Hi @Kate.
I think part of the answer to your “so what does that mean?” question may be found in Samsung Gen 6 R32 5kW + Sunamp Thermino (plenty of questions inside) - #8 by SarahH.
My comments at the time were aimed at a WRC roomstat (so #2093) but apply equally to a third party roomstat like yours (so #2091).
Happy to expand on this if you are still troubled…