What reset button? The one by all the thermostat wire connections? that would tell me that the blower motor didn't start or stopped when it shouldn't have. you said you had the blower motor replaced. Did they use the correct one? I have found there is only one motor that will work and it is very expensive. I found it at Johnston supply listed in there catalog as a Wesco blower motor, They have 2 listed a 1/2 hp and a 3/4 hp. the only one I use is the 3/4. the 1/2hp one even if you are replacing a 1/2hp does not have enough power. It will over heat and shut off on thermal overload.
What part of the Country are you in? I thought Wesco was pretty much a North west thing. Good luck.