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Originally Posted by The Ice Cap User Manual
Safety level sensor (PS) is a backup to shut off the feed pump in case of a malfunction. In this case a red LED will flash and an audible alarm can be heard.
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As to the why.. well.. it would seem that the first sensor failed to see that the water had reached the proper level and the water continued to rise until it tripped the PS safety sensor..
Now that could be from a failure in the ATO or potentially you have a siphon issue with your pump..
Is the ATO container water level higher than your sumps return section?
If so do you install the "siphon break" properly per the instructions?