I observed that it was depleting, but I continued to try to drain even though the drum had no water. From what I assumed the fault was in the pressure switch, clean all the rubber pipes from the drum to the pump and from the pump to the pressure switch, including the filter. There was not much trash or they were covered. I blew the pressure switch diagram through the hose and set everything back. He did not go back to the fault. Thank you very much! Now another fault has arisen, for which I will open a new question.