Hi All,
I have LG outdoor unit ARUN100LTE4 and one indoor unit- LG hydro kit ARNH10K2A2
all the time the compressor is working on 20-30Hz, that is not normal because set outlet water temp. is 50 deg.and actual temp. is 35. There is no problem with the compressor or some board, because after defrost cycle compressor is working on 140Hz and after 2-3min. again on 30Hz.
I tried with power reset, factory reset but no results, I checked all settings everything is by the book.Unit is working on system with fan coils and floor heating.

Any idea where should I look for the problem?

I didn't mention that unit is working without alarms.