Thank you for your quick response. Because the set value is reached. What is confusing is that the circulating pump is constantly operating at 100%, has no modulation based on hysterize. One of the problems that occurs when the compressor works for oil recovery, during room heating, normally the compressor increases the power during oil recovery to 75% of operation, then the starting and return T ° increases, the control registers that the heat requirement has been reached, is it the return T ° reaches the switch off point and then the circulation pump is shut down and the oil return is not yet complete and the compressor is still running, there is an increase in T ° in the exchanger as well as pressure and a high pressure error occurs. Can any parameter be changed so that the circulation pump does not shut down when the oil is returned to the compressor? Another problem that occurs to me is when the DHW is heated, the circulation pump is too fast and if the exchanger in the boiler is 4m², this does not occur in normal T °, the circulation pump is running at maximum speed constantly, should it not modulate its power at based on the difference in T °? Best regards