Why is my Delta RPI M30A showing AC Freq High (E01)?
- RRhonda FletcherAug 26, 2025
If your Delta Inverter displays 'AC Freq High (E01)', it might be because the actual utility frequency is over the OFR setting, the country setting is incorrect, or there's a detection circuit malfunction. Check the utility frequency on the inverter terminal, verify the country setting, and inspect the detection circuit inside the inverter.