Hi

just replaced 2 compressors on a REQ16P8 feeding 11 indoor units
run the system in heating and I知 getting liquid flooding back /low (0ｰC to 1ｰc) superheat on the suction line, this is coming back from the indoor units (suction line visibly freezing on the suction pipe within the roof space and at the suction service valves of the outdoor unit).
All the pipe work is not easily accessible.
in a couple of the rooms I can hear gas/liquid rushing through the indoor units even though they are switched off.

I have shut the system down as not happy leaving it running & risking the new compressors , I知 assuming the valves are leaking through in the BS boxes, could this be they are just not controlling and need resetting (how can I do this? Do I need to power down the indoor units and outdoor unit as well? or is it a common thing for these to leak by? I did power down the 2 BS boxes and turned them back

Thanks in advance
CB