Dallas resident wanting an estimate and Upon arrival found system cooling. Homeowner stated that the thermostat would lose power, turned system on and checked indoor unit, found water in emergency pan but trap was empty. After letting system run found that the main drain line was stopped up causing float switch to turn off thermostat. Checked outdoor units pressures, amp draws and capacitor all looked good. System appears to be tied into tub drain somewhere. Homeowner said that the tub has been draining slow. Homeowner wanted to get a plumber out to look at tub drain first.