Mechanical Devices Flex TC Temperature Forcing System - AS ISThis item is sold AS IS. No returns or exchanges are accepted. Condition For parts or not working Description Unit powers on, but shows error "Fault Cold Side" When you press on the fault, you can hear the unit initialize for a second, then it stops and flashes the error again. Air leak somewhere inside the unit always makes a hissing sound when air is connected. Also states warranty expired and calibration expired. For this reason, we are selling the