Navien tankless flush/maintenance Perfomed full maintenance on navien unit, cleaned air intake filter, water inlet filter, condensate trap and flushed heat exchanger with tankless descaler. Found some buildup of calcium when flushing system, nothing major but definitely enough to continue to recommend a yearly flush. This will help extend the life of the unit. Performed Furnace maintenance and inspection on Lennox G71 furnace. Furnace is in great condition visually for its age, motors sre working well at this time, found no problems or concerns during maintenance. Pulled and cleaned flame sensor on unit during maintenance. Both appliances are in good condition at this time