Hot Water Boiler. Perform a tune-up and cleaning to help ensure reliable and safe operation. Inspect for cracks & deterioration of Heat Exchanger. Check and clean Burners, brush and vacuumed-okay Check and clean flame sensor and ignition Assembly-okay note: pilot assembly was replaced on this visit. pilot light was replaced. customer provided the thermocouple. Check Safety Controls-okay Check electrical wiring and components-ok Check LWCO-okay Check water feeder-okay Check back flow prevent-N/A Check expansion tank-N/A Check relive valve-okay Check Gas valve & Gas Line-ok Check Combustion Air, Flue pipe-ok Check Temperatures & Water pressure settings; Performance-N/A Check and run Thermostats-okay Check circulation pumps-N/A Perform inspection on a HWH. Check for water leak, no leakage at this moment. Check gas valve-okay Check gas line-okay Check combustion and flue pipe -okay Run and monitored for good operation-okay Run system, check radiators, all of them getting hot, left sys