chris77

Thanks, I will try adding a common 0v. And check the rio

The main panel has 2 bell boxes set to use internal battery on alarm, the power rio also has a single bell box connected.

The software on main panel is 1.5 The main panel is connected to the P RIO just by 2 wire no power linked, all sensors take power from that P rio, ie between the two building is just two wire link. The only thing is the RF box its wired as end res - house key pad - ether net - main panel - rf box -(2 wire no 12v)- p rio - keypad - end res so the last keypad is powered by the rio. The rf is last powered on the main panel, but is assigned to a zone on power rio so don't know if this would be an issue.

Yes the system runs fine on battery, there are two one in main panel and another in powered rio, batteries check out ok and I don't get any battery faults on panel. I seem to remember the RF G3 had too be assigned to a zone for groups, main panel was full these are all house sensors ie G1, the P-RIO is for an outbuilding G2 but not all 8 were used so assigned it to a un used zone on there, but not sure why his would cause the mains fail to unset.

I have a G2-20 panel with RF and a 8 rio added using 3 groups, 1 house 2-3 out buildings. I have noticed a few times if 1u 2s 3s and there is a mains fail groups 2-3 unset. Need to double check what happens when all are set and mains fail. The panel reports mains fail on G2-20 and P Rio. But why is the system unsetting the other 2 groups when mains fails both units have good batteries?