Hi sir:
If the electromagnetic, is NOT pull in, with the impression, try to clean it, otherwise, you must to have to replace, to due the magnet that is fault, by the use. .However measure if the voltage is o.k in the terminal, look for loose wires, or corrodes, or semi broken wires, or coil of solenoid, is OVerheating( not burning), time to replace it or make a new windinding.!