Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 - Manual (Page 50)

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10.3 Display of the BASIC Inverter
Status LED - green
Constant Motor stopped (Standby)
Blinking Motor run
Error LED - red
The type of error is indicated by the blinking-code of the ERROR LED.
1 blink Undervoltage
2 blinks Overcurrent / Overload
3 blinks Inverter overheat
4 blinks Overvoltage
5 blinks Code Error
6 blinks Motor overheat (external contact is open)
For detailed information see chapter 11 Failure messages.