Replaced aquastat and cycled boiler. Inducer motor FLA .6, capacitor ok at 3.0 MFD, circulator pump FLA .7, safeties ok, gas valve & burners ok, expansion tank ok, auto vent valve has corrosion but operational, exhaust flue ok, water pressure 18 psi, water temp 157 and rising, high limit set at 180*F. Boiler runs well at this time.