In this research project the preventive procedure described based on thermography, making the description of benefits, multiple applications, technical description of thermographic measuring device, manual use and operation, etc. In it, it is primarily seeks to establish what is currently being done by the process to normalize the alarm by overheating FAN module in iPASOLINK equipment brand NEC, as being located throughout the country isolated cabinets and with other teams steady performance, tend to have such a failure, being more frequent in areas with high temperature climates. For example: the regions of the Colombian coast. Based on the foregoing, it seeks to describe the use of non-destructive testing preventively in this case using the thermographic analysis, it would be a better option to reduce the number of alarms presented on computers for all regions nationwide.