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Switch it on.
Select heat or cool or auto mode.
Select the correct temp to match the mode selected.
Clean the filters.
Clean any debris blocking the outdoor unit.
Turn on zone control (ducted units only).
Select high fan speed until room is at temperature.
Turn off power for 1 minute & try again
Allow defrost cycle to complete.
Unit is timing out on the anti cycle timer.
This will occur until sufficient heat has built up in the indoor unit to prevent cold drafts. It should then revert to the fan speed selected.
I would suggest that you clean the filter.
This is normal in heat mode, a drain can be fitted if you wish.