TC 2290: Error 4 is shown when pressing the STORE key
Question Why do I get Error 4 when pressing the key
Your current setting cannot be stored simply by pressing the button. Error 4 means "Wrong store sequence". The correct sequence is to press: You can omit entering a number if you want to overwrite the current preset number. This "difficult store sequence" was done to prevent you from accidentially overwriting your presets.
Keywords: TC 2290: Error 4 is shown when pressing the STORE key