ok, do you happen to have the model # XXXXX the control available?
I am assuming we are going off on a limit. But will know more if I know the control you are resetting
Ok, this is a limit device which can trip on either high or low temps. I would see what your boiler temp is set for,m and then look at the setting for the reset control.
Example - you have your boiler set at 180 degrees and the reset control set at 190 degrees. The boiler overheats and the reset control trips to shut down the boiler.
Sometimes people will turn up the boiler temp and not the reset temp and cause nuisance trips.
If this is not the case, I would identify why the boiler is overheating, even if it takes calling a serviceman.
Check the set temp and the trip temp.
New info...Your controller with the button should have 2 pointers, one for desired and one for limit. Sonds like you are over shooting the set point. Spread the temp diff a bit.
You may need a new controller.