I returned to install a condensate neutralizer pump. I proceeded to disassemble the defective condensate pump. Clean and prepare the work area. I proceeded to install the new condensate neutralizer pump NBT-400P. I concluded with the installation of the new condensate pump NBT-400P. I inserted the neutralizer pellets in the new pump. Add clean water in ml new condensate pump. The pump discharged the water correctly. Concludes with the installation of the new condensate pump NBT-400P. Next I proceeded to do the heater exchanger cleaning in the WeilMclain Ultra high efficiency boiler. Disassemble the front cover of the heater exchange. I proceeded to clean with a metal brush and suck the dirty h the cardboard residues of the heater exchanger with the vacuum. I cleaned, cleaned and shone the heater exchanger of this unit. I proceeded to install all the gaskets and gaskets necessary for the cellar and secure the front cover of the heater exchanger. I pressed and secured the f