TROUBLESHOOTING THE TUTTNAUER MANUAL SAFETY THERMOSTAT

Troubleshooting The 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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