The ABV seems to have started working again, I ran the pump on c3 for a while and did a couple of air purge cycles which seemed to help, maybe had air in the system. The valve now has to be set quite low to open which also doesn't seem quite right though.I wouldn't go so far as to say they are no good but have seen very poor posts re their TRVs, if you have replaced it again with another Tower and it works, then fine.
Yes all rads with TRV heads off, Drayton valves were set at the index I calclated for a dT of 12 when I measured. I will probably reset them back to dT20 and see whether things have improved with the new pump. I've opened the valves up at the moment to let the F3 get around everything with less restriction.Are the readings above taken with all 15 rads "on" with the TRV heads removed?.
Now need to determine the best setting, PP with a 3.5m head seemed to work well and once the ABV sorted itself that seemed to be working as well, on the overun when the CH valve closed I could tweak the ABV to really trim the flow through it but not sure if PP mode will play well with the ABV, more experimenting required.
The pump seems fantastic, the 0.1m increment adjustments and flow indication are great.