fuse broken :Change a new fuse.
primary and secondary winding of thetransformer are short-circuited:Change a new transformer.
earthing or the polarity of the capacitor ispunctured:Change a new capacitor.
pilot switch can’t cut off: Change a new pilot switch.
interlock switch hasn’t closed:Change a new interlock switch.
power plug and the socket are not in good connection:Adjust the connection or replace it by a new one.
door hook broken:Change a new book.