Upon arrival system was in working condition. Client stated that unit would run for a while and then turn off. Would turn back on and back off. Client stated that they noticed this behavior yesterday. Looking at the indoor unit , drain lines had back up causing drain switch to trip and turn off unit. Drain lines lead outside , hooked up my shop vac and cleared drain line. Poured down water to assure to back up and drain lines are now clear and flowing. Left system in working condition. Client is also interested in perhaps adding a second unit to that house but will be leaving for vacation. Client said that 2 weeks from today he should be available to schedule a meeting with comfort advisor. Need follow up on 7/19/23.