After experiencing battery drain problems, my prosine 2.5 is indicating a fault and will not reset. Manufacturer suggested placing bybass switch on the left side to bypass for 1 hour and then returning switch to normal. Still shows fault. will not reset.
Its toast. Ordered new Magnum Hybrid 3012
Manual in the forum here

What fault code are you getting (Visual Fault Code page 3 and 8, then see error code table at end of manual)
Code is 000 (No Fault)
Fault and Warning lights flashing red
I have a feeling that they are telling you the batteries are very low. If I am not correct someone will chime in with real reason. I have not had this indication so just going by gut feelings
JohnH
Mike,
Try a hard reset........................disconnect a battery cable from the inverter for 10 minutes or more, then reconnect.