I manually drove open and re-fitted to stop refrigerant flow. - This wouldn't stop the refrigerant flow, how did you carry this out?

BS boxes stuck in Heating - Is the solenoid coils wired/installed correctly to relevant BS box?

I wouldn't expect defrost operation in June but the checker data will let you know if system enters defrost. Think you need a Daikin engineer to attend you may have a multitude of issues.