If you have problems with the 24-volt low voltage system calling an HVAC contractor is best. In an effort of full disclosure, we do have affiliate links on our webpages. Additionally, furnace breakers trip also for various reasons that may not be related at all to your thermostat. It is mandatory to procure user consent prior to running these cookies on your website. Replace batt air conditioner if central air thermostat not working. It would help if you also looked everything over to make sure that it’s clean. This product requires professional installation so it will turn on and off with the blower fan in your air handler but it will offer the protection you need for you and your family from any viruses. What do you do when the thermostat screen is not working? It depends on what type of HVAC system you have. If your previous thermostat did not use a C wire, it's unlikely that it is connected at the equipment. How to change battery in Honeywell thermostat cool on but not working ac. Just bought my wife a new thermostat for our house. These cookies do not store any personal information. Then carefully remove the cover, after turning the thermostat off, and check the wiring inside. Most of the modern thermostats today use the power stealing technology. ... • If trying to connect to a hidden or manually added network, confirm the router has power and is working. Please use our contact page to connect with us. And in this case, you can see the thermostat screen not responding. *If you are located in Southern California we may be able to help you. To begin tap “Start Setup” on your thermostat. Your email address will not be published. Neither heat nor cooling will come on. The sensor can be replaced, or you may need to replace the whole thermostat. 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 your thermostat's Wi-Fi isn't working, the solution depends on what you're experiencing. But what happens when the display is not there, or there is a blank thermostat display or no display on the thermostat? This was in use until recently. Verify the furnace / air handler door is closed, the power switch is on, and the breakers are on. A Honeywell thermostat may be malfunctioning generally, and this is the cause of its inability to hold temperature. How to Fix a Blank Honeywell Thermostat. Central heating problems can often be down to a broken thermostat that won’t work. Another common issue for not having a display on your Honeywell thermostat is because the circuit breaker may have been tripped. Any … read more When it’s not functioning properly, you could be faced with severe heating and cooling issues that not only affect the comfort of your home but your wallet as well. Its possible you blew a low voltage fuse. Before becoming vice president, he worked six years in the field as a service technician and has over ten years of experience working in the industry. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. You can be assured there will be no further problems with the HVAC equipment or the display. I replaced the batteries on my Honeywell, and settings show up until I place it on the receptacle. Read Also : How to reset honeywell thermostat If the door to the furnace is open, for instance, the thermostat display may be blank. ... “Our AC was not working in the 90-degree summer heat. One of the most common issues with digital thermostats is that there is no display. We'll assume you're ok with this, but you can opt-out if you wish. The next step you will want to turn the electrical breaker off that controls the unit first. If you get no light and no change at all to the display your thermostat will need to be replaced. Power stealing thermostats get their power from the transformer. You also have the option to opt-out of these cookies. Billy Henley is the Vice President of Operations for BHI Plumbing, Heating & Air Conditioning. In many cases, you can troubleshoot the problem and fix it. If all else fails, bite the bullet and open it up. Furthermore, if you reset the breaker and it trips again, you have a serious problem and need to consult an HVAC contractor. To operate heating, the thermostat requires power to the R terminal. Thermostat Screen not Working - First, we need to distinguish between the different types of thermostats available on the market. Test the Settings on Your Analog Honeywell Thermostat If you have an analog Honeywell thermostat and it isn’t functioning correctly, test the settings. I don’t know what to do , please give me some suggestions. My Honeywell Chronotherm III thermostat is not working. We have serviced the Inland Empire communities for more than 36-years now. Gas Heating Troubleshooting and Repair Index, Blank Display on Thermostat Problem – Types of Thermostats, Power Check – Blank Display on Thermostat Problem, Modern Thermostats | Blank Display on Thermostat Problem, Conclusion | Thermostat Screen not Working, Questions From Our Readers | Blank Display on Thermostat Problem. Rinse and repeat if the first attempt doesn't have the desired effect. — thermostat connections at the two C terminals. Other types of thermostats will not tell you when to replace the batteries. Contact Support at 1-855-733-5465 to find a pro-installer in your area. Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. I have changed the batteries and checked all the settings, but the display shows the time, then -AC. Furthermore, they have the skills to figure out why the thermostat is not responding or is blank on the display. The display was blank and the batteries were dead, so I replaced them. It is a possibility that your thermostat is this type of thermostat. Next, switch the thermostat to cool and turn the fan on auto. Use a hairdryer, heat gun or toaster and steadily wave the heat on to the display. If I push a button the backlight comes on but still … As the primary source of power, it is possible to have a display on your thermostat but have a problem with the 24-volt system. If nothing seems to be doing the trick, though, it is best to consult with an expert. Help! Required fields are marked *. Try one of the handy HVAC calculators located throughout the site to help you, UVC Light to Kill Viruses and Other Airborne Harmful Things that Affect Health, Blank Display Problem – Screen Disappeared, Honeywell Heat Pump Thermostat Troubleshooting, How Can I Tell 1 or 2 Transformers for Heating Cooling System, How to Wire an Air Conditioner for Control – 5 Wires, HVAC Products Containing Mercury and Proper Disposal, Thermostat Wiring Instructions not Matching New, What Temperature Should I Set My Programmable To, Wiring a Programmable for Geothermal Heat Pump, HVAC Indoor Air Quality Solutions Particulates & Compounds in the Air We Breath. A family-owned and operated company with a strong commitment to outstanding customer service. The LCD display simply shows two dashes where the temperature should be. One reason is that the batteries are dead. Replacing them can often solve the problem. Possibly, also why your display is not working. There are a few different issues that can cause this to happen. First, check the breaker to make sure it has not tripped. © BHI Plumbing Heating & Air Conditioning 2019. If you don’t close the door all the way, the system won’t activate, which cuts the power to your thermostat. then it goes blank, and I cannot adjust the settings. Most modern thermostats are powered by the transformer in your air handler or furnace. The NEST removed too much of our ability to control our thermostat and didn't show outdoor weather conditions. Other possible reasons why your thermostat screen is blank or dead is the transformer is bad, or a thermostat wire is not connected or broken. The display lets us know what the temperature is in the house. But opting out of some of these cookies may have an effect on your browsing experience. Turn the thermostat to heat and turn the temperature up to see if it turns on. Turn the temperature down and wait. If you’d like to troubleshoot this on your own please see the below tips. Honeywell display problem CM901 digital thermostat resolved If your screen is blank and unresponsive, or flashing, it may mean your thermostat's batteries are dying. Use a thermometer to measure the temperature where the thermostat is located. Furthermore, these issues result in no or a blank display on the thermostat. Check the breaker for the air handler and. This category only includes cookies that ensures basic functionalities and security features of the website. replace the thermostat or call an HVAC contractor. These thermostats utilize the low voltage system (24-volts) of the transformer located in your HVAC equipment. Is it a bad thermostat or something else that caused the display to disappear? The thermostats with the battery indicator on the screen will tell you when your batteries are low. Look at the pan. There are many things, including safety-related things that can cause you to lose the 24 volts. I've removed the batteries and replaced them. Air conditioner breakers trip for various reasons. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. We changed it because the display was not working correctly (see photos) which made it difficult to reprogramme. How to Troubleshoot a Honeywell Thermostat Not Working, 10 Ways to Unclog a Toilet without a Plunger, What Does BTU Mean in AC? Most analog thermostats have one switch for indicating heat, cool, and off and a second switch for turning the fan on auto or off. If your air conditioner turns on, it’s working correctly. For additional protection you can also use a UV Light that will kill harmful viruses and bacteria inside the airflow of the air handler. Check these settings. Check to make sure all access doors are closed. 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