Most modern thermostats will have a clearly marked reset button inside the panel. It's usually small and recessed, so you might need a pointed object like a paperclip to press it. For those wondering specifically how to reset air conditioner thermostat models, the process is generally the same.
When the batteries are dead, the thermostat won't work. However, if you choose to use a Common wire, system power will operate the thermostat, and the batteries will only be used for memory backup when system power fails.
If your thermostat does not have a reset button, try to remove the batteries and then press some buttons to attempt further power discharge. If that does not have results, remove and insert the batteries opposite polarity as shown and count five seconds, pull them out, then insert them back correctly.
Sometimes, the thermostat or another electrical device can cause the breaker to trip or blow a fuse. This will shut off power to your thermostat and if there's no battery backup, the screen will go blank. Check the breaker. If the breaker has tripped, simply flip the switch back to reset the circuit.
The most common reasons for a blank thermostat screen are dead batteries, a power outage, a tripped circuit breaker, faulty wiring, or a failed thermostat. The screen will be completely dark and unresponsive when there is an issue with power reaching the thermostat.
On average, a thermostat takes around 5 to 10 minutes to reset. However, the exact time may vary depending on the specific model and brand of the thermostat. During the reset process, the thermostat goes through a rebooting sequence, which includes shutting down and restarting.
If your thermostat is set to a temperature regulation mode or has an energy-saving program enabled, it might reset to conserve energy.
To reset a non-programmable digital thermostat, you'll need to take the face-off and hold the reset button for five seconds. You can also try removing the batteries for five seconds. Both of these methods should result in a reset thermostat.
If you own a Honeywell thermostat, the blank screen could be an indication of a furnace door that wasn't completely closed. These thermostats are programmed to shut off entirely if a furnace door is open. To rule this out, double-check to make sure your furnace door is fully closed.
When low batteries eventually die, you'll see a black display screen, the thermostat will stop working and your heating or cooling units won't function. The heating and cooling system cannot respond to nonexistent temperature commands.
Find the breaker to your HVAC system, flipping it 'off'. Make sure the breaker is flipped all the way 'off,' then wait for 30-seconds. Turn the breaker back 'on. ' Return to the thermostat control panel and flip the thermostat back into the 'on' position.
Factory reset removes all your personal settings and restores the thermostat to factory default settings. After you reset your thermostat, you'll need to set it up and add it to your home in the app again, just like you did when you first installed it.
Power Supply Woes. A power supply issue is one of the most common culprits behind a blank thermostat screen. Thermostats typically require a constant power supply through batteries or a wired connection.
A bad thermostat can be detected when your AC or furnace is not turning on, your HVAC systems are not turning off, the thermostat not responding, your HVAC system is short-cycling, the room temperature not matching the temperature displayed on the thermostat, and the programmed setting resetting themselves.
If your thermostat is still turning up blank after inserting fresh, new batteries, then it might be time to check your heat and air conditioning systems. Sometimes, the transformer will stop sending voltage to run the thermostat. Start by checking the air conditioning safety switch, which is in the drain pan.
Leave the thermostat and circuit breaker off for at least 30 seconds to allow the device to reset. After 30 seconds, turn the circuit breaker back on and switch the thermostat back to the "on" position. Finally, reprogram the thermostat with your desired settings.
There is usually a small reset button somewhere on the thermostat. Finding this button may require that the thermostat panel be removed and pressing this button may require something like a paperclip to push. Hold the reset button down for 5 seconds and the thermostat should reset.
When batteries are low or missing, the thermostat may lose its programmed settings, revert to default settings, or even shut down altogether. This can lead to uncomfortable temperature fluctuations and increased energy consumption as the heating or cooling system may not operate optimally.
By pressing “Hold”, your thermostat will lock in the temperature it's currently at until you change it again. When you are ready for your normal schedule to resume, simply press the “Run” button and return to your typical programming.