The OV-BUS fault is caused by overvoltage on the DC busbar INTERNAL to the inverter. This can be caused by several reasons, but most of them are internal failures of the inverter.
Some of the most common causes for this alarm are:
- Power Board is broken
- Relays are damaged
- Connections between EMI board and Power board are not connected
If you are opening an RMA claim, please make sure to check our article Creating A Support Ticket, additional to the information requested there, please make sure to include a short video that shows the OV BUS alarm active and then shows the nameplate of the inverter where we can clearly see the serial number
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