Those Samsung ASHP owners with access to the new FSVs like #1061 etc. (e.g. version 01 PCBs) may not appreciate that the default setting for FSV#6031 is "Yes” (or “on”), and that the description/explanation in the manual is not very precise (surprise…).
Following some unexpected/unfamiliar circuit operation after replacing my PCB with a v01, I saw - in 3 test runs out of 3 - that the controller was stopping the compressor if the required inverter frequency fell below 30Hz (previously, my HP - an 8kW HTQ - had operated happily down to 20Hz).
The Good Book states that this is an energy saving measure - and maybe it is (I haven’t run the economics yet) - but I worry that the additional stop/starts that occur as a result may be imposing extra stress on the compressor circuit (incl. inverter/motor/seals and other moving parts like EEVs/SOVs). I also had some strange DHW heating problems - like terminating tank heating before setpoint was reached - until I reset #6031 to “No” yesterday. Now everything (CH and DHW) is running as it was with the old PCB.
It may be worth annotating your manual with the above observations, and my thanks to UK Helpdesk for drawing my attention to this “new” FSV 
.