lilrobo

i bought this hot tub( spa ) Catalina ? i think anyways it been working great for 2 weeks now myabe longer , this evening went out to get in it the temp shows 107 , i normally keep it at 104 , i turned on the jets and blower for a min or so it didnt lower any but when i turned off the jets and blower i couldnt here anything , so what could make it do that ? is the stat going out ? i did lower it to 103 just to see if it would come down over night thanks