Check the Battery If your the screen on your thermostat is blinking, it may just mean that the battery is low, and this is simply your unit’s way of telling you to replace its batteries before it dies entirely. If this is the case, unscrew the thermostat from your wall and replace its batteries.

Open the door on the front of the thermostat. Replace with 2 high quality AA Batteries (Duracell or Energizer). If you don’t see batteries behind the door on the front, pull the thermostat off its sub-base with a firm tug to access the batteries at the back of the thermostat.

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.

If your Honeywell programmable thermostat flashes “Batt Lo,” you simply need to replace the battery. If the thermostat is malfunctioning and will not reset, simply cut the power to the thermostat and it will reset itself.

One other common reason why your thermostat may be blinking is that it has a low battery and it is warning you it’s time to replace it before the battery dies. What to Do: Changing your thermostat’s battery is quite simple. You just have to unscrew it from the wall, replace the batteries, and screw it back on.

The thermostat shows a flashing. symbol on the LCD screen when the batteries are exhausted and need replacing.

When you see the blinking snowflake, it means that the thermostat has entered delay mode. This is a safety function meant to prevent the HVAC system from short cycling.

When your thermostat batteries die, you will see a black screen, the thermostat will stop working, and the heating or cooling units will not work. If, after the change of batteries, the thermostat and the heating and cooling systems start working, then everything should be back to working as normal.

If your thermostat is blinking, here are a few ways to troubleshoot it. If your the screen on your thermostat is blinking, it may just mean that the battery is low, and this is simply your unit’s way of telling you to replace its batteries before it dies entirely. If this is the case, unscrew the thermostat from your wall and replace its batteries.

Some Pro1 thermostats will turn off the display light when the batteries are getting low. The display light will return to normal operation after the batteries are replaced. What kind of batteries should I use in my Pro1 thermostat?

All Pro1 thermostats use 2 AA batteries. We recommend Duracell® or Energizer® brand batteries for the best performance. How do I change my batteries? Open the door on the front of the thermostat. Replace with 2 high quality AA Batteries (Duracell or Energizer).

The thermostat can be reset by power cycling. Power cycle the thermostat by removing if from the subbase and remove the batteries (some thermostats will not have batteries). Wait 10 seconds and then replace the batteries and place the thermostat back on the subbase.