3. When repairing or replacing the relay, first remove the national relay spring, and then pull out the relay. Do not use excessive force or shake left and right when pulling it out, as it may damage the relay or socket. Faults and troubleshooting methods 1. The relay contact has no output The analysis and elimination methods of the relay contact without output are as follows: (1) Make sure that the relay and socket should be reliably plugged in; (2) Check that the relay should not be mechanically blocked. If foreign matter in the relay blocks the armature, the armature cannot work reliably (forward rotation) or release (reverse rotation), and the contacts cannot be reliably contacted; (3) Check that there should be no foreign matter between the contacts, there is foreign matter between the contacts, and the contacts cannot be reliably contacted; (4) Check that the contact resistance of the relay contact should not be too large. 2. The relay does not work or the relay with a pole cannot be reversed in the forward direction be reliably released.