My a/c stopped working because the batteries in my (honeywell) thermostat needed to be replaced.

Changed batteries in honeywell thermostat now not working. If your thermostat screen is blank, the first step is to check the batteries in the device. Let's check to make sure you didn't damage the stat then. Connecting r to y will turn on the condenser (outside) unit (assuming everything else is working okay).

Gently press the side of the thermostat to retrieve the battery compartment remove the depleted batteries and replace. For context, here is the correct way to install thermostat batteries: Open the side compartment in the thermostat to reveal its batteries.

Press the down arrow button until reset appears on the screen. After keeping he batteries in the backward position for 5 seconds, remove them from the chamber. If your honeywell thermostat is not working and there is no display, we recommend you work through the following troubleshooting steps.

If “my ac is not working” means that it is blowing hot air after the batteries have been changed, check whether the thermostat setting is on “cool” and not on “heat.” it is possible that. Before this, you could attempt to. When the batteries are dead or even low on juice, you will notice problems like fading digits, flashing symbols, and so on.

You can try removing the batteries and installing them backwards for 10 seconds, then putting them back in correctly. Just insert some fresh batteries to fix the problem. Turn off your honeywell thermostat and unplug it from the wall.

Replacing the battery turn off the thermostat. Put the new batteries in the compartment and slide the protective plate over them. As you have found, connecting r to g turns on the air handler (blower).