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View Full Version : Code 23 and 21 in SB III SR



giath
02-11-2011, 08:38 AM
HI all
Could you please to lead me how can i fix this fault ( cooling cycle fault).
And how can diagnose the unit relay board.
thans alot in advanced

cadwaladr
02-11-2011, 07:53 PM
code 21 cooling cycle check ,code 23 cooling cycle fault and shutdown fault.is this unit fully charged what are the pressures and all the temperatures air on air off coil temperature and the ambient temperature,the unit may be iced etc we need more info to help you.