SERVICE CALL: Upon arrival homeowner stated the second floor hvac system is not working at all and the ecobee thermostat was completely Blank. After complete troubleshooting I found the main drain line Was clogged and overflow and open the wet switch. Customer approved Repairs and clean main drain line and removed the water inside the unit And replace and install new wet switch under warranty. Flushed both drain lines with 2 gallons of water test cooling mode system is working ok at this moment. Thanks for choosing te certified Recommend routine maintenance and new pleated filters.