Some Honeywell models also have a low battery notification, which will use a tone or the words "replace bat" when it's almost time to replace the batteries. Remove the front plate of the thermostat from the wall to find the batteries and change them. What can cause this to happen? Make sure the positive and negative terminals on the battery are lined up with the positive and negative receptors on the thermostat. Blank Screen - the screen of the Wiser Room Thermostat is designed to time out several seconds after use, in order to save battery life. As the name suggests, programmable thermostats allow programming for different functions for more economical operation of your HVAC system. Some thermostats have a tiny reset button hidden for such occasions. If yours is up there in age, check with your local HVAC professionals to see whether or not your thermostat needs to be replaced. There are lots of connections within your thermostat. 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™ . During the warmer months of the year when the air conditioner is being used, this generally takes place when there’s a water overflow in the condensate pan. The type of thermostat you want is also important to consider. It doesn’t matter which lead you place on which terminal. If the red wire is broken or loose on the thermostat connection, the thermostat will not work. A small battery on the thermostat performs this function for a few minutes while you change the batteries. If your HVAC system doesn’t respond to the thermostat after you change the batteries, or the thermostat itself doesn’t come back on, it is an indication that the thermostat isn’t getting any power. Generally, the reset button is small in a recessed housing. Most new electronic thermostats have a base plate to which the wires are attached. If the circuit breaker trips, it may shut off the power to your thermostat, clearing the screen. Dead batteries. Some thermostats require battery power, and if the battery dies, your screen will go blank. Some programmable thermostats allow you to program individual routines by day or week. If your thermostat is blank, here are the five common culprits. This power is typically 24-volt AC power coming from a transformer in either the heater or air conditioning system. There may be a problem with the air conditioner or heater that has caused the transformer to stop sending voltage to run the thermostat. Open the thermostat check the battery placement. Attach the multimeter lead to the red wire on the thermostat. Not all thermostats run off voltage coming from the HVAC system. • If display is blank or says ‘bAt Lo,’ install fresh batteries. Once you replace the batteries, you may need to reset the unit and reprogram your settings. Tripped circuit breaker or blown fuse. Manual thermostats are also known as “mechanical” or “non=programmable” thermostats. Check the back of the thermostat and the base plate. Think of a programmable thermostat with a mind of its own. The type of heating and cooling system you have is a major factor. 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. Not finding any information like that in your thermostat manual. Reinsert the batteries and place the face plate back on the wall. Any AC system requires two wires to operate properly. Washing Machine Keeps Filling With Water When Turned Off? The cheapest of all the options, the manual thermostat is just what it says. These wires connect to the HVAC unit allowing the thermostat to communicate with the HVAC unit. 5) Display goes blank during heating– most likely the furnace is tripping on high limit or some other safety limit. To change the batteries, you have to detach the faceplate of the thermostat from the wall. Smart thermostats like the Nest use the wires connecting the heating and cooling system to recharge. While the most common Nexia™ issues tend to be connectivity, there might be other issues you have concerns about. The best place to find information about resetting your thermostat is in the user manual. A plus and minus sign in the battery tray or cover indicate the proper position for the battery. Clean the battery contacts with a pencil eraser and gently pry out the spring contact so you get the best connection. All thermostats are different, but the average device has a life expectancy of around 10 years. The Batteries Are Dead. The programming functions allow you to tell the heater to raise or lower the temperature when you are at work. If the thermostat runs from the house’s electrical system, check on the circuit breakers. If this is the case, your thermostat may need replacing. In most new electronic thermostats, the batteries are used to power the memories in the thermostat to hold the user settings if the power fails. No family should be forced to deal with a problematic thermostat that makes their home unbearably hot or freezing cold. There are several things you need to check to make sure the thermostat you want is compatible with your HVAC system. Figuring out why your thermostat isn’t working after changing the batteries is a common question. Dennis is a retired firefighter with an extensive background in construction, home improvement, and remodeling. Digital wall models will give this signal as early as one or two months before the batteries die. While a blank thermostat screen isn’t always a serious issue, it is something that should be addressed quickly to avoid future problems. Fill out your email below to get exclusive deals only available to our email buddies. 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