Arrived to thermostat off, SS1 water safety was tripped found drain line clogged, blew through drain line and tested drain. Drain is operating as designed. Other system also had a clogged drain line and water had over flowed the coil pan in to drain pan. Vacuumed water from drain pan and flushed drain line and tested, drain is operating as designed. Both systems are now functional and drains are operating as designed.