Found Steamer unit on. Watched unit run, saw unit turn off and back on. Looked over unit. Found quarter inch lime build up on the level probes, high limit, thermostat. Will order parts and return to replace. 9-17-18 Removed old level probes. Installed new level probes. Removed old thermostat and high limit. Installed new thermostat and high limit. Had difficult time removing old and installing new thermostat due to scale build up in boiler. Turned unit on and checked for leaks. No leaks found. Verified unit makes steam and drains. Ran unit for additional ten minutes to check for proper operation and intermittent shut downs. Unit did not shut down. Unit is operating normally at this time.