Upon arrival found thermostat completely blank. Checked indoor unit found water backed up causing inline safety switch to cut unit off. Unit is out install from about 1yr ago. Unit has blowout valve missing, unit has safety pan switch, in-line switch but no blowout valve for access to clear/flush drain lines. Got in contact with on call manager for today and informed him issue, he stated if I could let water from the in-line switch out just for right now and he will get install back out here tomorrow to do corrections and install blowout valve, clear drain line. I have drained the water out from the in-line switch, unit kicked on right away and informed customers the issue that was happening, I informed them I’d rather for them not to run the ac due to water backing up again to the in-line switch and causing issue to happen again. Customer is now aware. I have left unit off right now indoor temperature is at 72. No other issues were visible, recommended plumbing special, customer sig