TROUBLESHOOTING THE TUTTNAUER MANUAL SAFETY THERMOSTAT

Troubleshooting Guides for all Tuttnauer "E" Series Autoclaves - Including Models 1730E, 1730EK, 2340E,2340EA, 2340EK, 2340EKA, 2540E, 2540EA, 2540EH, 2540EHS, 2540EK, 2540EKA, 3870E, 3870EA, 3870EH, 3870EHS, EZ9 & EZ10)

How to Troubleshoot the Tuttnauer Manual Reset Safety Thermostat

(also known as "Cut-Out Thermostat")
Problem Things To Check Procedure
Red Reset Button Will Not Reset Make sure the Chamber has cooled. If the Chamber remains hot the Cut-Out Thermostat can not be reset. Use a sharp pointed object, like the point of a pencil or pen to fully depress the reset button if necessary. When reset a small click can be detected, the button however will not stay in.
  • If power is not restored to the autoclave, then unplug the unit and remove the two power wires going to the Cut-Out Thermostat. Use an ohm meter to check continuity across the terminals
  • If continuity can not be restored across the terminals of the Cut-Out Thermostat by pushing in the red reset button then Replace the Cut-Out Thermostat
Reset Button Is Always Tripping Perform The Following Checks
  • Check that the unit is receiving the correct voltage
  • Check that the Water Sensor is clean
  • Check that the autoclave is filling with the correct amount of water
  • Check that the Cut-Out Thermostat is installed correctly
  • Check that the autoclave is not leaking water or steam
  • Check that the temperature setting is no higher than 273°F (134°C)
If Checks do not resolve the issue, Replace the Cut-Out Thermostat
There is no continuity across the Cut-Out Thermostat To correctly check continuity unplug the unit and remove the two power wires from the Cut-Out Thermostat, use an ohm meter to check across the terminals for continuity
  • Make sure the Chamber has cooled. If the Chamber remains hot the Cut-Out Thermostat can not be reset
  • Push in the small red reset button on the Cut-Out Thermostat. It may be necessary to use a sharp pointed object, like the point of a pencil or pen to fully depress the reset button
 If continuity can not be restored across the terminals of the Cut-Out Thermostat by pushing in the red reset button, then Replace the Cut-Out Thermostat
Cut-Out Thermostat Does Not Turn Off Power To The Autoclave The sensing probe should be installed in the upper channel of the rear most Heating Element
  • The sensing probe must have a tight fit
  • The tubing connected to the probe must not be kinked in any way
  • Check the Heating Elements for a ground short
 If no problem found, Replace the Cut-Out Thermostat

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