Upon arrival, code 31 is present and indicates that the pressure switch did not close or reopened. Reset code and performed a test run. Exhaust motor came on as it should but was filled with water and making a splashing noise. Inspected, removed, and cleaned out drain trap. Clogged drain trap causes exhaust motor to not operate at full capacity and does not allow the pressure switch to close. Test ran system after cleaning and found no other issues. System is currently operating properly.