Date                  obvious
Time                  same
Version               Not sure, but think it is my firmware.  The latest has been loaded
BT1                   Outside temperature
BT1 Mean              don't know if mean is for the day or week or year.
BT2                   External flow temp
BT3                   External return temperature
BT10                  Incoming brine temp
BT11                  Brine return temperature
Calc Supply           don't know
GM                    don't know
Alarm                 I suppose if there were one it would be shown
Relays PCA Base       No idea
BT12                  Temperature sensor, condenser supply line
BT14                  Temperature sensor, hot gas
BT17                  Temperature sensor, suction gas
Total int add         I think this the pre-set amount of resistance heating which can be set.
Prio                  I think priority for hot water or heating, not sure
BT50                  don't know
BT 25                 External flow temperature. I have it on the side of the buffer cylinder and it is used in the degree minute calculations.