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Performed Precision Heating Tune Up on Weil McLain High Efficiency Boiler. Cleaned Heat Exchanger and Flame Ignitor assembly. Cleaned Condensation Pump and tested. Found pump was not pumping the proper amount of water out. Found the Check Valve on the Discharge had gone bad and was not opening properly. Replaced Check Valve and filled pump multiple times to test operation. Put system in operation and measured Combustion Readings. Found water pressure to be higher than normal at around 30 PSI. Removed Water from boiler to lower pressure down to around 20 PSI. Checked Expansion Tank and checked Water Feeder. Also found unit was intermittently going out into a lockout and then reset itself due to the Supply Water Temperature sensor. Found a loose connection at the wiring terminal for the supply water sensor. Reconnected wiring and tested. The gaskets are starting to become worn on the system. Would recommend on next tune up having all of the Gaskets replaced using the Weil McLain mainte