Locating failure of landing door safety circuit

A fault location unit of a landing door safety circuit, wherein the landing door safety circuit comprises a plurality of landing door locking fault monitoring modules connected in series, each of which is disposed corresponding to each landing;

• wherein the fault location unit comprises:
• a fault collection circuit, which is disposed corresponding to the landing door locking fault monitoring module of the landing door safety circuit at a certain landing, and which is configured to collect a signal indicating landing door locking fault from only the landing door locking fault monitoring module at said certain landing and output a corresponding electrical level signal;
• and
• a fault sending component, which is electrically connected to the fault collection circuit in a one-to-one correspondence, and which is configured to send corresponding fault information containing landing information of the landing based on the received electrical level signal.