need advice in a major way.... I had to replace the tool head board (broke an eddy screw), also replaced hot end assemblies due to a major blob of petg. then as i was disassembling to replace said hot-end assembly the extruder fell from where i had put it temporarily i happened to snatch one of the eddy sensor wires loose. so all in i replaced complete hot-end assembly, the tool-head board ,and the extruder unit.

Powered up after the replacement parts finally came in and all seemed well until i looked at my nozzle temp thinking it should be nearly at 0 and to my surprise it is on 155 like that was 0. i can raise the temp and lower it. everything seems to work right except for the temp. it will not go lower than 155 and no higher than of coarse 300. this is on my A1 mini. need ome help here please.