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I. There are five possible causes for the fault in electromagnetic flowmeters where no 4-20mA output signal is generated: 1. Faults in the connection cables (excitation circuit, signal circuit) at the system level； 2. Power supply failure – the power supply is not working properly ； 3. Faults caused by damaged sensor components or an adhered layer on the inner wall during measurement, etc ； 4. Faults related to liquid flow conditions ； 5. Faults related to damage to the components of the converter. II. Check and eliminate faults: Verify the process to ensure that the electromagnetic flowmeter does not output a flow signal. First, conduct a preliminary investigation and assessment following the established process, and then carry out detailed checks one by one to identify and eliminate faults. The sequence of checks outlined in the process is based on the following principle: 1. Prioritize those checks that have occurred frequently in past on-site repairs and are likely to arise after sales ； 2. It can be understood through observation or inquiry without the need for complex procedures; start with the easier tasks first ； 3. For checks with higher sequential requirements, those come first. If several causes of failure are ruled out after preliminary inspection, it can be returned to the electromagnetic flowmeter manufacturer for repair.