation (called "deadband"). The 3-degree separation between heating and cooling set temperatures is fixed, and cannot be changed. Press system button until screen displays "Auto"., On the upper right it saying Cool On. Contractor's Assistant: Do you know the model of your Honeywell thermostat? How old is it? I don't know the model. The house is two years old. Contractor's Assistant: The HVAC Technician can help you find the model number for your thermostat; I'll connect you shortly. How long has this been going on with ..., If you're experiencing the Honeywell thermostat dispassionate on flashing issue, it are some troubleshooting steps that can help. Read this blog publish for more info. 914-666-9100, To fix this issue, press and hold the Connect button on the wireless sensor for about 15 minutes. Wait for the LED to turn Amber. Next, return to your thermostat menu and press Menu, Devices, and then Sensors. Follow the instructions on the screen to add the sensor. This should fix the problem., Easy Fixes for the "Cool On" Flashing Issue. Now that we have identified the potential causes, let's explore seven easy fixes to resolve the "Cool On" flashing issue with your Honeywell thermostat: 1. Check Thermostat Settings: Ensure that the thermostat is set to the correct mode (cooling mode)., 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 Honeywell Home PRO 3000 Non-Programmable Thermostat from Resideo offers basic operation such as a slide switch for selecting heat, cool, or operate the fan. The backlit digital display makes temperature and settings easier to read in various lighting conditions. SELECT A MODEL: PRO 3000 1 Heat/1 Cool Non-Programmable Digital …, Resetting Honeywell Smart/Lyric Round Thermostat. Step 1: Press the Cloud Icon and hold it. Step 2: Press the Down Arrow button until Reset appears on the screen. Step 3: Select Reset to complete factory reset. Now your device has been successfully reset to factory default settings., 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 make this thermostat from Resideo one of the best choices in temperature control on the market. SELECT A MODEL: T1 Pro Non-Programmable Thermostat - 24 Vac., CALL US. Speak directly with an agent for help with our products. Honeywell Home Support gives steps to adjust screen brightness on a TH6110D1005, TH6220DXXXXX, or TH6320U100 thermostat., 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., Honeywell Thermostat Flashing "Cool On" Basics. A Honeywell thermostat is a user-friendly device designed to control and regulates indoor temperature settings in homes and businesses. It helps maintain comfortable and energy-efficient environments by allowing users to customize heating and cooling systems., Reset procedures vary widely depending on the model of the Honeywell thermostat, but they include pressing System to reconfigure the settings or temporarily inserting the batteries..., 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., The blinking "Cool On" message on a Honeywell thermostat display indicates that the system is restarting, batteries need replacing in the control panel, or a fault with the system. If the blinking persists for more than five minutes, contact a technician to perform diagnostics. The "Cool On" indicator message on a Honeywell thermostat ..., 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 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., Is the “Cool On” message solid (not blinking) on the thermostat display? Verify your thermostat’s wiring. Check that the wires are connected securely to the terminals. …, Adaptive Intelligent Recovery:The T6 Pro Smart thermostat learns your heating and cooling cycle times to make sure the system delivers the temperature you want, when you want it. 4. Mode. Touch to select system mode: • Auto (if enabled) • Heat • Cool • Off • Em Heat (Emergency Heat) Menu., How to lock Honeywell 6000 thermostat. Go to "Up" and "Down" buttons to the right of the LCD display on your Honeywell thermostat. Tap "Up" and "Down" until you get to the desired temperature on the display. Press the button beneath "Hold" on the LCD display. "Permanent Hold" will appear on the screen. Your thermostat is ..., 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 …, 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., TH2110DV: For 1 Heat/1 Cool systems. TH2210DV: For 2 Heat/1 Cool heat pump systems only. (Pull thermostat from wallplate and turn over to find model number.) CAUTION: EQUIPMENT DAMAGE HAZARD. To prevent possible compressor damage, do not operate cooling system when outdoor temperature is below 50°F (10°C).