Sterling RT - Manual (Page 46)

45 SV01H
Troubleshooting and Diagnostics
Fault Cause Remedy (1)
Single-Phase fault A mains phase has been lost Check mains voltage
U Start fault Start command was present when power
was applied (P110 = 0 or 2). • Must wait at least 2 seconds after
power-up to apply Start command
• Consider alternate starting method
(refer to P110).
(1) The drive can only be restarted if the error message has been reset.