This is not a request for the reasons behind the cranky mood. It is simply a statement that 'your mood is cranky'. It is intended to make the person aware of this crankiness.
The cause may be tiredness, a hangover, the time of the month (PMT), preoccupation with a problem, etc.

The code really signals: 'Are you aware that you are being difficult and cranky?'

It is difficult to have insight into your own moods unless they are extreme. The code is a friendly reminder of how you are behaving. It is not intended to be a condemnation.

'Mum's 8/14 this morning.' 'Towards the end of a holiday everyone gets a bit 8/14.'

There is some overlap with the mood code (code 10).