The panel indicates that defrost has started, but the contactor does not activate and the defrost does not work.
Check the connection of the safety thermostat.Make sure that you have correctly connected the safety thermostat in terminals 23 and 24.
If your facility does not have a safety thermostat, you must make a bridge between these terminals, if not, the defrost contactor will not activate.
I have connected the panel to a condensation unit with three phase hermetic compressor but it does not start.
If you do not have a thermistor relay you must bridge terminals 17 and 19.The hermetic compressors do not have a thermistor relay, therefore, you must make a bridge between terminals 17 and 19.