Heating Maintenance Neutralizer stone 1 Gas Hot Water Boiler: Navien High Efficiency Boiler w/ x2 zones. Perform a tune-up and cleaning to help ensure reliable and safe operation. Inspect for cracks & deterioration of Heat Exchanger Check and clean Burners and heat exchanger- ok, Check and clean flame sensor and ignition Assembly-ok Check porcelain for crack or carbon buildup. Check igniter electrode gap. Check Safety Controls-ok Check electrical wiring and components-ok Check Gas valve & Gas Line-ok Check Combustion Air & Exhaust-ok Check Temperatures & Water pressure settings; 16 psi Performance-ok Check and run Thermostats- operating well at this time. Check zoning operation-isolate and run zoning. Check circulator pumps-ok amps and voltage check. Check for water leak no leakage at this moment. Ran and monitored for good operations. All zones are fine supply and return lines getting hot. Perform check for 50gal HWH. Check for water leak, no leakage at this time. Check control gas