Echoflex Controller Not Powering On Last updated Save as PDF Symptoms/Issue Echoflex Controller or Interface is not powering on. No LED indicators will illuminate on unit. Description/Explanation of Issue Either the unit is not receiving proper power or is internally damaged. Fix/Solution Meter incoming power to the unit. If voltage is good, replace the unit. If voltage is not good, continue troubleshooting upstream to determine the cause and resolve at that point.