4 warning beeps?

about a minute after starting my 206sw from cold iget 4 warning beeps and then a cotinuous beep,the indicator flash unit only clicks 3 times then stops although the indicators still work and there is a lack of power in the engine.if the engine is turned off and left for appox. 2 minutes it stops doing it, although sometimes it happens when the engine is hot and at idle.any ideas please?