When the vicinity of a Hoover carpet cleaner becomes too heated, a thermal fuse shuts it down. It prevents the carpet cleaner from starting until the thermal fuse has cooled down as a safety measure. Give it at most 24 hours to be sure that's not the problem. The power system in the wall outlet should then be checked. Circuit breakers and fuses can occasionally fail. When it happens, modify it. Checking the fuse in the vacuum cleaner plug is useful.