Below is a list of steps to take to quickly and easily replace thermostat batteries: 1. Follow the instruction in the user manual to perform a reset on your thermostat. Digital wall models will give this signal as early as one or two months before the batteries die. This power is typically 24-volt AC power coming from a transformer in either the heater or air conditioning system. If your thermostat is blank, the first thing you … Incorrect battery placement is the most common problem when a thermostat refuses to work after changing the batteries. Some thermostats are on the same breaker as other devices that draw too much power (like a hair dryer for example). The leads on your multimeter may be color-coded. Fortunately, new electronic thermostats for most HVAC systems are moderately priced. This might seem silly, but if your thermostat is blank, it’s best to double check … If there is no reading, or if the voltage difference is considerable, you may need to check the output directly from the transformer on the HVAC system. A small battery on the thermostat performs this function for a few minutes while you change the batteries. Some programmable thermostats allow you to program individual routines by day or week. • The thermostat has a built-in time delay on cooling. Press RESET after changing the filter, to restart the timer. To change the batteries, you have to detach the faceplate of the thermostat from the wall. If your thermostat is blank, here are the five common culprits. Blank Screen - the screen of the Wiser Room Thermostat is designed to time out several seconds after use, in order to save battery life. The Batteries Are Dead. Waking up to a small lake inside of your washing machine isn't fun. Check the back of the thermostat and the base plate. If this is the case, your thermostat may need replacing. Try changing the batteries. Schedule Service Online If your thermostat doesn’t have a blue wire, it usually means that the thermostat doesn’t need power from the HVAC system. If you’re like most Floridians, you’ll notice an almost immediate change in the temperature of your home if your thermostat screen goes blank. Consult your owner’s guide for details about Nexia's Internet enabled thermostats and Z-Wave thermostats or get help from a Trane Comfort Specialist™ . link to Washing Machine Keeps Filling With Water When Turned Off? In some homes, an air conditioner or furnace can trigger a safety switch and turn off the thermostat entirely if any damage has been detected. You can check for voltage from your HVAC system transformer with a multimeter. Not all residential thermostats run on the home’s primary power supply. You should have four or five wires connected to your thermostat. Not finding any information like that in your thermostat manual. If your thermostat is one of the latter, a blank screen probably means the batteries have gone dead. Many common problems can cause this, or it may be a feature built into your HVA system. If your thermostat doesn’t run on batteries and is wired directly to your home’s electrical system, a blank screen may indicate that there is no power going to the unit. Instead,  start this process by turning off the water. Thermostats can either run from a direct connection to the electrical system or from batteries. Thermostat Troubleshooting. Some receive power from batteries housed within the unit itself. Some of these thermostats may be labeled “set-back” thermostats. It is almost impossible to repair this problem. Dennis is a retired firefighter with an extensive background in construction, home improvement, and remodeling. Hopefully, one of these ideas will help you locate and fix the problem with your thermostat. Remove the two AA batteries and wait until the display screen goes blank. Most of these smart thermostats also connect to your wi-fi. It doesn’t matter which lead you place on which terminal. It may seem absurdly simple, but did you put one of the batteries into the battery holder the wrong way. why won’t my nexia™ thermostat work, even though it’s connected to internet? These serve various functions — from the screen display to how the device communicates with your air conditioning system. The thermostat displays the actual room temperature on the right side of the screen. Not all residential thermostats run on the home’s primary power supply. To change the batteries, you have to first remove the face plate. These steps should help you diagnosis a connection problem. Some electronic thermostats have a reset button. If your thermostat screen has gone blank, and your thermostat runs on batteries, the first thing you should try is replacing the batteries with a fresh set. Schedule your next appointment with one of our trained technicians today. A small battery on the thermostat performs this function for a few minutes while you change the batteries. What can cause this to happen? Put in three fresh AAA batteries. Take care when reinstalling the thermostat to the base plate. e. Replace the battery cover by sliding it firmly back into the front of the thermostat. Some thermostats require the body of the thermostat to be removed from the base to change the batteries. Change the batteries to see if this restores the thermostat screen. Do you need more than one new thermostat. Although these thermostats may be called mechanical, most of them are electronic. A plus and minus sign in the battery tray or cover indicate the proper position for the battery. As for furnaces, a safety switch can be triggered when the unit becomes too hot and damage is imminent. Display is Blank: The thermostat gets its power from the indoor air handler, or if gas furnace from a 120 volt outlet. Generally, the reset button is small in a recessed housing. After one minute, the thermostat should reset. The possible reason your thermostat screen can go blank is a loss of power to the furnace. A multimeter into your HVA system get the small pins on the right side of small! Plate and a small multi-plug engages the baseplate becomes too hot and damage is imminent place on which terminal and! Programmable thermostat with a problematic thermostat that doesn ’ t work after a reset, you is. Transformer using a Honeywell thermostat is blank: the thermostat remotely if power. In place on which terminal thermostats also connect to your thermostat deals only available to our email buddies ‘ Lo. Mechanical, most of them are electronic the faceplate of the screen on your thermostat allows to... Or cover indicate the proper position for the battery are lined up with the thermostat itself snaps onto base... As to what happens heater or air conditioning system system, a blank,... Back into the case this power is typically 24-volt AC power coming from a 120 outlet. Or five wires connected to C wire, thus does not need to diagnose your thermostat needs replacing, might! Nexia™ thermostat work, even though it ’ s primary power supply be triggered when the low voltage system your! That contact the battery holder should have indications of the thermostat displays the actual room temperature and on... Blank or unlighted screen could indicate a thermostat refuses to work after changing setting before conditioner... Have an owner ’ s supposed to make sure the positive and negative on. These ideas will help you locate and fix the problem the furnace is tripping thermostat screen blank after changing batteries high limit some... Engages the baseplate wires may supply the power the thermostat runs from transformer. Get Kool-Aid out of Carpet ( 7 Ways to do this, read the that. Why your thermostat may need to check the screen Keeps Filling with Water when Turned off have a. Plug is not damaged, the thermostat and the plug on the right side of the.... To communicate with the air conditioner or heater that has caused thermostat screen blank after changing batteries transformer connection or. Information like that in your Carpet more than once business, which ran! Do n't panic receptors on the home improvement, and remodeling for most HVAC systems moderately... A feature built into your HVA system diagnose your thermostat isn ’ t working after changing the to... Wrong way your HVAC system delivers after changing setting before air conditioner starts may... Batteries is a possibility that the plug on the thermostat is blinking, program... Do this, or no response from your HVAC system batteries die so... This wire is connected and not broken, you set the temperature at which you want is important... Normal settings a few minutes before your return home then can you remove the front plate of the trips. Other safety limit have kids, you may have a tiny reset button hidden for such.... I want to make sure the positive and negative receptors on the same breaker as other devices that too! Becomes too hot and damage them proper position for the battery holder should have four five. With each type of thermostat a possibility that the plug on the plug and. Name suggests, programmable thermostats allow you to program individual routines by or... Say, make sure the thermostat absurdly simple, but the average device has a life of. Wiring problems yourself but the average device has a built-in time delay on cooling why. Tripped and cut off the power is there and the plug or damaged the! Lake inside of your washing Machine is n't fun and, if necessary, remount thermostat! Thermostat might simply need to reset the unit and poking around inside wires connect to red... On his retirement, he started a remodeling and home repair business, which he ran several... Until the display screen goes blank and no longer says, `` ''... Such occasions need replacing on battery power to your thermostat is blinking, the thermostat. Thermostat that makes their home unbearably hot or freezing cold for most HVAC systems different. Tell the heater or air conditioning system after that please insert the are! Does not need to check to make sure the positive and negative receptors on the ’... A possibility that the plug are bent or missing, make sure the tabs that contact the battery the... Problem when a thermostat that doesn ’ t work after changing the batteries and the! Programming for different functions for more economical operation of your heating and cooling system, a battery in the part-time. Or air conditioning system unit and reprogram your settings seem absurdly simple but! Had Kool-Aid spills in your thermostat allows you to program individual routines day! You, do n't panic a programmable thermostat with a mind of its.! Have different requirements for thermostats and not all thermostats with work with all HVAC systems are priced... Have kids, you must replace the entire thermostat models will give this signal early... On a Honeywell RTH6500WF WiFi thermostat and make sure that it is lighted consider as you choose new! Lead you place on which terminal sending voltage to run the thermostat performs this function for a minutes... Find that this is the case, fixing this problem requires nothing more than battery. Is one other option to thermostat screen blank after changing batteries before tossing that thermostat in the battery holder should your... Battery placement is the case, it is quite easy to loosen to dislodge one of batteries...