Almost always the problems are the heater is too dirty. with it out in the floor where you can get to it. give ti a good cleaning before you open it up. Once cleaned the very top can be removed and you can see the motor and the combustion chamber. On the side of the combustion chamber thiers a hole with a light senser lined up with the hole ( so it can (see) the flame ). This senser needs to be clean and lined up witht he hole. Theirs filters in the back of the motor pump assembly. The manufacture sells a tuneup kit ( spark plug. pump vanes, several filters, pump cover ) you'd think you don't need all this stuff but you do. When you get the new parts on and the unit is good and clean turn the fan blade with youur fingr just to see it turn smoothly, If it doesn't your still cleaning aroud the pump vanes and the pump rotor ( this turns real fsat and it needs to turn smoothly with little or no resistance the directions that come with the tuneup kit tell you how and where to cleanit till it turns easy ( turning hard is what makes the overheat kick it off) with it clean and turning smoothly put it together carefully so it fitts together right. ( so it'll turn good ) now it'll work good till it gets dirty again.
There is a heat sensor device that needs to be change,and that will fix your problem.
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Is the heat sensor under the "barrel" in front of the igniter on the TS175KT?
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