overheat: left it on all night and now doesn't work Check heating elements check overtemp switch heat light coming on? to be sure: bypass switch (connect wires from overtemp switch together and run for a few minutes). Heat Light comes on? Chamber get warm? If yes, replace switch If no: check function switches To reset switch: Turn counter clockwise, run unit, when temp reaches 262 degrees, turn switch clockwise until light goes off (contacts break) allow to cool (double check this with mark at rpi)