Thanks for useful points.
Haven't tried checking with the TRV head removed - good idea - will do so on Friday, when it's due to get colder.
Already checked out the other things and reset the BPV to 1.0 bar. Re: the pump setting - boiler is Worccester-B Greenstar 30 CDI heat-only (kept the...
I would dearly like to hear from as many as possible, who have experienced similar problems to mine.
I have done lots of temperature measurements and adjustments, also swapping TRV heads around to compare. My conclusion is that these valves are just not up to the mark, in 2 unconnected ways...