On Sun, 03 Jun 2018 14:44:13 GMT, Lynda
m wrote:

Replaced my batteries in thermostat when low batteries flashed on the screen
but my air conditioner will not come on. Is there a reset required?

Check and clean the battery contacts, a simple easy thing to try. You
can use a newer piece of paper money to clean the contacts. Fresh
paper money is slightly abrasive but not so abrasive as to damage the
contacts.