Hi everyone, I recently purchased a Sonobond Ultrasonic Welder for Plastics (MP3512 w/ Generator SL35-900). After setting it up with the compressed air system and a voltage converter (I'm in the US), I turned the generator on. On the display, I got an "ERROR FREQUENCY." I thought it was because I hadn't connected the horn yet, but even with the horn on, I still got the error. (I was told that I was using the correct horn, too). I made sure the RF cable was plugged in and that there were no visible cracks on the horn, booster, and transducer/converter. After I got "error frequency," I pressed CLR and proceeded to press the dual safety switch. The actuator came down like it was supposed to and I heard a sound, but the machine still said error frequency and my two plastic pieces were nowhere near welded. Can anyone tell me why I'm getting error frequency and how I should fix it? I'm debating if I should replace my horn, booster, or converter since there might be defects that I can't see. Thank you! Any help is appreciated!!