There are two types of codes that could be observed. The most common is the Long flashes for 'tens'.
Each code is made up of two series of flashes.
The long flashes indicate the 'tens' digits.
The short flashes indicate the 'ones' digits.
A long pause separates each code sequence.
Once every code has been displayed the code sequence repeats.
If no faults, only code 12 will be displayed.
Upper Code Format Diagram shows code No. 12.
Or...
Each code is made up of two series of flashes.
The first series indicates the 'tens' digit.
The second series indicates the 'ones' digit.
A long pause separates each code.
A shorter pause separates the 'tens' and 'ones'.
Lower Code Format Diagram shows code No. 32.