Arrived to find drain line clogged Also found extremely plugged 18x18x1 return air filter restricting air flow to air handler causing system to pull water from drain line tripping float switch. Advised client that drain cleaning was necessary and that adding a drain line cleaner tab was highly recommended to both systems in home. Client wanted to only clear and add treatment tab to main system in home. Performed the below task and checked system operation to find now working as designed Task Includes -Installation of condensate in line drain cleaner -drain line clearing CLIENT HAD NO REPLACEMENT FILTERS AND HAD TO LEAVE MAIN FILTER OUT UNTIL NEW WAS BOUGHt