No cool. 2017 nordyne package heat pump for mobile home. Upon arrival I found the thermostat with a locked out screen. Removed from wall, removed batteries and reinserted them, and reset the thermostat and unit fired right up with no issues. Let system run while checking unit and it brought the house down from 105° to 96° before leaving. Advised customer that I did write up and estimate to replace the thermostat if issue happens again, but unit is running and cooling as designed at this time.