The HVACR Licensing Board may, on its own motion, make investigations and conduct hearings and may, on its own motion or upon complaint in writing, duly signed and verified by the complainant, suspend or revoke any license called for under this part if it has reason to believe that the holder of such license has violated any provision of this part or order prescribed by the board or has demonstrated a pattern of incompetence to act as an HVACR license holder or mechanical inspector.