I could not find anything on the model number you posted, but maybe the model is KFIS25xVMS
I would make sure the wires that plug into the thermal limiter are tight.
If the wire spades that plug into the thermal limiter are loose you can squeeze them together a little bit with a pliers so they make a better connection with the thermal limiter.
A loose connection can generate heat, just a thought.
And are thermal limeters self reseting or one time use?
One time use.