With electronic digital control the electronics boards have built in self diagnostics programs, these monitor system operation and flash a code up if any malfunctions in these systems occur.
If you need a code then search the manufacturers website and you will find all the error codes and there meanings. Some basic codes may be found in your instruction manuals as well so might be worth reading.
Its always worth googling if you cannot find information on the manufacturers websites.
Treat codes as a guide as its rare they will pin point the exact fault but can often give you a direction to go in with your fault finding.
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