American Standard GPH hydronic boiler no work millivolt. New pump & Resideo L8148J1009 aquastat fix.

American Standard GPH hydronic gas furnace would not ignite the burners with pilot on. This millivolt system had a problem possibly with the new aquastat control device. the auto and manual switch did not work or was installed wrong to damage the relay engaging or high/low device that allows 24 volts to keep burner on or circulation pump on. New shorter designed Bell & Gossett pump installed.