The existence of the red blinking or flashing gentle indicates that the filter should get replaced. An illuminated red blinking/flashing gentle that seems after a new filter has become inserted may perhaps indicate that there is Filth within the filter housing. The reset button is caught from the on position. https://purwaterfilter53074.wikitron.com/3602297/5_simple_statements_about_pur_water_filter_blinking_red_explained