icematic n200m

hey guys! been a while since i posted anything. Got a problem whith a icemaker that keeps tripping the alarm. I have added some 404 a couple of times knowing it has a slow leak the alarm keeps tripping and it has to be reset in order to complete the cycle. Other time it goes for days whith out tripping the bin fills normally and stops on full bin. Then if its not checked every day it can stop and need to be reset again. Now everything seems to be working well compressor fans condenser clean pressures normal but i just can seem to put my finger on it! Any suggestions what to look for and any info you might need about the machine pls ask. Thanks!